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Now showing items 1 - 16 of 42577

  • High precision measurement of Compton scattering in the 5 GeV region

    Ambrozewicz, P.   Ye, L.   Prok, Y.   Larin, I   Ahmidouch, A.   Baker, K.   Baturin, V   Benton, L.   Bernstein, A.   Burkert, V   Clinton, E.   Cole, P. L.   Collins, P.   Dale, D.   Danagoulian, S.   Davidenko, G.   Demirchyan, R.   Deur, A.   Dolgolenko, A.   Dutta, D.   Dzyubenko, G.   Evdokimov, A.   Fedotov, G.   Feng, J.   Gabrielyan, M.   Gan, L.   Gao, H.   Gasparian, A.   Gevorkyan, N.   Gevorkyan, S.   Glamazdin, A.   Goryachev, V   Guo, L.   Gyurjyan, V   Hardy, K.   He, J.   Isupov, E.   Ito, M. M.   Jiang, L.   Kang, H.   Kashy, D.   Khandaker, M.   Kingsberry, P.   Klein, F.   Kolarkar, A.   Konchatnyi, M.   Korchin, O.   Korsch, W.   Kosinov, O.   Kowalski, S.   Kubantsev, M.   Kubarovsky, A.   Kubarovsky, V   Lawrence, D.   Li, X.   Levillain, M.   Lu, H.   Ma, L.   Martel, P.   Matveev, V   McNulty, D.   Mecking, B.   Micherdzinska, A.   Milbrath, B.   Minehart, R.   Miskimen, R.   Mochalov, V   Morrison, B.   Mtingwa, S.   Nakagawa, I   Overby, S.   Pasyuk, E.   Payen, M.   Park, K.   Pedroni, R.   Phelps, W.   Protopopescu, D.   Rimal, D.   Ritchie, B. G.   Romanov, D.   Salgado, C.   Shahinyan, A.   Sitnikov, A.   Sober, D.   Stepanyan, S.   Stephens, W.   Tarasov, V   Taylor, S.   Teymurazyan, A.   Underwood, J.   Vasiliev, A.   Vishnyakov, V.   Weygand, D. P.   Wood, M.   Zhang, Y.   Zhou, S.   Zihlmann, B.  

    The cross section of atomic electron Compton scattering gamma + e -> gamma' + e' was measured in the 4.400-5.475 GeV photon beam energy region by the PrimEx collaboration at Jefferson Lab with an accuracy of 2.6% and less. The results are consistent with theoretical predictions that include next-to-leading order radiative corrections. The measurements provide the first high precision test of this elementary QED process at beam energies greater than 0.1 GeV. (C) 2019 The Author(s). Published by Elsevier B.V.
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  • Modified structure of protons and neutrons in correlated pairs

    Schmookler, B.   Duer, M.   Schmidt, A.   Hen, O.   Gilad, S.   Piasetzky, E.   Strikman, M.   Weinstein, L. B.   Adhikari, S.   Amaryan, M.   Ashkenazi, A.   Avakian, H.   Ball, J.   Balossino, I.   Barion, L.   Bashkanov, M.   Battaglieri, M.   Beck, A.   Bedlinskiy, I.   Biselli, A. S.   Boiarinov, S.   Briscoe, W. J.   Brooks, W. K.   Burkert, V. D.   Carman, D. S.   Celentano, A.   Charles, G.   Chetry, T.   Ciullo, G.   Cohen, E.   Cole, P. L.   Crede, V.   Cruz-Torres, R.   D'Angelo, A.   Dashyan, N.   De Sanctis, E.   De Vita, R.   Deur, A.   Diehl, S.   Djalali, C.   Dupre, R.   Egiyan, H.   El Fassi, L.   Elouadrhiri, L.   Eugenio, P.   Fedotov, G.   Fersch, R.   Filippi, A.   Forest, T. A.   Gavalian, G.   Gilfoyle, G. P.   Girod, F. X.   Golovatch, E.   Gothe, R. W.   Griffioen, K. A.   Guidal, M.   Guo, L.   Hafidi, K.   Hakobyan, H.   Hanretty, C.   Harrison, N.   Hauenstein, F.   Hayward, T. B.   Hicks, K.   Higinbotham, D.   Holtrop, M.   Hyde, C. E.   Ilieva, Y.   Ireland, D. G.   Ishkhanov, B. S.   Isupov, E. L.   Jo, H. -S.   Johnston, S.   Joo, K.   Joosten, S.   Kabir, M. L.   Keller, D.   Khachatryan, G.   Khachatryan, M.   Khandaker, M.   Kim, A.   Kim, W.   Klein, A.   Klein, F. J.   Korover, I.   Kubarovsky, V.   Kuhn, S. E.   Kuleshov, S. V.   Lanza, L.   Laskaris, G.   Lenisa, P.   Livingston, K.   MacGregor, I. J. D.   Markov, N.   McKinnon, B.   Beck, S. Mey-Tal   Mineeva, T.   Mirazita, M.   Mokeev, V.   Montgomery, R. A.   Camacho, C. Munoz   Mustapha, B.   Niccolai, S.   Osipenko, M.   Ostrovidov, A. I.   Paolone, M.   Paremuzyan, R.   Park, K.   Pasyuk, E.   Patsyuk, M.   Pogorelko, O.   Price, J. W.   Prok, Y.   Protopopescu, D.   Ripani, M.   Riser, D.   Rizzo, A.   Rosner, G.   Rossi, P.   Sabatie, F.   Salgado, C.   Schumacher, R. A.   Segarra, E. P.   Sharabian, G.   Skorodumina, I. U.   Sokhan, D.   Sparveris, N.   Stepanyan, S.   Strauch, S.   Taiuti, M.   Tan, J. A.   Ungaro, M.   Voskanyan, H.   Voutier, E.   Watts, D. P.   Wei, X.   Wood, M.   Zachariou, N.   Zhang, J.   Zhao, Z. W.   Zheng, X.  

    The atomic nucleus is made of protons and neutrons (nucleons), which are themselves composed of quarks and gluons. Understanding how the quark-gluon structure of a nucleon bound in an atomic nucleus is modified by the surrounding nucleons is an outstanding challenge. Although evidence for such modification-known as the EMC effect-was first observed over 35 years ago, there is still no generally accepted explanation for its cause(1-3). Recent observations suggest that the EMC effect is related to close-proximity short-range correlated (SRC) nucleon pairs in nuclei(4,5). Here we report simultaneous, high-precision measurements of the EMC effect and SRC abundances. We show that EMC data can be explained by a universal modification of the structure of nucleons in neutron-proton SRC pairs and present a data-driven extraction of the corresponding universal modification function. This implies that in heavier nuclei with many more neutrons than protons, each proton is more likely than each neutron to belong to an SRC pair and hence to have distorted quark structure. This universal modification function will be useful for determining the structure of the free neutron and thereby testing quantum chromodynamics symmetry-breaking mechanisms and may help to discriminate between nuclear physics effects and beyond-the-standard-model effects in neutrino experiments.
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  • photoproduction from threshold to

