Differential cross sections and photon beam asymmetries of ? photoproduction on the proton at E-?=1.3-2.4 GeV

Hashimoto, T.; Nam, T.; Muramatsu, N.; Ahn, J. K.; Chang, W. C.; Chen, J. Y.; Chu, M. L.; Date, S.; Gogami, T.; Goto, H.; Hamano, H.; He, Q. H.; Hicks, K.; Hiraiwa, T.; Honda, Y.; Hotta, T.; Ikuno, H.; Inoue, Y.; Ishikawa, T.; Jaegle, I; Jo, J. M.; Kasamatsu, Y.; Katsuragawa, H.; Kido, S.; Kon, Y.; Masumoto, S.; Matsumura, Y.; Miyabe, M.; Mizutani, K.; Nakamura, T.; Nakano, T.; Niiyama, M.; Nozawa, Y.; Ohashi, Y.; Ohnishi, H.; Ohta, T.; Ozawa, K.; Rangacharyulu, C.; Ryu, S. Y.; Sada, Y.; Shibukawa, T.; Shimizu, H.; Shirai, R.; Shiraishi, K.; Strokovsky, E. A.; Sugaya, Y.; Sumihama, M.; Suzuki, S.; Tanaka, S.; Taniguchi, Y.; Tokiyasu, A.; Tomida, N.; Tsuchikawa, Y.; Ueda, T.; Yamazaki, H.; Yamazaki, R.; Yanai, Y.; Yorita, T.; Yoshida, C.; Yosoi, M.

doi:10.1103/PhysRevC.106.035201

상세 보기

Differential cross sections and photon beam asymmetries of ? photoproduction on the proton at E-?=1.3-2.4 GeV

Hashimoto, T.;
Nam, T.;
Muramatsu, N.;
Ahn, J. K.;
Chang, W. C.;
외 55명

Citations

WEB OF SCIENCE

9

Citations

SCOPUS

10

초록

We report exclusive measurements for the eta photoproduction on a proton target. The differential cross sections and photon beam asymmetries of the gamma p -> eta p reaction are measured in a center-of-mass energy (W) range of 1.82-2.32 GeV and a polar angle range of -1.0 < cos theta eta c.m. < 0.6 by using a large acceptance calorimeter (BGOegg) and forward-angle charged-particle detectors at the SPring-8 LEPS2 beamline. The reaction is identified with a kinematic fitting method to select a recoil proton and two photons produced in an eta meson decay. A bump structure at W = 2.0-2.3 GeV in the differential cross section is confirmed at extremely backward eta polar angles, where the existing data are inconsistent with each other. This bump structure is likely associated with high-spin resonances that couple with ss over bar quarks. The photon beam asymmetries in a wide eta polar angle range for the photon beam energies above 2.1 GeV are reported for the first time, providing an additional constraint to nucleon resonance studies at high energies.

키워드

ETA-PHOTOPRODUCTION; THRESHOLD; NUCLEON; SIGMA

제목: Differential cross sections and photon beam asymmetries of ? photoproduction on the proton at E-?=1.3-2.4 GeV

저자: Hashimoto, T.; Nam, T.; Muramatsu, N.; Ahn, J. K.; Chang, W. C.; Chen, J. Y.; Chu, M. L.; Date, S.; Gogami, T.; Goto, H.; Hamano, H.; He, Q. H.; Hicks, K.; Hiraiwa, T.; Honda, Y.; Hotta, T.; Ikuno, H.; Inoue, Y.; Ishikawa, T.; Jaegle, I; Jo, J. M.; Kasamatsu, Y.; Katsuragawa, H.; Kido, S.; Kon, Y.; Masumoto, S.; Matsumura, Y.; Miyabe, M.; Mizutani, K.; Nakamura, T.; Nakano, T.; Niiyama, M.; Nozawa, Y.; Ohashi, Y.; Ohnishi, H.; Ohta, T.; Ozawa, K.; Rangacharyulu, C.; Ryu, S. Y.; Sada, Y.; Shibukawa, T.; Shimizu, H.; Shirai, R.; Shiraishi, K.; Strokovsky, E. A.; Sugaya, Y.; Sumihama, M.; Suzuki, S.; Tanaka, S.; Taniguchi, Y.; Tokiyasu, A.; Tomida, N.; Tsuchikawa, Y.; Ueda, T.; Yamazaki, H.; Yamazaki, R.; Yanai, Y.; Yorita, T.; Yoshida, C.; Yosoi, M.

DOI: 10.1103/PhysRevC.106.035201

발행일: 2022-09-15

유형: Article

저널명: Physical Review c

권: 106

호: 3

언어: ENG

출판사: AMER PHYSICAL SOC

발행국가: 미국

ISSN: E 2469-9993
P 2469-9985