Measurements of J/psi -> p(p)over-bar
- Bai, JZ
- Ban, Y
- Bian, JG
- Cai, X
- Chang, JF
- Chen, HF
- Chen, HS
- Chen, HX
- Chen, J
- Chen, JC
- Chen, J
- Chen, ML
- Chen, YB
- Chi, SP
- Chu, YP
- Cui, XZ
- Dai, HL
- Dai, YS
- Deng, ZY
- Dong, LY
- Du, SX
- Du, ZZ
- Fang, J
- Fang, SS
- Fu, CD
- Fu, HY
- Fu, LP
- Gao, CS
- Gao, ML
- Gao, YN
- Gong, MY
- Gong, WX
- Gu, SD
- Guo, YN
- Guo, YQ
- Guo, ZJ
- Han, SW
- Harris, FA
- He, J
- He, KL
- He, M
- He, X
- Heng, YK
- Hu, HM
- Hu, T
- Huang, GS
- Huang, L
- Huang, XP
- Ji, XB
- Jia, QY
- Jiang, CH
- Jiang, XS
- Jin, DP
- Jin, S
- Jin, Y
- Lai, YF
- Li, F
- Li, G
- Li, HH
- Li, J
- Li, JC
- Li, QJ
- Li, RB
- Li, RY
- Li, S
Publication date
January 2004
DOI Publisher
physics letters b Journal
issn:0370-2693Abstract
The process J/psi --> p (p) over bar is studied using 57.7 x 10(6) J/psi events collected with the BESII detector at the Beijing Electron Positron Collider. The branching ratio is determined to be Br(J/psi --> p (p) over bar) = (2.26 +/- 0.01 +/- 0.14) x 10(-3), and the angular distribution is well described by dN/dcostheta(p) = 1 + alphacos(2)theta(p) with alpha = 0.676 +/- 0.036 +/- 0.042, where theta(p) is the angle between the proton and beam directions. The value of alpha obtained is in good agreement with the predictions of first-order QCD. (C) 2004, Published by Elsevier B.V.Physics, MultidisciplinarySCI(E)0ARTICLE1-242-4859
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