Search for baryon and lepton number violating decay D± → n((n)over-bar)e±

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Albrecht, M.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, X. H.; Bai, Y.; Bakina, O.; Ferroli, R. Baldini; Balossino, I; Ban, Y.; Batozskaya, V; Becker, D.; Begzsuren, K.; Berger, N.; Bertani, M.; Bettoni, D.; Bianchi, F.; Bloms, J.; Bortone, A.; Boyko, I; Briere, R. A.; Brueggemann, A.; Cai, H.; Cai, X.; Calcaterra, A.; Cao, G. F.; Cao, N.; Cetin, S. A.; Chang, J. F.; Chang, W. L.; Chelkov, G.; Chen, C.; Chen, Chao; Chen, G.; Chen, H. S.

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摘要

Using a data set of electron-positron collisions corresponding to an integrated luminosity of 293 fb(-1) taken with the BESIII detector at a center-of-mass energy of 3.773 GeV, a search for the baryon (B) and lepton (L) number violating decays D-+/- -> n((n) over bar )e(+/-) is performed. No signal is observed and the upper limits on the branching fractions at the 90% confidence level are set to be 1.43 x 10(-5) for the decays D+(-) -> (n) over bar (n)e(+(-)) with Delta|B - L| = 0, and 2.91 x 10(-5) for the decays D+(-) -> n((n) over bar )e(+(-)) with Delta|B - L| = 2, where Delta|B - L| denotes the change in the difference between baryon and lepton numbers.

关键词

B-L SYMMETRY