    Goetz, J. T.   Hicks, K.   Kunkel, M. C.   Price, J. W.   Weygand, D. P.   Adhikari, S.   Anefalos Pereira, S.   Battaglieri, M.   Bedlinskiy, I.   Biselli, A. S.   Boiarinov, S.   Bookwalter, C.   Briscoe, W. J.   Brooks, W. K.   Burkert, V. D.   Cao, F.   Carman, D. S.   Celentano, A.   Chandavar, S.   Chatagnon, P.   Chetry, T.   Ciullo, G.   Cole, P. L.   Contalbrigo, M.   Crede, V.   D'Angelo, A.   Dashyan, N.   De Vita, R.   Defurne, M.   Deur, A.   Diehl, S.   Djalali, C.   Dugger, M.   Dupre, R.   Egiyan, H.   Ehrhart, M.   El Alaoui, A.   El Fassi, L.   Elouadrhiri, L.   Eugenio, P.   Fedotov, G.   Filippi, A.   Gevorgyan, N.   Ghandilyan, Y.   Girod, F. X.   Glazier, D. I.   Golovatch, E.   Gothe, R. W.   Griffioen, K. A.   Guidal, M.   Guo, L.   Hafidi, K.   Hakobyan, H.   Harrison, N.   Hattawy, M.   Heddle, D.   Holtrop, M.   Ireland, D. G.   Ishkhanov, B. S.   Isupov, E. L.   Jo, H. S.   Joosten, S.   Kabir, M. L.   Keller, D.   Khachatryan, G.   Khachatryan, M.   Khandaker, M.   Kim, A.   Kim, W.   Klein, F. J.   Kubarovsky, V.   Lanza, L.   Livingston, K.   MacGregor, I. J. D.   McKinnon, B.   Meyer, C. A.   Mirazita, M.   Mokeev, V.   Movsisyan, A.   Munoz Camacho, C.   Nadel-Turonski, P.   Niccolai, S.   Niculescu, G.   Osipenko, M.   Ostrovidov, A. I.   Paolone, M.   Paremuzyan, R.   Park, K.   Pasyuk, E.   Pogorelko, O.   Prok, Y.   Protopopescu, D.   Raue, B. A.   Ripani, M.   Riser, D.   Rizzo, A.   Rosner, G.   Sabatié, F.   Saini, M. S.   Salgado, C.   Schott, D.   Schumacher, R. A.   Sharabian, Y. G.   Skorodumina, Iu.   Sober, D. I.   Sokhan, D.   Sparveris, N.   Strakovsky, I. I.   Strauch, S.   Taiuti, M.   Tan, J. A.   Ungaro, M.   Voskanyan, H.   Voutier, E.   Wang, R.   Wei, X.   Wood, M. H.   Zachariou, N.   Zhang, J.   Zhao, Z. W.  

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  • Photon beam asymmetry Sigma for eta and eta ' photoproduction from the proton

    Collins, P.   Ritchie, B. G.   Dugger, M.   Anisovich, A. V.   Doering, M.   Klempt, E.   Nikonov, V. A.   Roenchen, D.   Sadasivan, D.   Sarantsev, A.   Adhikari, K. P.   Akbar, Z.   Amaryan, M. J.   Pereira, S. Anefalos   Avakian, H.   Ball, J.   Balossino, I.   Bashkanov, M.   Battaglieri, M.   Bedlinskiy, I.   Biselli, A. S.   Briscoe, W. J.   Brooks, W. K.   Burkert, V. D.   Cao, Frank Thanh   Carman, D. S.   Celentano, A.   Chandavar, S.   Charles, G.   Chetry, T.   Ciullo, G.   Clark, L.   Colaneri, L.   Cole, P. L.   Compton, N.   Contalbrigo, M.   Cortes, O.   Crede, V.   D'Angelo, A.   Dashyan, N.   De Vita, R.   De Sanctis, E.   Deur, A.   Djalali, C.   Dupre, R.   Egiyan, H.   El Alaoui, A.   El Fassi, L.   Elouadrhiri, L.   Eugenio, P.   Fanchini, E.   Fedotov, G.   Filippi, A.   Fleming, J. A.   Ghandilyan, Y.   Gilfoyle, G. P.   Giovanetti, K. L.   Girod, F. X.   Glazier, D. I.   Gleason, C.   Golovatch, E.   Gothe, R. W.   Griffioen, K. A.   Guo, L.   Hafidi, K.   Hakobyan, H.   Hanretty, C.   Harrison, N.   Heddle, D.   Hicks, K.   Holtrop, M.   Hughes, S. M.   Ilieva, Y.   Ireland, D. G.   Ishkhanov, B. S.   Isupov, E. L.   Jenkins, D.   Jo, H. S.   Joosten, S.   Keller, D.   Khachatryan, G.   Khachatryan, M.   Khandaker, M.   Kim, A.   Kim, W.   Klein, A.   Klein, F. J.   Kubarovsky, V.   Lanza, L.   Lenisa, P.   Livingston, K.   MacGregor, I. J. D.   Markov, N.   McKinnon, B.   Meyer, C. A.   Mirazita, M.   Mokeev, V.   Montgomery, R. A.   Movsisyan, A.   Camacho, C. Munoz   Murdoch, G.   Nadel-Turonski, P.   Niccolai, S.   Niculescu, G.   Niculescu, I.   Osipenko, M.   Ostrovidov, A. I.   Paolone, M.   Paremuzyan, R.   Park, K.   Pasyuk, E.   Phelps, W.   Pisano, S.   Pogorelko, O.   Price, J. W.   Prok, Y.   Protopopescu, D.   Raue, B. A.   Ripani, M.   Rizzo, A.   Rosner, G.   Roy, P.   Sabatie, F.   Salgado, C.   Schumacher, R. A.   Sharabian, Y. G.   Skorodumina, Iu.   Smith, G. D.   Sokhan, D.   Sparveris, N.   Stepanyan, S.   Strakovsky, I. I.   Strauch, S.   Taiuti, M.   Tian, Ye   Torayev, B.   Ungaro, M.   Voskanyan, H.   Voutier, E.   Walford, N. K.   Wei, X.   Zachariou, N.   Zhang, J.  

