标题:Search for eta and eta ' -> pi(+)e(-)(v)over-bar(e) + c.c. decays in J/psi -> phi eta and phi eta '
作者:Ablikim, M.; Achasov, M. N.; Albayrak, O.; Ambrose, D. J.; An, F. F.; An, Q.; Bai, J. Z.; Ferroli, R. Baldini; Ban, Y.; Becker, J.; 更多
作者机构:[Ablikim, M.; An, F. F.; Bai, J. Z.; Cai, X.; Calcaterra, A.; Cao, G. F.; Chang, J. F.; Chen, G.; Chen, H. S.; Chen, J. C.; Chen, M. L.; Chen, Y. B.; 更多
通讯作者:Ablikim, M
通讯作者地址:[Ablikim, M]Inst High Energy Phys, Beijing 100049, Peoples R China.
来源:PHYSICAL REVIEW D
出版年:2013
卷:87
期:3
DOI:10.1103/PhysRevD.87.032006
摘要:Using a sample of 225.3 million J/psi events collected with the BESIII detector at the BEPCII e(+)e(-) collider in 2009, searches for the decays of eta and eta' -> pi(+)e(-)(v) over bar (e) + c.c. in J/psi -> phi eta and phi eta' are performed. The phi signals, which are reconstructed in K+K- final states, are used to tag eta and eta' semileptonic decays. No signals are observed for either eta or eta', and upper limits at the 90% confidence level are determined to be 7.3 x 10(-4) and 5.0 x 10(-4) for the ratios B(eta ->pi(+)e(-)(v) over bar (e) + c.c)/B(eta ->pi(+)pi(-)pi(0)) and B(eta'->pi(+)e(-)(v) over bar (e) + c.c)/B(eta'->pi(+)pi(-)eta) respectively. These are the first upper- limit values determined for eta and eta' semileptonic weak decays. DOI: 10.1103/PhysRevD.87.032006
收录类别:SCIE
WOS核心被引频次:12
资源类型:期刊论文
TOP