학술논문
Study of the gp-->etap reaction with the Crystal Ball detector at the Mainz Microtron(MAMI-C)
Document Type
Working Paper
Author
McNicoll, E. F.; Prakhov, S.; Strakovsky, I. I.; Aguar-Bartolomepmainz, P.; Akasoy, L. K.; Annand, J. R. M.; Arends, H. J.; Arndt, R. A.; Azimov, Ya. I.; Bantawa, K.; Beck, R.; Bekrenev, V. S.; Berghaeuser, H.; Braghieri, A.; Branford, D.; Briscoe, W. J.; Brudvik, J.; Cherepnya, S.; Codling, R. F. B.; Demissie, B. T.; Downie, E. J.; Drexler, P.; Fil'kov, L. V.; Fix, A.; Freehart, B.; Glazier, D. I.; Gregor, R.; Hamilton, D.; Heid, E.; Hornidge, D.; Jaegle, I.; Jahn, O.; Jude, T. C.; Kashevarov, V. L.; Kellie, J. D.; Keshelashvili, I.; Kondratiev, R.; Korolija, M.; Kotulla, M.; Koulbardis, A. A.; Kruglov, S. P.; Krusche, B.; Lisin, V.; Livingston, K.; MacGregor, I. J. D.; Maghrbi, Y.; Manley, D. M.; Marinides, Z.; Martinez, M.; McGeorge, J. C.; McKinnon, B.; Mekterovic, D.; Metag, V.; Micanovic, S.; Middleton, D.; Mushkarenkov, A.; Nefkens, B. M. K.; Nikolaev, A.; Novotny, R.; Ostrick, M.; Otte, P. B.; Oussena, B.; Paris, M. W.; Pedroni, P.; Pheron, F.; Polonski, A.; Robinson, J.; Rosner, G.; Rostomyan, T.; Schumann, S.; Sikora, M. H.; Sober, D. I.; Starostin, A.; Suarez, I. M.; Supek, I.; Thiel, M.; Thomas, A.; Tiator, L.; Unverzagt, M.; Watts, D. P.; Werthmueller, D.; Workman, R. L.; Zamboni, I.; Zehr, F.
Source
Phys.Rev.C82:035208,2010
Subject
Language
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.
Comment: 15 pages, 12 figures
Comment: 15 pages, 12 figures