    Measurements of the linearly-polarized photon beam asymmetry Sigma for photoproduction from the proton of eta and eta ' mesons are reported. A linearly-polarized tagged photon beam produced by coherent bremsstrahlung was incident on a cryogenic hydrogen target within the CEBAF Large Acceptance Spectrometer. Results are presented for the gamma p -> eta p reaction for incident photon energies from 1.070 to 1.876 GeV, and from 1.516 to 1.836 GeV for the gamma p -> eta ' p reaction. For gamma p -> eta p, the data reported here considerably extend the range of measurements to higher energies, and are consistent with the few previously published measurements for this observable near threshold. For gamma p -> eta ' p, the results obtained are consistent with the few previously published measurements for this observable near threshold, but also greatly expand the incident photon energy coverage for that reaction. Initial analysis of the data reported here with the Bonn-Gatchina model strengthens the evidence for four nucleon resonances - the N(1895)1/2(-), N(1900)3/2(+), N(2100)1/2(+) and N(2120)3/2(-) resonances which presently lack the "four-star" status in the current Particle Data Group compilation, providing examples of how these new measurements help refine models of the photoproduction process. (C) 2017 The Authors. Published by Elsevier B.V.
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  • STUDIES OF NUCLEON RESONANCE STRUCTURE IN EXCLUSIVE MESON ELECTROPRODUCTION

    Aznauryan, I. G.   Bashir, A.   Braun, V. M.   Brodsky, S. J.   Burkert, V. D.   Chang, L.   Chen, Ch   El-Bennich, B.   Cloet, I. C.   Cole, P. L.   Edwards, R. G.   Fedotov, G. V.   Giannini, M. M.   Gothe, R. W.   Gross, F.   Lin, Huey-Wen   Kroll, P.   Lee, T. -S. H.   Melnitchouk, W.   Mokeev, V. I.   Pena, M. T.   Ramalho, G.   Roberts, C. D.   Santopinto, E.   de Teramond, G. F.   Tsushima, K.   Wilson, D. J.  

    Studies of the structure of excited baryons are key factors to the N* program at Jefferson Lab (JLab). Within the first year of data taking with the Hall B CLAS12 detector following the 12 GeV upgrade, a dedicated experiment will aim to extract the N* electrocouplings at high photon virtualities Q(2). This experiment will allow exploration of the structure of N* resonances at the highest photon virtualities ever achieved, with a kinematic reach up to Q(2) = 12 GeV2. This high-Q(2) reach will make it possible to probe the excited nucleon structures at distance scales ranging from where effective degrees of freedom, such as constituent quarks, are dominant through the transition to where nearly massless bare-quark degrees of freedom are relevant. In this document, we present a detailed description of the physics that can be addressed through N* structure studies in exclusive meson electroproduction. The discussion includes recent advances in reaction theory for extracting N* electrocouplings from meson electroproduction off protons, along with Quantum Chromodynamics (QCD)-based approaches to the theoretical interpretation of these fundamental quantities. This program will afford access to the dynamics of the nonperturbative strong interaction responsible for resonance formation, and will be crucial in understanding the nature of confinement and dynamical chiral symmetry breaking in baryons, and how excited nucleons emerge from QCD.
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  • Measurement of nuclear transparency ratios for protons and neutrons

    Duer, M.   Hen, O.   Piasetzky, E.   Weinstein, L. B.   Schmidt, A.   Korover, I   Cohen, E. O.   Hakobyan, H.   Adhikari, S.   Angelini, G.   Avakian, H.   Gayoso, C. Ayerbe   Barion, L.   Battaglieri, M.   Beck, A.   Bedlinskiy, I   Biselli, A. S.   Boiarinov, S.   Briscoe, W. J.   Brooks, W.   Burkert, V. D.   Cao, F.   Carman, D. S.   Celentano, A.   Chatagnon, P.   Chetry, T.   Ciullo, G.   Cole, P. L.   Contalbrigo, M.   Cortes, O.   Crede, V   Torres, R. Cruz   D'Angelo, A.   Dashyan, N.   De Vita, R.   De Sanctis, E.   Deur, A.   Diehl, S.   Djalali, C.   Dupre, R.   Duran, Burcu   Egiyan, H.   Ehrhart, M.   El Alaoui, A.   El Fassi, L.   Eugenio, P.   Filippi, A.   Forest, T. A.   Gilfoyle, G. P.   Girod, F. X.   Golovatch, E.   Gothe, R. W.   Griffioen, K. A.   Guidal, M.   Guo, L.   Hafidi, K.   Hanretty, C.   Harrison, N.   Hattawy, M.   Hauenstein, F.   Hayward, T. B.   Heddle, D.   Holtrop, M.   Ilievaa, Y.   Ireland, D. G.   Ishkhanov, B. S.   Isupov, E. L.   Jo, H. S.   Johnston, S.   Joo, K.   Joosten, S.   Keller, D.   Khachatryan, G.   Khachatryan, M.   Khanal, A.   Khandaker, M.   Kim, A.   Kim, W.   Klein, A.   Klein, F. J.   Kubarovsky, V   Kuhn, S. E.   Kuleshov, S., V   Lanza, L.   Laskaris, G.   Lenisa, P.   Livingston, K.   MacGregor, I. J. D.   Marchand, D.   McKinnon, B.   Beck, S. Mey-Tal   Mineeva, T.   Mirazita, M.   Mokeev, V   Montgomery, R. A.   Movsisyan, A.   Camacho, C. Munoz   Mustapha, B.   Nadel-Turonski, P.   Niccolai, S.   Niculescu, G.   Osipenko, M.   Ostrovidov, A., I   Paolone, M.   Pappalardo, L. L.   Paremuzyan, R.   Pasyuk, E.   Patsyuk, M.   Payette, D.   Price, J.   Pocanic, D.   Pogorelko, O.   Prok, Y.   Protopopescu, D.   Raue, B. A.   Ripani, M.   Riser, D.   Rizzo, A.   Rosner, G.   Rossi, P.   Sabatie, F.   Salgado, C.   Schmookler, B. A.   Schumacher, R. A.   Segarra, E. P.   Sharabian, Y. G.   Skorodumina, Iu   Sokhan, D.   Soto, O.   Sparveris, N.   Stepanyan, S.   Strauch, S.   Taiuti, M.   Tan, J. A.   Ungaro, M.   Voskanyan, H.   Voutier, E.   Wang, R.   Wei, X.   Zachariou, N.   Zhang, J.   Zhao, Z. W.   Zheng, X.  

    This paper presents, for the first time, measurements of neutron transparency ratios for nuclei relative to C measured using the (e, e'n) reaction, spanning measured neutron momenta of 1.4 to 2.4 GeV/c. The transparency ratios were extracted in two kinematical regions, corresponding to knockout of mean-field nucleons and to the breakup of Short-Range Correlated nucleon pairs. The extracted neutron transparency ratios are consistent with each other for the two measured kinematical regions and agree with the proton transparencies extracted from new and previous (e, e'p) measurements, including those from neutron-rich nuclei such as lead. The data also agree with and confirm the Glauber approximation that is commonly used to interpret experimental data. The nuclear-mass-dependence of the extracted transparencies scales as A(alpha) with alpha =3D -0.289 +/- 0.007, which is consistent with nuclear-surface dominance of the reactions. (C) 2019 The Author. Published by Elsevier B.V.
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  • Photofission of Actinides with Linearly Polarized Photons

    Dale, D. S.   Bodily, R.   Cole, P. L.   Conn, A.   Forest, T. A.   Kelley, K.   Kosinov, O.   Setiniyaz, S.   Shapovlov, R.   Starovoitova, V.   Swanson, J.  

