Measurement of the branching fractions for J/{psi}{yields}{gamma}{pi}{sup 0}, {gamma}{eta} and {gamma}{eta}{sup '}

Journal Article · Wed Mar 01 00:00:00 EST 2006 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.73.052008· OSTI ID:20776834

Ablikim, M; Bai, J Z; Bian, J G; Cai, X; Chen, H S; Chen, H X; Chen, J C; Jin, Chen; Chen, Y B; Chu, Y P; Cui, X Z; Deng, Z Y; Du, S X; Fang, J; Fu, C D; Gao, C S; Gu, S D; Guo, Y N; Guo, Y Q; He, K L ^[1]

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1. Institute of High Energy Physics, Beijing 100049 (China)

The decay modes J/{psi}{yields}{gamma}{pi}{sup 0}, {gamma}{eta} and {gamma}{eta}{sup '} are analyzed using a data sample of 58x10{sup 6} J/{psi} decays collected with the BESII detector at the BEPC. The branching fractions are determined to be: Br(J/{psi}{yields}{gamma}{pi}{sup 0})=(3.13{sub -0.47}{sup +0.65})x10{sup -5}, Br(J/{psi}{yields}{gamma}{eta})=(11.23{+-}0.89)x10{sup -4}, and Br(J/{psi}{yields}{gamma}{eta}{sup '})=(5.55{+-}0.44)x10{sup -3}, where the errors are combined statistical and systematic errors. The ratio of partial widths {gamma}(J/{psi}{yields}{gamma}{eta}{sup '})/{gamma}(J/{psi}{yields}{gamma}{eta}) is measured to be 4.94{+-}0.40, and the singlet-octet pseudoscalar mixing angle of {eta}-{eta}{sup '} system is determined.

• OSTI ID: 20776834
• Journal Information: Physical Review. D, Particles Fields, Vol. 73, Issue 5; Other Information: DOI: 10.1103/PhysRevD.73.052008; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

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ETA MESONS
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PHOTONS