/ Experiment-HEP arXiv:1007.0777


Study of the $\gamma p -> \eta p$ reaction with the Crystal Ball detector at the Mainz Microtron(MAMI-C)


McNicoll, E.F. (Glasgow U.) ; Prakhov, S. (UCLA) ; Strakovsky, I.I. (George Washington U.) ; Aguar-Bartolome, P. (Mainz U.) ; Akasoy, L.K. (Mainz U.) ; Annand, J.R.M. (Glasgow U.) ; Arends, H.J. (Mainz U.) ; Arndt, R.A. (George Washington U.) ; Azimov, Ya.I. (St. Petersburg, INP) ; Bantawa, K. (Kent State U.) ; Beck, R. (Bonn U.) ; Bekrenev, V.S. (St. Petersburg, INP) ; Berghauser, H. (Giessen U.) ; Braghieri, A. (INFN, Pavia) ; Branford, D. (Edinburgh U.) ; Briscoe, W.J. (George Washington U.) ; Brudvik, J. (UCLA) ; Cherepnya, S. (Lebedev Inst.) ; Codling, R.F.B. (Glasgow U.) ; Demissie, B.T. (George Washington U.) ; Downie, E.J. (George Washington U.) ; Drexler, P. (Giessen U.) ; Fil'kov, L.V. (Lebedev Inst.) ; Fix, A. (Tomsk Polytechnic U.) ; Freehart, B. (George Washington U.) ; Glazier, D.I. (Edinburgh U.) ; Gregor, R. (Giessen U.) ; Hamilton, D. (Glasgow U.) ; Heid, E. (Mainz U.) ; Hornidge, D. (Mt. Allison U.) ; Jaegle, I. (Basel U.) ; Jahn, O. (Mainz U.) ; Jude, T.C. (Edinburgh U.) ; Kashevarov, V.L. (Lebedev Inst.) ; Kellie, J.D. (Glasgow U.) ; Keshelashvili, I. (Basel U.) ; Kondratiev, R. (Dubna, JINR) ; Korolija, M. (Boskovic Inst., Zagreb) ; Kotulla, M. (Giessen U.) ; Koulbardis, A.A. (St. Petersburg, INP) ; Kruglov, S.P. (St. Petersburg, INP) ; Krusche, B. (Basel U.) ; Lisin, V. (Dubna, JINR) ; Livingston, K. (Glasgow U.) ; MacGregor, I.J.D. (Glasgow U.) ; Maghrbi, Y. (Basel U.) ; Manley, D.M. (Kent State U.) ; Marinides, Z. (George Washington U.) ; Martinez, M. (Mainz U.) ; McGeorge, J.C. (Glasgow U.) ; McKinnon, B. (Glasgow U.) ; Mekterovic, D. (Boskovic Inst., Zagreb) ; Metag, V. (Giessen U.) ; Micanovic, S. (Boskovic Inst., Zagreb) ; Middleton, D. (Mt. Allison U.) ; Mushkarenkov, A. (INFN, Pavia) ; Nefkens, B.M.K. (UCLA) ; Nikolaev, A. (Bonn U.) ; Novotny, R. (Giessen U.) ; Ostrick, M. (Mainz U.) ; Otte, P.B. (Mainz U.) ; Oussena, B. (Mainz U.) ; Paris, M.W. (George Washington U.) ; Pedroni, P. (INFN, Pavia) ; Pheron, F. (Basel U.) ; Polonski, A. (Dubna, JINR) ; Robinson, J. (Glasgow U.) ; Rosner, G. (Glasgow U.) ; Rostomyan, T. (INFN, Pavia) ; Schumann, S. (Mainz U.) ; Sikora, M.H. (Edinburgh U.) ; Sober, D.I. (Catholic U.) ; Starostin, A. (UCLA) ; Suarez, I.M. (UCLA) ; Supek, I. (Boskovic Inst., Zagreb) ; Thiel, M. (Giessen U.) ; Thomas, A. (Mainz U.) ; Tiator, L. (Mainz U.) ; Unverzagt, M. (Mainz U.) ; Watts, D.P. (Edinburgh U.) ; Werthmuller, D. (Basel U.) ; Workman, R.L. (George Washington U.) ; Zamboni, I. (Boskovic Inst., Zagreb) ; Zehr, F. (Basel U.)

Published in: Phys.Rev.
Year: 2010
Vol.: C82
Page No: 035208
Pages: 14

Abstract: The gp-->etap reaction has been measured with the Crystal Ball and TAPS multiphoton spectrometers in the energy range from the production threshold of 707 MeV to 1.4 GeV (1.49 =< W >= 1.87 GeV). Bremsstrahlung photons produced by the 1.5-GeV electron beam of the Mainz Microtron MAMI-C and momentum analyzed by the Glasgow Tagging Spectrometer were used for the eta-meson production. Our accumulation of 3.8 x 10^6 gp-->etap-->3pi0p-->6gp events allows a detailed study of the reaction dynamics. The gp-->etap differential cross sections were determined for 120 energy bins and the full range of the production angles. Our data show a dip near W = 1680 MeV in the total cross section caused by a substantial dip in eta production at forward angles. The data are compared to predictions of previous SAID and MAID partial-wave analyses and to thelatest SAID and MAID fits that have included our data.

Web-Page: http://durpdg.dur.ac.uk/cgi-hepdata/hepreac/8706832; http://inspirebeta.net/record/860725/files/aa01NC_9a.png; http://inspirebeta.net/record/860725/files/aa02NC_9b.png; http://inspirebeta.net/record/860725/files/aa04aC_10a.png; http://inspirebeta.net/record/860725/files/aa04bC_10b.png; http://inspirebeta.net/record/860725/files/aa04cC_10c.png; http://inspirebeta.net/record/860725/files/aa04dC_10d.png; http://inspirebeta.net/record/860725/files/aa04eC_10e.png; http://inspirebeta.net/record/860725/files/aa04fC_10f.png; http://inspirebeta.net/record/860725/files/aa04gC_10g.png; http://inspirebeta.net/record/860725/files/aa04hC_10h.png; http://inspirebeta.net/record/860725/files/aa04iC_10i.png; http://inspirebeta.net/record/860725/files/aa06a_5a.png; http://inspirebeta.net/record/860725/files/aa06b_5b.png; http://inspirebeta.net/record/860725/files/aa06c_5c.png; http://inspirebeta.net/record/860725/files/aa06d_5d.png; http://inspirebeta.net/record/860725/files/aa07_6.png; http://inspirebeta.net/record/860725/files/aa07d_7b.png; http://inspirebeta.net/record/860725/files/aa07t_7a.png; http://inspirebeta.net/record/860725/files/aa08C_11a.png; http://inspirebeta.net/record/860725/files/aa09C_11b.png; http://inspirebeta.net/record/860725/files/aa0a_8.png; http://inspirebeta.net/record/860725/files/beameta_mamic_2_1.png; http://inspirebeta.net/record/860725/files/coseta3pi0_1060mev_v2_4.png; http://inspirebeta.net/record/860725/files/coseta3pi0_760mev_v2_3.png; http://inspirebeta.net/record/860725/files/n1abC_12.png; http://inspirebeta.net/record/860725/files/p3pi0_bg_bm10_2.png; http://inspirebeta.net/record/860725/files/x2a_13.png

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