    Idaho State University and the Idaho Accelerator Center are developing a polarized photon facility in the 10 MeV region using the off axis bremsstrahlung technique. Initial tests have been performed with the aim of using the high analyzing power of the photodisintegration of the deuteron to measure the beam polarization. A program is currently underway to measure the potential angular asymmetries of neutrons arising from the angular distribution of the fission fragments from photofission with linearly polarized photons. In this paper, we describe the Idaho State University Polarized Photon Facility, present results of commissioning runs, and describe potential application of polarized photofission in detecting actinides for homeland security and safeguards applications.
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  • Measurement of transparency ratios for protons from short-range correlated pairs

    Hen, O.   Hakobyan, H.   Shneor, R.   Piasetzky, E.   Weinstein, L. B.   Brooks, W. K.   Beck, S. May-Tal   Gilad, S.   Korover, I.   Beck, A.   Adhikari, K. P.   Aghasyan, M.   Amaryan, M. J.   Pereira, S. Anefalos   Arrington, J. R.   Baghdasaryan, H.   Ball, J.   Battaglieri, M.   Batourine, V.   Bedlinskiy, I.   Biselli, A. S.   Bono, J.   Boiarinov, S.   Briscoe, W. J.   Burkert, V. D.   Carman, D. S.   Celentano, A.   Chandavar, S.   Cole, P. L.   Contalbrigo, M.   Crede, V.   D'Angelo, A.   Dashyan, N.   De Vita, R.   De Sanctis, E.   Deur, A.   Djalali, C.   Dodge, G. E.   Doughty, D.   Dupre, R.   Egiyan, H.   El Alaoui, A.   El Fassi, L.   Eugenio, P.   Fedotov, G.   Fegan, S.   Fleming, J. A.   Gabrielyan, M. Y.   Gevorgyan, N.   Gilfoyle, G. P.   Giovanetti, K. L.   Girod, F. X.   Goetz, J. T.   Gohn, W.   Golovatch, E.   Gothe, R. W.   Griffioen, K. A.   Guo, L.   Hafidi, K.   Harrison, N.   Heddle, D.   Hicks, K.   Holtrop, M.   Hyde, C. E.   Ilieva, Y.   Ireland, D. G.   Ishkhanov, B. S.   Isupov, E. L.   Jo, H. S.   Joo, K.   Keller, D.   Khandaker, M.   Khetarpal, P.   Kim, A.   Klein, F. J.   Koirala, S.   Kubarovsky, A.   Kubarovsky, V.   Kuhn, S. E.   Livingston, K.   Lu, H. Y.   MacGregor, I. J. D.   Martinez, D.   Mayer, M.   McKinnon, B.   Mineeva, T.   Mokeev, V.   Montgomery, R. A.   Moutarde, H.   Munevar, E.   Camacho, C. Munoz   Mustapha, B.   Nadel-Turonski, P.   Nasseripour, R.   Niccolai, S.   Niculescu, G.   Niculescu, I.   Osipenko, M.   Ostrovidov, A. I.   Pappalardo, L. L.   Paremuzyan, R.   Park, K.   Park, S.   Pasyuk, E.   Phelps, E.   Phillips, J. J.   Pisano, S.   Pivnyuk, N.   Pogorelko, O.   Pozdniakov, S.   Price, J. W.   Procureur, S.   Protopopescu, D.   Puckett, A. J. R.   Raue, B. A.   Rimal, D.   Ripani, M.   Ritchie, B. G.   Rosner, G.   Rossi, P.   Sabatie, F.   Saini, M. S.   Schott, D.   Schumacher, R. A.   Seraydaryan, H.   Sharabian, Y. G.   Smith, G. D.   Sober, D. I.   Sokhan, D.   Stepanyan, S. S.   Stepanyan, S.   Strauch, S.   Taiuti, M.   Tang, W.   Taylor, C. E.   Tian, Ye   Tkachenko, S.   Ungaro, M.   Vernarsky, B.   Vlassov, A.   Voskanyan, H.   Voutier, E.   Walford, N. K.   Watts, D. P.   Wood, M. H.   Zachariou, N.   Zana, L.   Zhang, J.   Zheng, X.   Zonta, I.  

    Nuclear transparency, T-p(A), is a measure of the average probability for a struck proton to escape the nucleus without significant re-interaction. Previously, nuclear transparencies were extracted for quasi-elastic A(e, e' p) knockout of protons with momentum below the Fermi momentum, where the spectral functions are well known. In this Letter we extract a novel observable, the transparency ratio, T-p(A)/T-p(C-12), for knockout of high-missing-momentum protons from the breakup of short-range correlated pairs (2N-SRC) in Al, Fe and Pb nuclei relative to C. The ratios were measured at momentum transfer Q(2) >= 1.5 (GeV/c)(2) and x(B) >= 1.2 where the reaction is expected to be dominated by electron scattering from 2N-SRC. The transparency ratios of the knocked-out protons coming from 2N-SRC breakup are 20-30% lower than those of previous results for low missing momentum. They agree with Glauber calculations and agree with renormalization of the previously published transparencies as proposed by recent theoretical investigations. The new transparencies scale as A(-1/3), which is consistent with dominance of scattering from nucleons at the nuclear surface. (C) 2013 Elsevier B.V. All rights reserved.
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  • Exclusive rho(0) electroproduction on the proton at CLAS RID E-8618-2010

