Precise measurement of spin-averaged χcJ(1P) mass using photon conversions in ψ(2S)→γχcJ

M. Ablikim,J. Bai, Y. Ban,J. Bian, X. Cai, J. Chang,H. Chen,J. Chen,Jin Chen,Jun Chen,M. Chen,Y. Chen,S. Chi,Y. Chu,X. Cui,H. Dai,Y. Dai,Z. Deng,L. Dong,Q. Dong,S. Du,Z. Du, J. Fang,S. Fang, C. Fu,H. Fu,C. Gao, Y. Gao,M. Gong,W. Gong,S. Gu, Y. Guo, Z. Guo,F. Harris,K. He, M. He,X. He, Y. Heng,H. Hu, T. Hu, G. Huang,X. Huang,X. Ji, C. Jiang,X. Jiang,D. Jin, S. Jin,Y. Jin,Yi Jin,Y. Lai, F. Li, G. Li, H. Li, J. Li,Q. Li,R. Li,S. Li, W. Li, X. Li, Y. Li, Y. Liang,H. Liao, C. Liu,F. Liu,Fang Liu,H. Liu,J. Liu,R. Liu,Z. Liu,F. Lu,G. Lu, H. Lu,J. Lu,C. Luo,L. Luo, X. Luo,F. Ma,H. Ma,J. Ma,L. Ma,Q. Ma,X. Ma, Z. Mao, X. Mo, J. Nie,Z. Nie,S. Olsen,H. Peng,N. Qi,C. Qian, H. Qin, J. Qiu,Z. Ren,G. Rong,L. Shan,L. Shang,D. Shen,X. Shen, H. Sheng,F. Shi,X. Shi,H. Sun,J. Sun,S. Sun,Y. Sun,Z. Sun, X. Tang,N. Tao, Y. Tian,G. Tong, G. Varner, D. Wang, J. Wang, K. Wang, L. Wang,M. Wang, P. Wang,S. Wang, W. Wang,Y. Wang,Z. Wang,Zhe Wang,Zheng Wang,C. Wei,D. Wei,N. Wu,Y. Wu,X. Xia,X. Xie,B. Xin,G. Xu,H. Xu,S. Xue, M. Yan,F. Yang,H. Yang,J. Yang, Y. Yang, M. Ye,Y. Ye,L. Yi,Z. Yi,C. Yu, G. Yu,C. Yuan, J. Yuan,Y. Yuan,S. Zang,Y. Zeng,Yu Zeng,B. Zhang, C. Zhang, D. Zhang,H. Zhang,J. Zhang,Q. Zhang,S. Zhang,X. Zhang,Y. Zhang,Yiyun Zhang, Z. Zhang,D. Zhao,J. Zhao,M. Zhao,P. Zhao, W. Zhao,X. Zhao,Y. Zhao,Z. Zhao, H. Zheng, J. Zheng,L. Zheng,Z. Zheng, X. Zhong, B. Zhou,G. Zhou, L. Zhou,N. Zhou, K. Zhu,Q. Zhu,Y. Zhu, Yingchun Zhu,Z. Zhu,B. Zhuang,X. Zhuang,B. Zou

PHYSICAL REVIEW D（2005）

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摘要

Beijing Electron-Positron Collider. The chi(cJ)(1P) states (J = 0, 1, 2) are clearly observed, and their masses and the spin-averaged chi(cJ) mass are determined to be M-chi c0 = 3414: 21 +/- 0.39 +/- 0.27, M-chi c1 = 3510.30 +/- 0.14 +/- 0.16, M-chi c2 = 3555.70 +/- 0.59 +/- 0.39, and M(P-3(cog)) = 3524.85 +/- 0.32 +/- 0.30 MeV/c(2), respectively.

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