Observation of Ds+ →p n ̄ and confirmation of its large branching fraction OBSERVATION of Ds+ →p n ̄ ... M. ABLIKIM et al.

Date Issued
01-02-2019
Author(s)
Ablikim, M.
Achasov, M. N.
Ahmed, S.
Albrecht, M.
Alekseev, M.
Amoroso, A.
An, F. F.
An, Q.
Bai, J. Z.
Bai, Y.
Bakina, O.
Baldini Ferroli, R.
Ban, Y.
Begzsuren, K.
Bennett, D. W.
Bennett, J. V.
Berger, N.
Bertani, M.
Bettoni, D.
Bianchi, F.
Boger, E.
Boyko, I.
Briere, R. A.
Cai, H.
Cai, X.
Cakir, O.
Calcaterra, A.
Cao, G. F.
Cetin, S. A.
Chai, J.
Chang, J. F.
Chelkov, G.
Chen, G.
Chen, H. S.
Chen, J. C.
Chen, M. L.
Chen, P. L.
Chen, S. J.
Chen, X. R.
Chen, Y. B.
Cheng, W.
Chu, X. K.
Cibinetto, G.
Cossio, F.
Dai, H. L.
Dai, J. P.
Dbeyssi, A.
Dedovich, D.
Deng, Z. Y.
Denig, A.
Denysenko, I.
Destefanis, M.
De Mori, F.
Ding, Y.
Dong, C.
Dong, J.
Dong, L. Y.
Dong, M. Y.
Dou, Z. L.
Du, S. X.
Duan, P. F.
Fang, J.
Fang, S. S.
Fang, Y.
Farinelli, R.
Fava, L.
Fegan, S.
Feldbauer, F.
Felici, G.
Feng, C. Q.
Fioravanti, E.
Fritsch, M.
Fu, C. D.
Gao, Q.
Gao, X. L.
Gao, Y.
Gao, Y. G.
Gao, Z.
Garillon, B.
Garzia, I.
Gilman, A.
Goetzen, K.
Gong, L.
Gong, W. X.
Gradl, W.
Greco, M.
Gu, M. H.
Gu, Y. T.
Guo, A. Q.
Guo, R. P.
Guo, Y. P.
Guskov, A.
Haddadi, Z.
Han, S.
Hao, X. Q.
Harris, F. A.
He, K. L.
He, X. Q.
Heinsius, F. H.
Held, T.
DOI
Abstract
The baryonic decay Ds+→pn̄ is observed, and the corresponding branching fraction is measured to be (1.21±0.10±0.05)×10-3, where the first uncertainty is statistical and second systematic. The data sample used in this analysis was collected with the BESIII detector operating at the BEPCII e+e- double-ring collider with a center-of-mass energy of 4.178 GeV and an integrated luminosity of 3.19 fb-1. The result confirms the previous measurement by the CLEO Collaboration and is of greatly improved precision. This result will improve our understanding of the dynamical enhancement of the W-annihilation topology in the charmed meson decays.
Volume
99