    Morrow, S. A.   Guidal, M.   Garcon, M.   Laget, J. M.   Smith, E. S.   Adams, G.   Adhikari, K. P.   Aghasyan, M.   Amaryan, M. J.   Anghinolfi, M.   Asryan, G.   Audit, G.   Avakian, H.   Bagdasaryan, H.   Baillie, N.   Ball, J. P.   Baltzell, N. A.   Barrow, S.   Battaglieri, M.   Bedlinskiy, I.   Bektasoglu, M.   Bellis, M.   Benmouna, N.   Berman, B. L.   Biselli, A. S.   Blaszczyk, L.   Bonner, B. E.   Bookwalter, C.   Bouchigny, S.   Boiarinov, S.   Bradford, R.   Branford, D.   Briscoe, W. J.   Brooks, W. K.   Bueltmann, S.   Burkert, V. D.   Butuceanu, C.   Calarco, J. R.   Careccia, S. L.   Carman, D. S.   Carnahan, B.   Casey, L.   Cazes, A.   Chen, S.   Cheng, L.   Cole, P. L.   Collins, P.   Coltharp, P.   Cords, D.   Corvisiero, P.   Crabb, D.   Crannell, H.   Crede, V.   Cummings, J. P.   Dale, D.   Dashyan, N.   De Masi, R.   De Vita, R.   De Sanctis, E.   Degtyarenko, P. V.   Denizli, H.   Dennis, L.   Deur, A.   Dhamija, S.   Dharmawardane, K. V.   Dhuga, K. S.   Dickson, R.   Didelez, J. -P.   Djalali, C.   Dodge, G. E.   Doughty, D.   Dugger, M.   Dytman, S.   Dzyubak, O. P.   Egiyan, H.   Egiyan, K. S.   El Fassi, L.   Elouadrhiri, L.   Eugenio, P.   Fatemi, R.   Fedotov, G.   Fersch, R.   Feuerbach, R. J.   Forest, T. A.   Fradi, A.   Gavalian, G.   Gevorgyan, N.   Gilfoyle, G. P.   Giovanetti, K. L.   Girod, F. X.   Goetz, J. T.   Gohn, W.   Gordon, C. I. O.   Gothe, R. W.   Graham, L.   Griffioen, K. A.   Guillo, M.   Guler, N.   Guo, L.   Gyurjyan, V.   Hadjidakis, C.   Hafidi, K.   Hakobyan, H.   Hanretty, C.   Hardie, J.   Hassall, N.   Heddle, D.   Hersman, F. W.   Hicks, K.   Hleiqawi, I.   Holtrop, M.   Hourany, E.   Hyde-Wright, C. E.   Ilieva, Y.   Ireland, D. G.   Ishkhanov, B. S.   Isupov, E. L.   Ito, M. M.   Jenkins, D.   Jo, H. S.   Johnstone, J. R.   Joo, K.   Juengst, H. G.   Kalantarians, N.   Keller, D.   Kellie, J. D.   Khandaker, M.   Khetarpal, P.   Kim, W.   Klein, A.   Klein, F. J.   Klimenko, A. V.   Kossov, M.   Kramer, L. H.   Kubarovsky, V.   Kuhn, J.   Kuhn, S. E.   Kuleshov, S. V.   Kuznetsov, V.   Lachniet, J.   Langheinrich, J.   Lawrence, D.   Li, Ji   Livingston, K.   Lu, H. Y.   MacCormick, M.   Marchand, C.   Markov, N.   Mattione, P.   McAleer, S.   McCracken, M.   McKinnon, B.   McNabb, J. W. C.   Mecking, B. A.   Mehrabyan, S.   Melone, J. J.   Mestayer, M. D.   Meyer, C. A.   Mibe, T.   Mikhailov, K.   Minehart, R.   Mirazita, M.   Miskimen, R.   Mokeev, V.   Morand, L.   Moreno, B.   Moriya, K.   Moteabbed, M.   Mueller, J.   Munevar, E.   Mutchler, G. S.   Nadel-Turonski, P.   Nasseripour, R.   Niccolai, S.   Niculescu, G.   Niculescu, I.   Niczyporuk, B. B.   Niroula, M. R.   Niyazov, R. A.   Nozar, M.   O'Rielly, G. V.   Osipenko, M.   Ostrovidov, A. I.   Park, K.   Park, S.   Pasyuk, E.   Paterson, C.   Pereira, S. Anefalos   Philips, S. A.   Pierce, J.   Pivnyuk, N.   Pocanic, D.   Pogorelko, O.   Polli, E.   Popa, I.   Pozdniakov, S.   Preedom, B. M.   Price, J. W.   Procureur, S.   Prok, Y.   Protopopescu, D.   Qin, L. M.   Raue, B. A.   Riccardi, G.   Ricco, G.   Ripani, M.   Ritchie, B. G.   Rosner, G.   Rossi, P.   Rubin, P. D.   Sabatie, F.   Saini, M. S.   Salamanca, J.   Salgado, C.   Santoro, J. P.   Sapunenko, V.   Schott, D.   Schumacher, R. A.   Serov, V. S.   Sharabian, Y. G.   Sharov, D.   Shvedunov, N. V.   Skabelin, A. V.   Smith, L. C.   Sober, D. I.   Sokhan, D.   Stavinsky, A.   Stepanyan, S. S.   Stepanyan, S.   Stokes, B. E.   Stoler, P.   Strakovsky, I. I.   Strauch, S.   Taiuti, M.   Tedeschi, D. J.   Tkabladze, A.   Tkachenko, S.   Todor, L.   Tur, C.   Ungaro, M.   Vineyard, M. F.   Vlassov, A. V.   Watts, D. P.   Weinstein, L. B.   Weygand, D. P.   Williams, M.   Wolin, E.   Wood, M. H.   Yegneswaran, A.   Yurov, M.   Zana, L.   Zhang, J.   Zhao, B.   Zhao, Z. W.  

    The ep -> e'pp(0) reaction has been measured using the 5.754 GeV electron beam of Jefferson Lab and the CLAS detector. This represents the largest ever set of data for this reaction in the valence region. Integrated and differential cross-sections are presented. The W, Q(2) and t dependences of the cross-section are compared to theoretical calculations based on the t-channel meson-exchange Regge theory, on the one hand, and on quark handbag diagrams related to Generalized Parton Distributions (GPDs) on the other hand. The Regge approach can describe at the approximate to 30% level most of the features of the present data while the two GPD calculations that are presented in this article which succesfully reproduce the high-energy data strongly underestimate the present data. The question is then raised whether this discrepancy originates from an incomplete or inexact way of modelling the GPDs or the associated hard scattering amplitude or whether the GPD formalism is simply inapplicable in this region due to higher-twists contributions, incalculable at present.
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  • Evidence for the onset of color transparency in rho(0) electroproduction off nuclei

    El Fassi, L.   Zana, L.   Hafidi, K.   Holtrop, M.   Mustapha, B.   Brooks, W. K.   Hakobyan, H.   Zheng, X.   Adhikari, K. P.   Adikaram, D.   Aghasyan, M.   Amaryan, M. J.   Anghinolfi, M.   Arrington, J.   Avakian, H.   Baghdasaryan, H.   Battaglieri, M.   Batourine, V.   Bedlinskiy, I.   Biselli, A. S.   Bookwalter, C.   Branford, D.   Briscoe, W. J.   Bueltmann, S.   Burkert, V. D.   Carman, D. S.   Celentano, A.   Chandavar, S.   Cole, P. L.   Contalbrigo, M.   Crede, V.   D'Angelo, A.   Daniel, A.   Dashyan, N.   De Vita, R.   De Sanctis, E.   Deur, A.   Dey, B.   Dickson, R.   Djalali, C.   Dodge, G. E.   Doughty, D.   Dupre, R.   Egiyan, H.   El Alaoui, A.   Elouadrhiri, L.   Eugenio, P.   Fedotov, G.   Fegan, S.   Gabrielyan, M. Y.   Garcon, M.   Gevorgyan, N.   Gilfoyle, G. P.   Giovanetti, K. L.   Girod, F. X.   Goetz, J. T.   Gohn, W.   Golovatch, E.   Gothe, R. W.   Griffioen, K. A.   Guidal, M.   Guo, L.   Hanretty, C.   Heddle, D.   Hicks, K.   Holt, R. J.   Hyde, C. E.   Ilieva, Y.   Ireland, D. G.   Ishkhanov, B. S.   Isupov, E. L.   Jawalkar, S. S.   Keller, D.   Khandaker, M.   Khetarpal, P.   Kim, A.   Kim, W.   Klein, A.   Klein, F. J.   Kubarovsky, V.   Kuhn, S. E.   Kuleshov, S. V.   Kuznetsov, V.   Laget, J. M.   Lu, H. Y.   MacGregor, I. J. D.   Mao, Y.   Markov, N.   Mayer, M.   McAndrew, J.   McKinnon, B.   Meyer, C. A.   Mineeva, T.   Mirazita, M.   Mokeev, V.   Moreno, B.   Moutarde, H.   Munevar, E.   Nadel-Turonski, P.   Ni, A.   Niccolai, S.   Niculescu, G.   Niculescu, I.   Osipenkov, M.   Ostrovidov, A. I.   Pappalardo, L. L.   Paremuzyan, R.   Park, K.   Park, S.   Pasyuk, E.   Pereira, S. Anefalos   Phelps, E.   Pozdniakov, S.   Price, J. W.   Procureur, S.   Protopopescu, D.   Raue, B. A.   Reimer, P. E.   Ricco, G.   Rimal, D.   Ripani, M.   Ritchie, B. G.   Rosner, G.   Rossi, P.   Sabatie, F.   Saini, M. S.   Salgado, C.   Schott, D.   Schumacher, R. A.   Seraydaryan, H.   Sharabian, Y. G.   Smith, E. S.   Smith, G. D.   Sober, D. I.   Sokhan, D.   Stepanyan, S. S.   Stepanyan, S.   Stoler, P.   Strauch, S.   Taiuti, M.   Tang, W.   Taylor, C. E.   Tedeschi, D. J.   Tkachenko, S.   Ungaro, M.   Vernarsky, B.   Vineyard, M. F.   Voskanyan, H.   Voutier, E.   Watts, D.   Weinstein, L. B.   Weygand, D. P.   Wood, M. H.   Zachariou, N.   Zhao, B.   Zhao, Z. W.  

