Observation of a near threshold enhancement in th p anti-p mass spectrum from radiative J / psi ---> gamma p anti-p decays
Observation of a near threshold enhancement in th p anti-p mass spectrum from radiative J / psi ---> gamma p anti-p decays
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DOI：
10.1103/physrevlett.91.022001
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发表时间：
2003-03
影响因子：
8.6
通讯作者：
J. Bai;S. Fang;H. Yang;L. Zhou;F. Ma;L. Fu;Y. Dai;Z. Zhang;F. Liu;Song Yang;Y. Lai;F. Shi;S. Olsen;S. Xue;R. Malchow;Zhangli Liu;H. Peng;Q. Yue;Z. Guo;M. He;L. Zhang;W. Gong;Weidong Li;X. Tang;Y. Zeng;X. Xia;P. Wang;Y. Xu;H. Li;Y. Dai;H. Sun;F. Liu;Yingchun Zhu;J. Fang;D. Tian;X. Huang;G. Lu;H. Chen;J. He;J. Qiu;L. Wang;J. Nie;Jinmian Li;H. Fu;X. Luo;L. Song;G. Rong;Jingqing Zhang;L. Dong;X. He;C. Fu;Z. Sun;K. He;H. Sheng;Xue-qian Li;H. Hu;J. Zheng;X. Meng;J. Liu;D. Zhao;B. Zhou;S. Zhang;G. Tong;Z. Zhu;Z. Liu;Z. Zheng;Y. Zhang;Y. Zhu;J. Ying;Z. Nie;M. Gao;Y. Wang;Q. Zhu;Z. Du;Meng Wang;S. Han;D. Zhang;Z. Ke;X. Cai;W. Wang;Y. Chu;J. Yuan;Z. Wang;G. Yang;X. Shen;B. Zou;Zhe Wang;X. Xie;L. Huang;G. Xu;X. Jiang;C. Qian;C. Yuan;S. Tang;X. Mo;J. Wang;W. Toki;Yi Jin;Yiyun Zhang;P. Zhao;N. Qi;Z. Wang;W. Li;L. Zheng;Y. Zhao;Q. Li;K. Li;P. Wang;G. Li;J. Chen;W. Yan;C. Liu;Z. Lu;M. Yan;Jiming Yang;R. Liu;F. Lu;Y. Ban;C. Zhang;J. Lu;Yang Tian;H. Zhang;R. Li;Z. Mao;J. Bian;Y. Sun;H. Chen;X. Ji;D. Shen;N. Zhou;Chun-xu Yu;R. Li;J. Zhang;Qiyang Zhang;X. Zhang;F. Li;Z. Zhao;J. Chang;S. Chi;M. Gong;C. Wei;Y. Ye;H. Liu;B. Zhang;Zheng Wang;H. Lu;Y. Zhang;B. Zhang;G. Varner;Y. Chen;F. Harris;T. Hu;W. Dunwoodie;X. Cui;G. Zhou;B. Jones;Y. Guo;Jun-Bing Ma;G. Huang;C. Gao;E. Ma;J. Li;D. Paluselli;J. Zhang;S. Du;S. Jin;Y. Gao;S. Sun;Y. Yuan;K. Zhu;J. Izen;Y. Liu;Jie Chen;Y. Zhu;X. Zhong;M. Ye;M. Wang;Wei Zhao;X. Lou;H. Shen;T. Hong;J. Zhao;Chunxiu Liu;C. Jiang;Y. Heng;S. Gu;D. Jin;B. Zhuang;D. Kong;G. Yu;S. Zang;Y. Guo;Jiawei Zhao;N. Wu;J. Liu
中科院分区：
文献类型：
--
作者：
