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Now showing items 1 - 8 of 8

  • 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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  • in kaon electroproduction

    Gabrielyan, M.   Raue, B. A.   Carman, D. S.   Park, K.   Adhikari, K. P.   Adikaram, D.   Amaryan, M. J.   Anefalos Pereira, S.   Avakian, H.   Ball, J.   Baltzell, N. A.   Battaglieri, M.   Baturin, V.   Bedlinskiy, I.   Biselli, A. S.   Bono, J.   Boiarinov, S.   Briscoe, W. J.   Brooks, W. K.   Burkert, V. D.   Cao, T.   Celentano, A.   Chandavar, S.   Charles, G.   Colaneri, L.   Cole, P. L.   Contalbrigo, M.   Cortes, O.   Crede, V.   D\"Angelo, A.   Dashyan, N.   De Vita, R.   De Sanctis, E.   Deur, A.   Djalali, C.   Doughty, D.   Dupre, R.   El Fassi, L.   Eugenio, P.   Fedotov, G.   Fegan, S.   Fleming, J. A.   Forest, T. A.   Garillon, B.   Gevorgyan, N.   Ghandilyan, Y.   Gilfoyle, G. P.   Giovanetti, K. L.   Girod, F. X.   Goetz, J. T.   Golovatch, E.   Gothe, R. W.   Griffioen, K. A.   Guidal, M.   Guo, L.   Hafidi, K.   Hakobyan, H.   Hattawy, M.   Hicks, K.   Ho, D.   Holtrop, M.   Hughes, S. M.   Ilieva, Y.   Ireland, D. G.   Ishkhanov, B. S.   Jenkins, D.   Jiang, H.   Jo, H. S.   Joo, K.   Keller, D.   Khandaker, M.   Kim, W.   Klein, F. J.   Koirala, S.   Kubarovsky, V.   Kuhn, S. E.   Kuleshov, S. V.   Lenisa, P.   Levine, W. I.   Livingston, K.   MacGregor, I. J. D.   Mayer, M.   McKinnon, B.   Meyer, C. A.   Mestayer, M. D.   Mirazita, M.   Mokeev, V.   Moody, C. I.   Moutarde, H.   Movsisyan, A.   Munevar, E.   Munoz Camacho, C.   Nadel-Turonski, P.   Niccolai, S.   Niculescu, G.   Osipenko, M.   Pappalardo, L. L.   Paremuzyan, R.   Pasyuk, E.   Peng, P.   Phelps, W.   Phillips, J. J.   Pisano, S.   Pogorelko, O.   Pozdniakov, S.   Price, J. W.   Procureur, S.   Protopopescu, D.   Rimal, D.   Ripani, M.   Rizzo, A.   Sabatié, F.   Salgado, C.   Schott, D.   Schumacher, R. A.   Simonyan, A.   Smith, G. D.   Sober, D. I.   Sokhan, D.   Stepanyan, S. S.   Stepanyan, S.   Strakovsky, I. I.   Strauch, S.   Sytnik, V.   Tang, W.   Ungaro, M.   Vlassov, A. V.   Voskanyan, H.   Voutier, E.   Walford, N. K.   Watts, D. P.   Wei, X.   Weinstein, L. B.   Zachariou, N.   Zana, L.   Zhang, J.   Zonta, I.  

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  • Search for Sterile Neutrinos in MINOS and MINOS+ Using a Two-Detector Fit

