标题:Study of J/psi -> p(p)over-bar and J/psi -> n(n)over-bar
作者:Ablikim, M.; Achasov, M. N.; Ambrose, D. J.; An, F. F.; An, Q.; An, Z. H.; Bai, J. Z.; Ban, Y.; Becker, J.; Berger, N.; Bertani, M 更多
作者机构:[Ablikim, M.; An, F. F.; An, Z. H.; Bai, J. Z.; Berger, N.; Cai, X.; Cao, G. F.; Chang, J. F.; Chen, G.; Chen, H. S.; Chen, J. C.; Chen, M. L.; Chen, 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:2012
卷:86
期:3
DOI:10.1103/PhysRevD.86.032014
摘要:The decays J/psi -> p (p) over bar and J/psi -> n (n) over bar have been investigated with a sample of 225.2 x 10(6) J/psi events collected with the BESIII detector at the BEPCII e(+)e(-) collider. The branching fractions are determined to be B(J/psi -> p (p) over bar) = (2.112 +/- 0.004 +/- 0.031 x 10(-3) and B(J/psi -> n (n) over bar) =(2.07 +/- 0.01 +/- 0.17) x 10(-3). Distributions of the angle theta between the proton or antineutron and the beam direction are well described by the form 1 + alpha cos(2)theta, and we find alpha = 0.595 +/- 0.012 +/- 0.015 for J/psi -> p (p) over bar and alpha = 0.50 +/- 0.04 +/- 0.21 for J/psi -> n (n) over bar. Our branching- fraction results suggest a large phase angle between the strong and electromagnetic amplitudes describing the J/psi -> N (N) over bar decay.
收录类别:SCIE
WOS核心被引频次:10
资源类型:期刊论文
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