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Measurement of the branching fractions for J/->gamma pi(0), and gamma eta ' and study of eta '->gamma pi(+)pi(-) decay dynamics
BES Callaboration
2007
发表期刊INTERNATIONAL JOURNAL OF MODERN PHYSICS A
卷号22期号:2--3页码:637-640
通讯作者Chen, HX (reprint author), Chinese Acad Sci, Inst High Energy Phys, 19B Yuquan Rd, Beijing, Peoples R China.
摘要The decay modes J/psi -> gamma pi(0), gamma eta and gamma eta' are analyzed using a data sample of 58 million J/psi decays collected with the BESII detector at the BEPC. The branching fractions are determined to be Br(J/psi -> gamma pi(0)) = (3.13(-0.47)(+0.65) x 10(-5), Br( J/psi -> gamma eta) = (11.23 +/- 0.89) x 10(-4), and Br(J/psi -> gamma eta') = ( 5.55 +/- 0.44) x 10(-3), where the errors are combined statistical and systematic errors. The ratio of partial widths and the singlet octet pseudoscalar mixing angle of eta - eta' system is determined. The eta' -> gamma pi(+)pi(-) decay dynamics is studied using 22,000 reconstructed J/psi -> gamma eta' -> gamma gamma pi(+)pi(-) events, the pi(+)pi(-) mass spectrum is fitted using different theoretical descriptions. The preliminary results show that only the rho(770) is not enough to describe the eta' -> gamma pi(+)pi(-) decay process and a non-rho(770) contribution is needed.
学科领域Physics
DOI10.1142/S0217751X07036014
收录类别SCI
语种英语
WOS类目Physics, Nuclear ; Physics, Particles & Fields
WOS记录号WOS:000250926800068
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/212834
专题实验物理中心
作者单位中国科学院高能物理研究所
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BES Callaboration. Measurement of the branching fractions for J/->gamma pi(0), and gamma eta ' and study of eta '->gamma pi(+)pi(-) decay dynamics[J]. INTERNATIONAL JOURNAL OF MODERN PHYSICS A,2007,22(2--3):637-640.
APA BES Callaboration.(2007).Measurement of the branching fractions for J/->gamma pi(0), and gamma eta ' and study of eta '->gamma pi(+)pi(-) decay dynamics.INTERNATIONAL JOURNAL OF MODERN PHYSICS A,22(2--3),637-640.
MLA BES Callaboration."Measurement of the branching fractions for J/->gamma pi(0), and gamma eta ' and study of eta '->gamma pi(+)pi(-) decay dynamics".INTERNATIONAL JOURNAL OF MODERN PHYSICS A 22.2--3(2007):637-640.
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