    Adamson, P.   Anghel, I.   Aurisano, A.   Barr, G.   Bishai, M.   Blake, A.   Bock, G. J.   Bogert, D.   Cao, S. V.   Carroll, T. J.   Castromonte, C. M.   Chen, R.   Childress, S.   Coelho, J. A. B.   Corwin, L.   Cronin-Hennessy, D.   de Jong, J. K.   De Rijck, S.   Devan, A. V.   Devenish, N. E.   Diwan, M. V.   Escobar, C. O.   Evans, J. J.   Falk, E.   Feldman, G. J.   Flanagan, W.   Frohne, M. V.   Gabrielyan, M.   Gallagher, H. R.   Germani, S.   Gomes, R. A.   Goodman, M. C.   Gouffon, P.   Graf, N.   Gran, R.   Grzelak, K.   Habig, A.   Hahn, S. R.   Hartnell, J.   Hatcher, R.   Holin, A.   Huang, J.   Hylen, J.   Irwin, G. M.   Isvan, Z.   James, C.   Jensen, D.   Kafka, T.   Kasahara, S. M. S.   Koerner, L. W.   Koizumi, G.   Kordosky, M.   Kreymer, A.   Lang, K.   Ling, J.   Litchfield, P. J.   Lucas, P.   Mann, W. A.   Marshak, M. L.   Mayer, N.   McGivern, C.   Medeiros, M. M.   Mehdiyev, R.   Meier, J. R.   Messier, M. D.   Miller, W. H.   Mishra, S. R.   Moed Sher, S.   Moore, C. D.   Mualem, L.   Musser, J.   Naples, D.   Nelson, J. K.   Newman, H. B.   Nichol, R. J.   Nowak, J. A.   O’Connor, J.   Orchanian, M.   Pahlka, R. B.   Paley, J.   Patterson, R. B.   Pawloski, G.   Perch, A.   Pfützner, M. M.   Phan, D. D.   Phan-Budd, S.   Plunkett, R. K.   Poonthottathil, N.   Qiu, X.   Radovic, A.   Rebel, B.   Rosenfeld, C.   Rubin, H. A.   Sail, P.   Sanchez, M. C.   Schneps, J.   Schreckenberger, A.   Schreiner, P.   Sharma, R.   Sousa, A.   Tagg, N.   Talaga, R. L.   Thomas, J.   Thomson, M. A.   Tian, X.   Timmons, A.   Todd, J.   Tognini, S. C.   Toner, R.   Torretta, D.   Tzanakos, G.   Urheim, J.   Vahle, P.   Viren, B.   Weber, A.   Webb, R. C.   White, C.   Whitehead, L. H.   Wojcicki, S. G.   Zwaska, R.  

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  • MEASUREMENT OF THE INDUCED Lambda(0)(1116) POLARIZATION IN K+ ELECTROPRODUCTION at CLAS

    Gabrielyan, M.   Raue, B.   Carman, D. S.   Park, K.  

    We are using the p(e, e' K+ p)pi(-) reaction to perform a measurement of the induced polarization of the electroproduced L (1116) using its p pi(-) parity-violating weak decay. This study uses the CEBAF Large Acceptance Spectrometer (CLAS) to detect the scattered electron, the kaon, and the decay proton over the kinematics 0.8 <= Q(2) <= 3.5 GeV2, 1.6 <= W <= 3.0 GeV, and the full kaon CM angle range. In this experiment a 5.5 GeV electron beam was incident upon an unpolarized liquid-hydrogen target. The goal is to map out the kinematic dependencies for this polarization observable to provide new constraints for models of the electromagnetic production of K-hyperon final states. Along with previously published photo-and electroproduction cross sections and polarization observables from CLAS, SAPHIR, LEPS, and GRAAL, these data are needed in a coupled-channel analysis to identify previously unobserved s-channel resonances. Preliminary polarization results will be presented.
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  • Nuclear targets for a precision measurement of the neutral pion radiative width

    Martel, P.   Clinton, E.   McWilliams, R.   Lawrence, D.   Miskimen, R.   Ahmidouch, A.   Ambrozewicz, P.   Asratyan, A.   Baker, K.   Benton, L.   Bernstein, A.   Cole, P.   Collins, P.   Dale, D.   Danagoulian, S.   Davidenko, G.   Demirchyan, R.   Deur, A.   Dolgolenko, A.   Dzyubenko, G.   Evdokimov, A.   Feng, J.   Gabrielyan, M.   Gan, L.   Gasparian, A.   Glamazdin, O.   Goryachev, V.   Gyurjyan, V.   Hardy, K.   Ito, M.   Khandaker, M.   Kingsberry, P.   Kolarkar, A.   Konchatnyi, M.   Korchin, O.   Korsch, W.   Kowalski, S.   Kubantsev, M.   Kubarovsky, V.   Larin, I.   Matveev, V.   McNulty, D.   Milbrath, B.   Minehart, R.   Mochalov, V.   Mtingwa, S.   Nakagawa, I.   Overby, S.   Pasyuk, E.   Payen, M.   Pedroni, R.   Prok, Y.   Ritchie, B.   Salgado, C.   Sitnikov, A.   Sober, D.   Stephens, W.   Teymurazyan, A.   Underwood, J.   Vasiliev, A.   Verebryusov, V.   Vishnyakov, V.   Wood, M.  

