Photoproduction of eta mesons off protons for Egamma <= 1.15-GeV
Photoproduction of eta mesons off protons for Egamma <= 1.15-GeV
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Egamma <= 1.15-GeV 的 eta 介子与质子的光产生
DOI：
10.1103/physrevc.74.035202
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发表时间：
2006
影响因子：
3.1
通讯作者：
H. Yoshida
中科院分区：
文献类型：
--
作者：
T. Nakabayashi;H. Fukasawa;R. Hashimoto;T. Ishikawa;T. Iwata;H. Kanda;J. Kasagi;T. Kinoshita;K. Maeda;F. Miyahara;K. Nawa;T. Nomura;H. Shimizu;T. Shishido;Kazutoshi Suzuki;Y. Tajima;T. Takahashi;H. Ueno;H. Yamazaki;H. Yoshida
{eta} mesons emitted from the photoproduction off protons were measured for 0.70{ =}930 MeV. The angular distributions obtained and the excitation function of the {gamma}p{yields}{eta}p reaction are essentially in good agreement with previously reported ones and are well explained by {eta}-MAID calculations. For the {gamma}p{yields}{pi}{eta}N reaction, the cross section increases monotonically with increasing photon energy, and it almost reaches the value of the {gamma}p{yields}{eta}p reaction at E{sub {gamma}}{approx}1.15 GeV. The momentum distributions are compared with kinematic calculations. It is suggested that the sequential decay process through the P{sub 33}(1232) resonance [{gamma}p{yields}{eta}P{sub 33}(1232){yields}{pi}{eta}N] contributes to the {gamma}p{yields}{pi}{eta}N reaction, in addition to the sequential process {gamma}p{yields}{pi}S{sub 11}(1535){yields}{pi}{eta}N and/or {pi} and {eta} emissions without intermediate nucleon resonances.
{eta} mesons emitted from the photoproduction off protons were measured for 0.70{ =}930 MeV. The angular distributions obtained and the excitation function of the {gamma}p{yields}{eta}p reaction are essentially in good agreement with previously reported ones and are well explained by {eta}-MAID calculations. For the {gamma}p{yields}{pi}{eta}N reaction, the cross section increases monotonically with increasing photon energy, and it almost reaches the value of the {gamma}p{yields}{eta}p reaction at E{sub {gamma}}{approx}1.15 GeV. The momentum distributions are compared with kinematic calculations. It is suggested that the sequential decay process through the P{sub 33}(1232) resonance [{gamma}p{yields}{eta}P{sub 33}(1232){yields}{pi}{eta}N] contributes to the {gamma}p{yields}{pi}{eta}N reaction, in addition to the sequential process {gamma}p{yields}{pi}S{sub 11}(1535){yields}{pi}{eta}N and/or {pi} and {eta} emissions without intermediate nucleon resonances.