Study of J/psi -> p(p)over-bar and J/psi -> n(n)over-bar
- 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.
- Bian, J. M.
- Boger, E.
- Bondarenko, O.
- Boyko, I.
- Briere, R. A.
- Bytev, V.
- Cai, X.
- Calcaterra, A.
- Cao, G. F.
- Chang, J. F.
- Chelkov, G.
- Chen, G.
- Chen, H. S.
- Chen, J. C.
- Chen, M. L.
- Chen, S. J.
- Chen, Y.
- Chen, Y. B.
- Cheng, H. P.
- Chu, Y. P.
- Cronin-Hennessy, D.
- Dai, H. L.
- Dai, J. P.
- Dedovich, D.
- Deng, Z. Y.
- Denig, A.
- Denysenko, I.
- Destefanis, M.
- Ding, W. M.
- Ding, Y.
- Dong, L. Y.
- Dong, M. Y.
- Du, S. X.
- Fang, J.
- Fang, S. S.
- Kalantar-Nayestanaki, N.
- Kavatsyuk, M.
- Loehner, H.
- Messchendorp, J. G.
DOIAbstract
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 electromag...
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