By analyzing 482  pb−1 of e+e− collision data collected at √s=4.009  GeV with the BESIII detector at the BEPCII collider, we measure the absolute branching fractions for the semileptonic decays D^+_s→ηe^+ν_e and D^+_s→η′e^+ν_e to be B(D^+_s→ηe^+ν_e)=(2.30±0.31±0.08)% and B(D^+_s→η′e^+ν_e)=(0.93±0.30±0.05)%, respectively, and their ratio B(D^+_s→η′e^+ν_e)/ B(D^+_s→ηe^+ν_e) = 0.40±0.14±0.02, where the first uncertainties are statistical and the second ones are systematic. The results are in good agreement with previous measurements within uncertainties; they can be used to determine the η−η′ mixing angle and improve upon the D^+_s semileptonic branching ratio precision.

Measurements of the absolute branching fractions for Ds+ →ηe+νe and Ds+ →η′e+νe

AMOROSO, Antonio;BIANCHI, Fabrizio;DESTEFANIS, Marco Giovanni Maria;DE MORI, FRANCESCA;GRECO, Michela;HU, Jifeng;MAGGIORA, MARCO;MARCELLO, Simonetta;SOSIO, Stefano;SPATARO, STEFANO GIOVANNI;ZOTTI, LAURA;
2016-01-01

Abstract

By analyzing 482  pb−1 of e+e− collision data collected at √s=4.009  GeV with the BESIII detector at the BEPCII collider, we measure the absolute branching fractions for the semileptonic decays D^+_s→ηe^+ν_e and D^+_s→η′e^+ν_e to be B(D^+_s→ηe^+ν_e)=(2.30±0.31±0.08)% and B(D^+_s→η′e^+ν_e)=(0.93±0.30±0.05)%, respectively, and their ratio B(D^+_s→η′e^+ν_e)/ B(D^+_s→ηe^+ν_e) = 0.40±0.14±0.02, where the first uncertainties are statistical and the second ones are systematic. The results are in good agreement with previous measurements within uncertainties; they can be used to determine the η−η′ mixing angle and improve upon the D^+_s semileptonic branching ratio precision.
2016
94
11
112003-01
112003-10
http://harvest.aps.org/bagit/articles/10.1103/PhysRevD.94.112003/apsxml
Nuclear and High Energy Physics
Ablikim, M.; Achasov, M.N.; Ahmed, S.; Ai, X.C.; Albayrak, O.; Albrecht, M.; Ambrose, D.J.; Amoroso, A.; An, F.F.; An, Q.; Bai, J.Z.; Bakina, O.; Bald...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1635626
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