    A technique is presented for precision measurements of the area densities, rho T, of approximately 5% radiation length carbon and (208)Pb targets used in an experiment at Jefferson Laboratory to measure the neutral pion radiative width. The precision obtained in the area density for the carbon target is +/- 0.050%, and that obtained for the lead target through an X-ray attenuation technique is +/- 0.43%. (C) 2009 Elsevier B.V. All rights reserved.
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  • Energy calibration of the JLab bremsstrahlung tagging system

    Stepanyan, S.   Boyarinov, S.   Egiyan, H.   Guo, L.   Dale, D.   Gabrielyan, M.   Gan, L.   Gasparian, A.   Glamazdin, A.   Mecking, B.   Nakagawa, I.   Teymurazyan, A.   Wood, M. H.  

    In this report, we present the energy calibration of the Hall B bremsstrahlung tagging system at the Thomas Jefferson National Accelerator Facility. The calibration was performed using a magnetic pair spectrometer. The tagged photon energy spectrum was measured in coincidence with e(+)e(-) pairs as a function of the pair spectrometer magnetic field. Taking advantage of the internal linearity of the pair spectrometer, the energy of the tagging system was calibrated at the level of +/- 0.1%E. The absolute energy scale was determined using the e+e- rate measurements close to the end-point of the photon spectrum. The energy variations across the full tagging range were found to be < 3 MeV. (c) 2007 Elsevier B.V. All rights reserved.
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  • Spectroscopic investigation of Lambda hypernuclei in the wide mass region using the (e,e'K(+)) reaction

    Nakamura, Satoshi N.   Achenbach, P.   Ahmidouch, A.   Albayrak, I.   Androic, D.   Asaturyan, A.   Asaturyan, R.   Ates, O.   Badui, R.   Baturin, P.   Boeglin, W.   Bono, J.   Bosted, P.   Brash, E.   Carter, P.   Chen, C.   Chiba, A.   Christy, M.   Dalton, M.   Danagoulian, S.   De Leo, R.   Doi, D.   Egiyan, K.   Elaasar, M.   Ent, R.   Fenker, H.   Fujii, Y.   Furic, M.   Gabrielyan, M.   Gan, L.   Garibaldi, F.   Gaskell, D.   Gasparian, A.   Gogami, T.   Hashimoto, O.   Horn, T.   Hu, B.   Jones, M.   Kanda, H.   Kaneta, M.   Kato, S.   Kawai, M.   Kawama, D.   Khanal, H.   Kohl, M.   Liyanage, A.   Luo, W.   Mack, D.   Maeda, K.   Margaryan, A.   Marikyan, G.   Markowitz, P.   Maruta, T.   Matsumura, A.   Maxwell, V.   Mkrtchyan, A.   Mkrtchyan, H.   Nagao, S.   Nakamura, S. N.   Narayan, A.   Navasardyan, T.   Neville, C.   Niculescu, G.   Niculescu, M. -I.   Nunez, A.   Nuruzzaman   Okayasu, Y.   Petkovic, T.   Pochodzalla, J.   Qiu, X.   Reinhold, J.   Rodriguez, V.   Samanta, C.   Sawatzky, B.   Schott, D.   Seva, T.   Shichijo, A.   Smith, G.   Tadevosyan, V.   Tamura, H.   Tang, L.   Taniya, N.   Tvaskis, V.   Veilleux, M.   Vulcan, W.   Wesselmann, F. R.   Wood, S. A.   Yamamoto, T.   Ya, L.   Ye, Z.   Yokota, K.   Yuan, L.   Zhamkochyan, S.   Zhu, L.  

    The third generation spectroscopic study of Lambda hypernuclei using (e,e'K(+)) reaction (JLab E05-115) was performed at JLab Hall-C in 2009. The experiment introduced the newly developed high-resolution electron spectrometer (HES) with the existing high-resolution kaon spectrometer (HKS). Experimental configuration, conditions, spectrometer designs and current status of analysis are presented.
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  • AIP Conference Proceedings [AIP THE 8TH INTERNATIONAL WORKSHOP ON THE PHYSICS OF EXCITED NUCLEONS: NSTAR 2011 - Newport News, VA, USA (17–20 May 2011)] - Measurement of the induced Λ0(1116) polarization in K+ electroproduction at CLAS

    Gabrielyan, M.   Raue, B.   Carman, D. S.   Park, K.   CLAS Collaboration,  

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