    We have measured the nuclear transparency of the incoherent diffractive A(e,e' rho(0)) process in C-12 and Fe-56 targets relative to H-2 using a 5 GeV electron beam. The nuclear transparency, the ratio of the produced rho(0,)s on a nucleus relative to deuterium, which is sensitive to rho A interaction, was studied as function of the coherence length (l(c)), a lifetime of the hadronic fluctuation of the virtual photon, and the four-momentum transfer squared (Q(2)). While the transparency for both C-12 and Fe-56 showed no lc dependence, a significant Q(2) dependence was measured, which is consistent with calculations that included the color transparency effects. (C) 2012 Elsevier B.V. All rights reserved.
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  • First results on nucleon resonance photocouplings from the gamma p -> pi(+)pi(-) p reaction

    Golovatch, E.   Burkert, V. D.   Carman, D. S.   Gothe, R. W.   Hicks, K.   Ishkhanov, B. S.   Mokeev, V. I.   Pasyuk, E.   Adhikari, S.   Akbar, Z.   Amaryan, M. J.   Avakian, H.   Ball, J.   Barion, L.   Bashkanov, M.   Battaglieri, M.   Bedlinskiy, I.   Biselli, A. S.   Boiarinov, S.   Briscoe, W. J.   Cao, F.   Celentano, A.   Chatagnon, P.   Chetry, T.   Ciullo, G.   Clark, L.   Clary, B. A.   Cole, P. L.   Contalbrigo, M.   Crede, V.   D'Angelo, A.   Dashyan, N.   DeVita, R.   DeSanctis, E.   Defurne, M.   Deur, A.   Diehl, S.   Djalali, C.   Dugger, M.   Dupre, R.   Egiyan, H.   Ehrhart, M.   ElAlaoui, A.   ElFassi, L.   Elouadrhiri, L.   Eugenio, P.   Fedotov, G.   Fersch, R.   Filippi, A.   Ghandilyan, Y.   Gilfoyle, G. P.   Giovanetti, K. L.   Girod, F. X.   Glazier, D. I.   Griffioen, K. A.   Guidal, M.   Guo, L.   Hafidi, K.   Hakobyan, H.   Harrison, N.   Hattawy, M.   Heddle, D.   Holtrop, M.   Ilieva, Y.   Ireland, D. G.   Isupov, E. L.   Jenkins, D.   Jo, H. S.   Johnston, S.   Joo, K.   Kabir, M. L.   Keller, D.   Khachatryan, G.   Khachatryan, M.   Khandaker, M.   Kim, W.   Klein, A.   Klein, F. J.   Kubarovsky, V.   Lanza, L.   Lenisa, P.   Livingston, K.   MacGregor, I. J. D.   Marchand, D.   Markov, N.   McKinnon, B.   Meyer, C. A.   Montgomery, R. A.   Movsisyan, A.   Munoz Camacho, C.   Nadel-Turonski, P.   Niccolai, S.   Niculescu, G.   Osipenko, M.   Ostrovidov, A. I.   Paolone, M.   Paremuzyan, R.   Park, K.   Pogorelko, O.   Price, J. W.   Prok, Y.   Protopopescu, D.   Ripani, M.   Riser, D.   Rizzo, A.   Rosner, G.   Sabatie, F.   Salgado, C.   Schumacher, R. A.   Sharabian, Y. G.   Skorodumina, Iu.   Smith, G. D.   Sober, D. I.   Sokhan, D.   Sparveris, N.   Strakovsky, I. I.   Strauch, S.   Taiuti, M.   Tan, J. A.   Tyler, N.   Ungaro, M.   Voskanyan, H.   Voutier, E.   Wang, R.   Wei, X.   Wood, M. H.   Zachariou, N.   Zhang, J.   Zhao, Z. W.  

    We report the first experimental measurements of the nine 1-fold differential cross sections for the gamma p ->pi(+)pi(-) p reaction, obtained with the CLAS detector at Jefferson Laboratory. The measurements cover the invariant mass range of the final state hadrons from 1.6 GeV < W < 2.0 GeV. For the first time the photocouplings of all prominent nucleon resonances in this mass range have been extracted from this exclusive channel. Photoproduction of two charged pions is of particular importance for the evaluation of the photocouplings for the Delta(1620)1/2(-) , Delta(1700)3/2(-) , N(1720)3/2(+), and Delta(1905)5/2(+) resonances, which have dominant decays into the pi pi N final states rather than the more extensively studied single meson decay channels. (C) 2018 The Author. Published by Elsevier B.V.
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  • Near-threshold photoproduction of phi mesons from deuterium RID G-2589-2011 RID E-8618-2010

