Measurement of the χc2 polarization in ψ(2S)→γχc2

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,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,L. Huang,X. Huang,X. Ji,Q. Jia,C. Jiang,X. Jiang,D. Jin,S. Jin,Y. Jin,Y. Lai,F. Li,G. Li,H. Li,J. Li,Q. Li,R. Li,S. Li,W. Li,X. Li,Y. Liang,H. Liao,C. Liu,F. Liu,Fang Liu,H. Liu,J. Liu,R. Liu,Z. Liu,F. Lu,G. Lu,J. Lu,C. Luo,X. Luo,F. 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,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,Zhe Wang,Z. Wang,Zheng Wang,Z. Wang,C. Wei,D. Wei,N. Wu,Y. Wu,X. Xia,X. Xie,B. Xin,G. Xu,H. Xu,Y. Xu,S. Xue,M. Yan,F. Yang,H. Yang,J. Yang,S. Yang,Y. Yang,M. Ye,Y. Ye,L. Yi,Z. Yi,C. Yu,G. Yu,C. Yuan,J. Yuan,Y. Yuan,Q. Yue,S. Zang,Yu Zeng,Y. Zeng,B. Zhang,C. Zhang,D. Zhang,H. Zhang,J. Zhang,L. 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,B. Zou.

PHYSICAL REVIEW D（2004）

Cited 15|Views107

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Abstract

The polarization of the chi(c2) produced in psi(2S) decays into gammachi(c2) is measured using a sample of 14x10(6)psi(2S) events collected by the BESII detector at the BEPC storage ring. A fit to the chi(c2) production and decay angular distributions in psi(2S)-->gammachi(c2), chi(c2)-->pi(+)pi(-) and K+K- yields values x=A(1)/A(0)=2.08+/-0.44 and y=A(2)/A(0)=3.03+/-0.66, with a correlation rho=0.92 between them, where A(0,1,2) are the chi(c2) helicity amplitudes. The measurement agrees with a pure E1 transition, and M2 and E3 contributions do not differ significantly from zero.

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