Measurement of the absolute branching fractions for purely leptonic D s + decays

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ahmed, S.; Albrecht, M.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, X. H.; Bai, Y.; Bakina, O.; Baldini Ferroli, R.; Balossino, I.; Ban, Y.; Begzsuren, K.; Berger, N.; Bertani, M.; Bettoni, D.; Bianchi, F.; Bloms, J.; Bortone, A.; Boyko, I.; Briere, R. A.; Cai, H.; Cai, X.; Calcaterra, A.; Cao, G. F.; Cao, N.; Cetin, S. A.; Chang, J. F.; Chang, W. L.; Chelkov, G.; Chen, D. Y.; Chen, G.; Chen, H. S.; Chen, M. L.; Chen, S. J.; Chen, X. R.; Chen, Y. B.; Chen, Z. J.; Cheng, W. S.; Cibinetto, G.; Cossio, F.; Cui, X. F.; Dai, H. L.; Dai, X. C.; Dbeyssi, A.; de Boer, R. E.; 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.; Dong, X.; Du, S. X.; Fan, Y. L.; Fang, J.; Fang, S. S.; Fang, Y.; Farinelli, R.; Fava, L.; Feldbauer, F.; Felici, G.; Feng, C. Q.; Feng, J. H.; Fritsch, M.; Fu, C. D.; Gao, Y.; Gao, Y.; Gao, Y.; Gao, Y. G.; Garzia, I.; Ge, P. 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doi:10.1103/PhysRevD.104.052009

Title: Measurement of the absolute branching fractions for purely leptonic $D_{s}^{+}$ decays

Journal Article · Tue Sep 21 00:00:00 EDT 2021 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.104.052009· OSTI ID:1821250

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ahmed, S.; Albrecht, M.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, X. H.; Bai, Y.; Bakina, O.; Baldini Ferroli, R.; Balossino, I.; Ban, Y.; Begzsuren, K.; Berger, N.; Bertani, M.; Bettoni, D.; Bianchi, F. more »

We report new measurements of the branching fraction B($$D^{+}_{s}$$ → ℓ⁺ν), where ℓ⁺ is either μ⁺ or τ⁺( → π⁺ $$\bar{ν}_{τ})$$, based on 6.32 fb^–1 of electron-positron annihilation data collected by the BESIII experiment at six center-of-mass energy points between 4.178 and 4.226 GeV. Simultaneously floating the $$D^{+}_{s} → μ^{+}ν_{μ}$$ and $$D^{+}_{s}$$ → τ⁺ν_τ components yields B($$D^{+}_{s} → τ^{+}ν_{τ})$$ = (5.21 ± 0.25 ± 0.17) × 10^–2, B($$D^{+}_{s}$$ → μ⁺ν_μ) = (5.35 ± 0.13 ± 0.16) × 10^–3, and the ratio of decay widths R = $$\frac{Γ(D^{+}_{s} → τ^{+}ν_{τ})}{Γ(D^{+}_{s} → μ^{+}ν_{μ})}$$ = $$9.73^{+ 0.61}_{– 0.58}$$ ± 0.36, where the first uncertainties are statistical and the second systematic. No evidence of CP asymmetry is observed in the decay rates $$D^{±}_{s}$$ → μ^±ν_μ and $$D^{±}_{s}$$ → τ^±ν_τ: A_CP(μ^±ν) = (–1.2 ± 2.5 ± 1.0)% and A_CP(τ^±ν) = (+2.9 ± 4.8 ± 1.0)%. Constraining our measurement to the Standard Model expectation of lepton universality (R = 9.75), we find the more precise results B($$D^{+}_{s}$$ → τ⁺ν_τ) = (5.22 ± 0.10 ± 0.14) × 10^–2 and A_CP(τ^±ν_τ) = (– 0.1 ± 1.9 ± 1.0)%. Combining our results with inputs external to our analysis, we determine the c → $$\bar{s}$$ quark mixing matrix element, $$D^{+}_{s}$$ decay constant, and ratio of the decay constants to be | V_cs | = 0.973 ± 0.009 ± 0.014, $$f_{D^{+}_{s}}$$ = 249.9 ± 2.4 ± 3.5 MeV, and $$f_{D^{+}_{s}}$$/$$f_{D^{+}}$$ = 1.232 ± 0.035, respectively.

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Research Organization:: Indiana Univ., Bloomington, IN (United States); Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Contributing Organization:: BESIII Collaboration

Grant/Contract Number:: FG02-05ER41374; SC-0012069; SC0012069

OSTI ID:: 1821250

Alternate ID(s):: OSTI ID: 1849643

Journal Information:: Physical Review D, Journal Name: Physical Review D Vol. 104 Journal Issue: 5; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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