J. Bai;S. Fang;H. Yang;L. Zhou;F. Ma;L. Fu;Y. Dai;Z. Zhang;F. Liu;Song Yang;Y. Lai;F. Shi;S. Olsen;S. Xue;R. Malchow;Zhangli Liu;H. Peng;Q. Yue;Z. Guo;M. He;L. Zhang;W. Gong;Weidong Li;X. Tang;Y. Zeng;X. Xia;P. Wang;Y. Xu;H. Li;Y. Dai;H. Sun;F. Liu;Yingchun Zhu;J. Fang;D. Tian;X. Huang;G. Lu;H. Chen;J. He;J. Qiu;L. Wang;J. Nie;Jinmian Li;H. Fu;X. Luo;L. Song;G. Rong;Jingqing Zhang;L. Dong;X. He;C. Fu;Z. Sun;K. He;H. Sheng;Xue-qian Li;H. Hu;J. Zheng;X. Meng;J. Liu;D. Zhao;B. Zhou;S. Zhang;G. Tong;Z. Zhu;Z. Liu;Z. Zheng;Y. Zhang;Y. Zhu;J. Ying;Z. Nie;M. Gao;Y. Wang;Q. Zhu;Z. Du;Meng Wang;S. Han;D. Zhang;Z. Ke;X. Cai;W. Wang;Y. Chu;J. Yuan;Z. Wang;G. Yang;X. Shen;B. Zou;Zhe Wang;X. Xie;L. Huang;G. Xu;X. Jiang;C. Qian;C. Yuan;S. Tang;X. Mo;J. Wang;W. Toki;Yi Jin;Yiyun Zhang;P. Zhao;N. Qi;Z. Wang;W. Li;L. Zheng;Y. Zhao;Q. Li;K. Li;P. Wang;G. Li;J. Chen;W. Yan;C. Liu;Z. Lu;M. Yan;Jiming Yang;R. Liu;F. Lu;Y. Ban;C. Zhang;J. Lu;Yang Tian;H. Zhang;R. Li;Z. Mao;J. Bian;Y. Sun;H. Chen;X. Ji;D. Shen;N. Zhou;Chun-xu Yu;R. Li;J. Zhang;Qiyang Zhang;X. Zhang;F. Li;Z. Zhao;J. Chang;S. Chi;M. Gong;C. Wei;Y. Ye;H. Liu;B. Zhang;Zheng Wang;H. Lu;Y. Zhang;B. Zhang;G. Varner;Y. Chen;F. Harris;T. Hu;W. Dunwoodie;X. Cui;G. Zhou;B. Jones;Y. Guo;Jun-Bing Ma;G. Huang;C. Gao;E. Ma;J. Li;D. Paluselli;J. Zhang;S. Du;S. Jin;Y. Gao;S. Sun;Y. Yuan;K. Zhu;J. Izen;Y. Liu;Jie Chen;Y. Zhu;X. Zhong;M. Ye;M. Wang;Wei Zhao;X. Lou;H. Shen;T. Hong;J. Zhao;Chunxiu Liu;C. Jiang;Y. Heng;S. Gu;D. Jin;B. Zhuang;D. Kong;G. Yu;S. Zang;Y. Guo;Jiawei Zhao;N. Wu;J. Liu
我们观察到辐射J/{psi}{屈服}{伽马}p{bar p}衰变引起的p{bar p}对的不变质量谱在2m{subp}附近有一个窄的增强。在J/{psi}{屈服}{pi}{sup 0}p{bar p}衰变中没有看到类似的结构。这一结果是基于北京正负电子对撞机上的BESII探测器积累的5800万个J/{psi}衰变事件样本的分析得出的。这种增强功能可以适用于S波或P波Breit Wigner共振功能。在S波拟合的情况下，在M=1859{sub10}{sup+3}(Stat){sub25}{sup+5}(Sys)MeV/c{sup 2}时，峰质量小于2m{sup}，在90%置信度水平下，总宽度为30 MeV/c{sup 2}。这些质量和宽度值与任何已知粒子的属性都不一致。
We observe a narrow enhancement near 2m{sub p} in the invariant mass spectrum of p{bar p} pairs from radiative J/{psi} {yields} {gamma}p{bar p} decays. No similar structure is seen in J/{psi} {yields} {pi}{sup 0} p{bar p} decays. The results are based on an analysis of a 58 million event sample of J/{psi} decays accumulated with the BESII detector at the Beijing electron-positron collider. The enhancement can be fit with either an S- or P-wave Breit Wigner resonance function. In the case of the S-wave fit, the peak mass is below 2m{sup p} at M = 1859{sub -10}{sup +3} (stat){sub -25}{sup +5} (sys) MeV/c{sup 2} and the total width is {Lambda} < 30 MeV/c{sup 2} at the 90 percent confidence level. These mass and width values are not consistent with the properties of any known particle.