Search for the Θ+ via the K+ p → π+X reaction with a 1.2 GeV/c K+ beam-猫眼课题宝

DOI：

10.1103/physrevc.77.045203

发表时间：

2007-12

期刊：

Physical Review C

影响因子：

3.1

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

K. Miwa;S. Dairaku;D. Nakajima;S. Ajimura;J. Arvieux;H. Fujimura;H. Fujioka;T. Fukuda;H. Funahashi;M. Hayata;K. Hicks;K. Imai;S. Ishimoto;T. Kameyama;S. Kamigaito;S. Kinoshita;T. Koike;Y. Ma;T. Maruta;Y. Miura;M. Miyabe;T. Nagae;T. Nakano;K. Nakazawa;M. Naruki;H. Noumi;M. Niiyama;N. Saito;Y. Sato;S. Sawada;Y. Seki;M. Sekimoto;K. Senzaka;K. Shirotori;K. Shoji;S. Suzuki;H. Takahashi;Tadayuki Takahashi;Toshiharu Takahashi;H. Tamura;N. Tanaka;K. Tanida;A. Toyada;T. Watanabe;M. Yosoi;R. Zavislak

在KEK-PS 12 GeV质子同步加速器的K6束线上，用1.2GeV/c K+束通过K + p2 →π + X反应寻找Θ +。在K + pp →π + X反应的缺失质谱中，没有观察到清晰的峰结构。因此，90% C. L.在实验室坐标系下，K + p → π + θ +反应的微分截面在2° ~ 22°范围内平均，其上限为3.5 μB/sr。该上限远小于交换K 0 * 的t通道过程的理论计算。从目前的结果来看，t沟道过程被排除或者耦合常数gK*NΘ非常小。

The Θ + was searched for via the K + p 2→π + X reaction using the 1.2 GeV/c K+ beam at the K6 beam line of the KEK-PS 12 GeV Proton Synchrotron. In the missing mass spectrum of the K + p p→π + X reaction, no clear peak structure was observed. Therefore a 90% C.L. upper limit of 3.5 μb/sr was derived for the differential cross section averaged over 2° to 22° in the laboratory frame of the K + p → π + Θ + reaction. This upper limit is much smaller than the theoretical calculation for the t-channel process where a K 0 * is exchanged. From the present result, either the t-channel process is excluded or the coupling constant of gK*NΘ is quite small.

Search for the Θ+ via the K+ p → π+X reaction with a 1.2 GeV/c K+ beam

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