    Qian, X.   Chen, W.   Gao, H.   Hicks, K.   Kramer, K.   Laget, J. M.   Mibe, T.   Qiang, Y.   Stepanyan, S.   Tedeschi, D. J.   Xu, W.   Adhikari, K. P.   Amaryan, M.   Anghinolfi, M.   Ball, J.   Battaglieri, M.   Batourine, V.   Bedlinskiy, I.   Bellis, M.   Biselli, A. S.   Bookwalter, C.   Branford, D.   Briscoe, W. J.   Brooks, W. K.   Burkert, V. D.   Careccia, S. L.   Carman, D. S.   Cole, P. L.   Collins, P.   Crede, V.   D'Angelo, A.   Daniel, A.   Dashyan, N.   De Vita, R.   De Sanctis, E.   Deur, A.   Dey, B.   Dhamija, S.   Djalali, C.   Doughty, D.   Dupre, R.   Egiyan, H.   El Alaoui, A.   Eugenio, P.   Fegan, S.   Gabrielyan, M. Y.   Gevorgyan, N.   Gilfoyle, G. P.   Giovanetti, K. L.   Girod, F. X.   Goetz, J. T.   Gohn, W.   Gothe, R. W.   Graham, L.   Griffioen, K. A.   Guidal, M.   Guo, L.   Hafidi, K.   Hakobyan, H.   Hanretty, C.   Hassall, N.   Holtrop, M.   Ilieva, Y.   Ireland, D. G.   Jawalkar, S. S.   Jo, H. S.   Joo, K.   Keller, D.   Khandaker, M.   Khetarpal, P.   Kim, A.   Kim, W.   Klein, A.   Klein, F. J.   Konczykowski, P.   Kubarovsky, V.   Kuleshov, S. V.   Kuznetsov, V.   Livingston, K.   Martinez, D.   Mayer, M.   McAndrew, J.   McCracken, M. E.   McKinnon, B.   Meyer, C. A.   Mikhailov, K.   Mineeva, T.   Mirazita, M.   Mokeev, V.   Moreno, B.   Moriya, K.   Morrison, B.   Moutarde, H.   Munevar, E.   Nadel-Turonski, P.   Ni, A.   Niccolai, S.   Niculescu, I.   Niroula, M. R.   Osipenko, M.   Ostrovidov, A. I.   Paremuzyan, R.   Park, K.   Park, S.   Pereira, S. Anefalos   Pisano, S.   Pogorelko, O.   Pozdniakov, S.   Price, J. W.   Procureu, S.   Protopopescu, D.   Ricco, G.   Ripani, M.   Ritchie, B. G.   Rosner, G.   Rossi, P.   Sabatie, F.   Saini, M. S.   Salgado, C.   Schott, D.   Schumacher, R. A.   Seder, E.   Seraydaryan, H.   Sharabian, Y. G.   Smith, E. S.   Smith, G. D.   Sober, D. I.   Sokhan, D.   Stepanyan, S. S.   Stoler, P.   Strakovsky, I. I.   Strauch, S.   Taiuti, M.   Taylor, C. E.   Tkachenko, S.   Ungaro, M.   Vernarsky, B.   Vineyard, M. F.   Voutier, E.   Weinstein, L. B.   Weygand, D. P.   Wood, M. H.   Zachariou, N.   Zana, L.   Zhang, J.   Zhao, B.   Zhao, Z. W.  

    We report the first, kinematically-complete measurement of the differential cross section of phi-meson photoproduction from deuterium near the production threshold for a proton using the CLAS detector and a tagged-photon beam in Hall B at Jefferson Lab. The measurement was carried out by a triple coincidence detection of a proton, K+ and K- near the theoretical production threshold of 1.57 GeV. The extracted differential cross sections d sigma/dt for the initial photon energy range of 1.65-1.75 GeV are consistent with predictions based on a quasifree mechanism. Our finding is different from recent LEPS results on phi-meson photoproduction from deuterium in a similar incident photon energy range, but in a different momentum transfer region. (C) 2011 Elsevier B.V. All rights reserved.
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  • Semi-inclusive pi(0) target and beam-target asymmetries from 6 GeV electron scattering with CLAS

    Jawalkar, S.   Koirala, S.   Avakian, H.   Bosted, P.   Griffioen, K. A.   Keith, C.   Kuhn, S. E.   Adhikari, K. P.   Adhikari, S.   Adikaram, D.   Akbar, Z.   Amaryan, M. J.   Pereira, S. Anefalos   Ball, J.   Baltzell, N. A.   Battaglieri, M.   Batourine, V.   Bedlinskiy, I.   Biselli, A. S.   Boiarinov, S.   Briscoe, W. J.   Brock, J.   Brooks, W. K.   Bultmann, S.   Burkert, V. D.   Cao, Frank Thanh   Carlin, C.   Carman, D. S.   Celentano, A.   Charles, G.   Chetry, T.   Ciullo, G.   Clark, L.   Colaneri, L.   Cole, P. L.   Contalbrigo, M.   Cortes, O.   Crede, V.   D'Angelo, A.   Dashyan, N.   De Vita, R.   De Sanctis, E.   Defurne, M.   Deur, A.   Djalali, C.   Ddoge, G.   Dupre, R.   Egiyan, H.   El Alaoui, A.   El Fassi, L.   Elouadrhiri, L.   Eugenio, P.   Fedotov, G.   Fegan, S.   Fersch, R.   Filippi, A.   Fleming, J. A.   Forest, T. A.   Fradi, A.   Garcon, M.   Ghandilyan, Y.   Gilfoyle, G. P.   Giovanetti, K. L.   Girod, F. X.   Gleason, C.   Gohn, W.   Golovatch, E.   Gothe, R. W.   Guidal, M.   Guler, N.   Guo, L.   Hakobyan, H.   Hanretty, C.   Harrison, N.   Hattawy, M.   Heddle, D.   Hicks, K.   Hollis, G.   Holtrop, M.   Hughes, S. M.   Ilieva, Y.   Ireland, D. G.   Ishkhanov, B. S.   Isupov, E. L.   Jenkins, D.   Jiang, H.   Joo, K.   Joosten, S.   Keller, D.   Khachatryan, G.   Khachatryan, M.   Khandaker, M.   Kim, A.   Kim, W.   Klein, A.   Klein, F. J.   Kubarovsky, V.   Kuleshov, S. V.   Lanza, L.   Lenisa, P.   Livingston, K.   Lu, H. Y.   MacGregor, I. J. D.   Markov, N.   Mayer, M.   McCracken, M. E.   McKinnon, B.   Meyer, C. A.   Mineeva, T.   Mirazita, M.   Mokeev, V.   Montgomery, R. A.   Movsisyan, A.   Camacho, C. Munoz   Nadel-Turonski, P.   Net, L. A.   Niccolai, S.   Niculescu, G.   Niculescu, I.   Osipenko, M.   Ostrovidov, A. I.   Paremuzyan, R.   Park, K.   Pasyuk, E.   Phelps, E.   Phelps, W.   Pierce, J.   Pisano, S.   Pogorelko, O.   Price, J. W.   Prok, Y.   Protopopescu, D.   Raue, B. A.   Ripani, M.   Riser, D.   Rizzo, A.   Rosner, G.   Rossi, P.   Sabatie, F.   Salgado, C.   Schumacher, R. A.   Seder, E.   Sharabian, Y. G.   Simonyan, A.   Skorodumina, Iu.   Smith, G. D.   Sober, D. I.   Sokhan, D.   Sparveris, N.   Stankovic, I.   Strauch, S.   Taiuti, M.   Ungaro, M.   Voskanyan, H.   Voutier, E.   Walford, N. K.   Watts, D. P.   Wei, X.   Weinstein, L. B.   Wood, M. H.   Zachariou, N.   Zhang, J.   Zhao, Z. W.  

