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Now showing items 17 - 19 of 19

  • Heavy Photon Search Experiment at JLAB

    Stepanyan, S.  

    The Heavy Photon Search (HPS) experiment in Hall-B at Jefferson Lab will search for new heavy vector boson(s), aka "heavy photons", in the mass range of 20 MeV/c(2) to 1000 MeV/c(2) using the scattering of high energy, high intensity electron beams off a high Z target. The proposed measurements will cover the region of parameter space favored by the mum g-2 anomaly, and will explore a significant region of parameter space, not only at large couplings (alpha'/alpha > 10(-7)), but also in the regions of small couplings, down to alpha'/alpha similar to 10(-10). The excellent vertexing capability of the Si-tracker uniquely enables HPS to cover the small coupling region. Also, HPS will search for heavy photons in an alternative to the e(+)e(-) decay mode, in the heavy photon's decay to mu(+) mu(-).
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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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  • Photon beam asymmetry Sigma in the reaction <(gamma)over right arrow> -> p omega for E-gamma=3D1.152 to 1.876 GeV

    Collins, P.   Ritchie, B. G.   Dugger, M.   Klein, F. J.   Anisovich, A. V.   Klempt, E.   Nikonov, V. A.   Sarantsev, A.   Adhikari, K. P.   Adhikari, S.   Adikaram, D.   Akbar, Z.   Pereira, S. Anefalos   Avakian, H.   Ball, J.   Baltzell, N. A.   Bashkanov, M.   Battaglieri, M.   Batourine, V.   Bedlinskiy, I.   Biselli, A. S.   Boiarinov, S.   Briscoe, W. J.   Brooks, W. K.   Burkert, V. D.   Cao, Frank Thanh   Cao, T.   Carman, D. S.   Celentano, A.   Charles, G.   Chetry, T.   Ciullo, G.   Clark, L.   Cole, P. L.   Contalbrigo, M.   Cortes, O.   Crede, V.   Dashyan, N.   De Vita, R.   De Sanctis, E.   Defurne, M.   Deur, A.   Djalali, C.   Dupre, R.   Egiyan, H.   El Alaoui, A.   El Fassi, L.   Eugenio, P.   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.   Guidal, M.   Hafidi, K.   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.   Jo, H. S.   Joosten, S.   Keller, D.   Khachatryan, G.   Khachatryan, M.   Khandaker, M.   Kim, A.   Kim, W.   Klein, A.   Kubarovsky, V.   Kuleshov, S. V.   Lanza, L.   Lenisa, P.   Livingston, K.   MacGregor, I. J. D.   Markov, N.   McKinnon, B.   Meyer, C. A.   Meziani, Z. E.   Mineeva, T.   Mokeev, V.   Montgomery, R. A.   Movsisyan, A.   Munevar, E.   Camacho, C. Munoz   Nadel-Turonski, P.   Net, L. A.   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.   Procureur, S.   Prok, Y.   Protopopescu, D.   Raue, B. A.   Ripani, M.   Rizzo, A.   Rosner, G.   Sabatie, F.   Salgado, C.   Schumacher, R. A.   Sharabian, Y. G.   Simonyan, A.   Skorodumina, Iu.   Smith, G. D.   Sober, D. I.   Sokhan, D.   Sparveris, N.   Stankovic, I.   Stepanyan, S.   Strakovsky, I. I.   Strauch, S.   Taiuti, M.   Ungaro, M.   Voskanyan, H.   Voutier, E.   Walford, N. K.   Watts, D. P.   Wei, X.   Wood, M. H.   Zachariou, N.   Zhang, J.   Zhao, Z. W.  

    Photon beam asymmetry Sigma measurements for omega photoproduction in the reaction gamma (gamma) over right arrow p -> omega p are reported for photon energies from 1.152 to 1.876 GeV. Data were taken using a linearly-polarized tagged photon beam, a cryogenic hydrogen target, and the CLAS spectrometer in Hall B at Jefferson Lab. The measurements obtained markedly increase the size of the database for this observable, extend coverage to higher energies, and resolve discrepancies in previously published data. Comparisons of these new results with predictions from a chiral-quark-based model and from a dynamical coupled-channels model indicate the importance of interferences between t-channel meson exchange and s- and u-channel contributions, underscoring sensitivity to the nucleon resonances included in those descriptions. Comparisons with the Bonn-Gatchina partial-wave analysis indicate the Sigma data reported here help to fix the magnitudes of the interference terms between the leading amplitudes in that calculation (Pomeron exchange and the resonant portion of the J(P)=3D 3/2(+) partial wave), as well as the resonant portions of the smaller partial waves with J(P)=3D 1/2(-), 3/2(-), and 5/2(+). (C) 2017 The Author(s). Published by Elsevier B.V.
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