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.File | Dimensione | Formato | |
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PhysRevD.94.112003.pdf
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PhysRevD.94.112003.1608.06484_4aperto.pdf
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