    We present precision measurements of the target and beam-target spin asymmetries from neutral pion electroproduction in deep-inelastic scattering (DIS) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. We scattered 6-GeV, longitudinally polarized electrons off longitudinally polarized protons in a cryogenic (14)NH(3)target, and extracted double and single target spin asymmetries for ep -> e'pi(0)Xin multidimensional bins in four-momentum transfer (1.0 < Q(2) < 3.2GeV(2)), Bjorken-x(0.12 < x < 0.48), hadron energy fraction (0.4 < z < 0.7), transverse pion momentum (0 < P-T < 1.0GeV), and azimuthal angel phi(h) between the lepton scattering and hadron production planes. We extracted asymmetries as a function of both xand P-T, which provide access to transverse-momentum distributions of longitudinally polarized quarks. The double spin asymmetries depend weakly on P-T. The sin2 phi(h) moments are zero within uncertainties, which is consistent with the expected suppression of the Collins fragmentation function. The observed sin phi(h) moments suggest that quark gluon correlations are significant at large x. (C) 2018 The Authors. Published by Elsevier B.V.
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  • Measurement of the nuclear multiplicity ratio for K(s)(0) hadronization at CLAS RID D-4072-2011

    Daniel, A.   Hicks, K.   Brooks, W. K.   Hakobyan, H.   Adhikari, K. P.   Adikaram, D.   Aghasyan, M.   Amarian, M.   Anghinolfi, M.   Avakian, H.   Baghdasaryan, H.   Battaglieri, M.   Batourine, V.   Bedlinskiy, I.   Bennett, R. P.   Biselli, A. S.   Bookwalter, C.   Briscoe, W. J.   Burkert, V. D.   Carman, D. S.   Casey, L.   Celentano, A.   Chandavar, S.   Cole, P. L.   Contalbrigo, M.   Crede, V.   D'Angelo, A.   Dashyan, N.   De Vita, R.   De Sanctis, E.   Deur, A.   Dey, B.   Dickson, R.   Djalali, C.   Dodge, G. E.   Doughty, D.   Egiyan, H.   El Fassi, L.   Elouadrhiri, L.   Eugenio, P.   Fedotov, G.   Fegan, S.   Gabrielyan, M. Y.   Gevorgyan, N.   Gilfoyle, G. P.   Giovanetti, K. L.   Girod, F. X.   Goetz, J. T.   Gohn, W.   Golovatch, E.   Gothe, R. W.   Griffioen, K. A.   Guidal, M.   Guo, L.   Hanretty, C.   Heddle, D.   Holtrop, M.   Hyde, C. E.   Ilieva, Y.   Ireland, D. G.   Ishkhanov, B. S.   Isupov, E. L.   Jawalkar, S. S.   Jo, H. S.   Joo, K.   Kalantarians, N.   Keller, D.   Khandaker, M.   Khetarpal, P.   Kim, A.   Kim, W.   Klein, A.   Klein, F. J.   Kubarovsky, V.   Kuleshov, S. V.   Kuznetsov, V.   Lu, N. Y.   MacGregor, I. J. D.   Mao, Y.   Markov, N.   Mayer, M.   McAndrew, J.   McKinnon, B.   Meyer, C. A.   Mineeva, T.   Mirazita, M.   Mokeev, V.   Moutarde, H.   Munevar, E.   Nadel-Turonski, P.   Ni, A.   Niccolai, S.   Niculescu, G.   Niculescu, I.   Osipenko, M.   Ostrovidov, A. I.   Paolone, M.   Pappalardo, L.   Paremuzyan, R.   Park, K.   Park, S.   Pasyuk, E.   Pereira, S. Anefalos   Phelps, E.   Pisano, S.   Pogorelko, O.   Pozdniakov, S.   Price, J. W.   Procureur, S.   Protopopescu, D.   Raue, B. A.   Ricco, G.   Rimal, D.   Ripani, M.   Rosner, G.   Rossi, P.   Sabatie, F.   Saini, M. S.   Salgado, C.   Schott, D.   Schumacher, R. A.   Seraydaryan, H.   Sharabian, Y. G.   Smith, G. D.   Sober, D. I.   Sokhan, D.   Stepanyan, S. S.   Stepanyan, S.   Strauch, S.   Taiuti, M.   Tang, W.   Taylor, C. E.   Tkachenko, S.   Ungaro, M.   Vernarsky, B.   Vineyard, M. F.   Voskanyan, H.   Voutier, E.   Watts, D. P.   Weinstein, L. B.   Weygand, D. P.   Wood, M. H.   Zana, L.   Zachariou, N.   Zhao, B.   Zhao, Z. W.  

    The influence of cold nuclear matter on lepto-production of hadrons in semi-inclusive deep inelastic scattering is measured using the CLAS detector in Hall B at Jefferson Lab and a 5.014 GeV electron beam. We report the K(s)(0) multiplicity ratios for targets of C, Fe, and Pb relative to deuterium as a function of the fractional virtual photon energy z transferred to the K(s)(0) and the transverse momentum squared p(T)(2). of the K(s)(0). We find that the multiplicity ratios for K(s)(0) are reduced in the nuclear medium at high z and low p(T)(2), with a trend for the K(s)(0) momentum to be broadened in the nucleus for large p(T)(2). (C) 2011 Elsevier B.V. All rights reserved.
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  • Polarization observables from the photoproduction of omega-mesons using linearly polarized photons

    Martinez, D.   Cole, P. L.  

    We report on the photon beam asymmetry, Sigma, of the omega meson decaying into pi(+), pi(-), pi(0) using a beam of linearly polarized photons in the photon energy region of E-gamma = 1.9 GeV. These preliminary results are from the summer 2005 g8b dataset, which were collected with the CLAS detector in Hall B of Jefferson Lab.
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  • Traumatic Brain Injury and the Americans with Disabilities Act: Implications for the Social Work Profession

    Cole, P. L.   Cecka, D. M.  

    The practice of social work has been greatly affected by the Americans with Disabilities Act of 1990 (ADA). Title I of the statute prohibits discrimination against people with disabilities, including the increasing number of workers who are returning to work after a traumatic brain injury (TBI). This article examines the extent to which the ADA protects those with TBI from being harassed, being denied reasonable workplace accommodations, or suffering other adverse actions related to perceived discrimination. To do so, it relies on judicial decisions from U.S. federal courts involving alleged workplace discrimination of this population. Implications for social work practice are noted with the intent of increasing ADA awareness among professionals providing services to people who meet the criteria for disability under the ADA as well as to those persons who do not. The authors hope to encourage social workers to rely on case law analysis as a mechanism to provide further evidence of the systematic problems faced by people with TBI and thus increase their visibility.
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