Branching fraction measurements of χc0 and χc2 to π0π0 and ηη

M. Ablikim,M. N. Achasov,L. An,Q. An,Z. H. An,J. Z. Bai,Y. Ban,Niklaus Berger,J. M. Bian,I. Boyko,R. A. Briere,V. Bytev,X. Cai,G. F. Cao,X. X. Cao,J. F. Chang,G. Chelkov,Guo-Ming Chen,Haosheng Chen, J. C. Chen,L. P. Chen,M. L. Chen,Peng Chen,Sai-Juan Chen,Yi Bing Chen,Y. P. Chu,Daniel P Cronin-Hennessy,H. L. Dai,J. P. Dai,D. Dedovich,Z. Y. Deng,I. Denysenko,M. Destefanis,Y. Ding,L. Y. Dong,M. Y. Dong,S. X. Du,M. Y. Duan,J. Fang,C. Q. Feng,C. D. Fu,J. L. Fu,Yang Gao,C. Geng,K. Goetzen,W. X. Gong,M. Greco,S. Grishin,Y. T. Gu,A. Q. Guo,L. B. Guo,Y. P. Guo,Shuang Han,F. A. Harris,Kunlun He,Miao He,Z. Y. He,Y. K. Heng,Z. L. Hou,H. M. Hu,J. F. Hu,Tao Hu,X. W. Hu,B. Huang,G. M. Huang,J. S. Huang,Xingtao Huang,Y. P. Huang,C. S. Ji,Q. Ji,X. B. Ji,X. L. Ji,L. K. Jia,L. L. Jiang,X. S. Jiang,J. B. Jiao,D. P. Jin,Shouguang Jin,Sachio Komamiya,W. Kuehn,S. Lange,J. K. C. Leung,Cheng Li,Cui Li,D. M. Li,Feng Li,G. Li,Hua-Bin Li,J. C. Li,Jiemin Li, Lei Li, Lu Li,Q. J. Li,Wei Li,W. G. Li, X. L. Li,X. N. Li,X. Q. Li,X. R. Li,Yongxiang Li

Physical Review D（2010）

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摘要

Using a sample of 1.06 x 10(8) psi' decays collected by the BESIII detector, chi(c0) and chi(c2) decays into pi(0)pi(0) and eta eta are studied. The branching fraction results are Br(chi(c0) -> pi(0)pi(0)) = (3.23 +/- 0.03 +/- 0.23 +/- 0.14) x 10(-3), Br(chi(c2) -> pi(0)pi(0)) = (8.8 +/- 0.2 +/- 0.6 +/- 0.4) x 10(-4), Br(chi(c0) -> eta eta) = (3.44 +/- 0.10 +/- 0.24 +/- 0.2) x 10(-3), and Br(chi(c2) -> eta eta) = (6.5 +/- 0.4 +/- 0.5 +/- 0.3) x 10(-4), where the uncertainties are statistical, systematic due to this measurement, and systematic due to the branching fractions of psi' -> gamma chi(cJ). The results provide information on the decay mechanism of chi(c) states into pseudoscalars.

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