Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Measurement of the absolute branching fractions for purely leptonic Ds+ decays. / The BESIII Collaboration.
в: Physical Review D, Том 104, № 5, 052009, 01.09.2021.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Measurement of the absolute branching fractions for purely leptonic Ds+ decays
AU - BESIII Collaboration
AU - Ablikim, M.
AU - Achasov, M. N.
AU - Adlarson, P.
AU - Ahmed, S.
AU - Albrecht, M.
AU - Aliberti, R.
AU - Amoroso, A.
AU - An, M. R.
AU - An, Q.
AU - Bai, X. H.
AU - Bai, Y.
AU - Bakina, O.
AU - Baldini Ferroli, R.
AU - Balossino, I.
AU - Ban, Y.
AU - Begzsuren, K.
AU - Berger, N.
AU - Bertani, M.
AU - Bettoni, D.
AU - Bianchi, F.
AU - Bloms, J.
AU - Bortone, A.
AU - Boyko, I.
AU - Briere, R. A.
AU - Cai, H.
AU - Cai, X.
AU - Calcaterra, A.
AU - Cao, G. F.
AU - Cao, N.
AU - Cetin, S. A.
AU - Chang, J. F.
AU - Chang, W. L.
AU - Chelkov, G.
AU - Chen, D. Y.
AU - Chen, G.
AU - Chen, H. S.
AU - Chen, M. L.
AU - Chen, S. J.
AU - Chen, X. R.
AU - Chen, Y. B.
AU - Chen, Z. J.
AU - Cheng, W. S.
AU - Cibinetto, G.
AU - Cossio, F.
AU - Cui, X. F.
AU - Dai, H. L.
AU - Dai, X. C.
AU - Dbeyssi, A.
AU - Muchnoi, N. Yu
AU - Nikolaev, I. B.
N1 - Funding Information: The BESIII Collaboration thanks the staff of BEPCII and the computing center for their hard efforts. This work is supported in part by National Key Research and Development Program of China under Contracts No. 2020YFA0406400, No. 2020YFA0406300; National Natural Science Foundation of China (NSFC) under Contracts No. 11625523, No. 11635010, No. 11735014, No. 11822506, No. 11835012, No. 11935015, No. 11935016, No. 11935018, No. 11961141012; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No. U1732263, No. U1832207; CAS Key Research Program of Frontier Sciences under Contracts No. QYZDJ-SSW-SLH003, No. QYZDJ-SSW-SLH040; 100 Talents Program of CAS; INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology; ERC under Contract No. 758462; European Union Horizon 2020 research and innovation programme under Marie Sklodowska-Curie Grant Agreement No. 894790; German Research Foundation DFG under Contracts No. 443159800, Collaborative Research Center CRC 1044, No. FOR 2359, No. FOR 2359, GRK 214; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Science and Technology fund; Olle Engkvist Foundation under Contract No. 200-0605; STFC (United Kingdom); The Knut and Alice Wallenberg Foundation (Sweden) under Contract No. 2016.0157; The Royal Society, UK under Contracts No. DH140054, No. DH160214; The Swedish Research Council; U.S. Department of Energy under Contracts No. DE-FG02-05ER41374, No. DE-SC-0012069. Publisher Copyright: © 2021 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.
PY - 2021/9/1
Y1 - 2021/9/1
N2 - We report new measurements of the branching fraction B(Ds+→ℓ+ν), where is either μ+ or τ+(→π+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 Ds+→μ+νμ and Ds+→τ+ντ components yields B(Ds+→τ+ντ)=(5.21±0.25±0.17)×10-2, B(Ds+→μ+νμ)=(5.35±0.13±0.16)×10-3, and the ratio of decay widths R=Γ(Ds+→τ+ντ)Γ(Ds+→μ+νμ)=9.73-0.58+0.61±0.36, where the first uncertainties are statistical and the second systematic. No evidence of CP asymmetry is observed in the decay rates Ds±→μ±νμ and Ds±→τ±ντ: ACP(μ±ν)=(-1.2±2.5±1.0)% and ACP(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(Ds+→τ+ντ)=(5.22±0.10±0.14)×10-2 and ACP(τ±ντ)=(-0.1±1.9±1.0)%. Combining our results with inputs external to our analysis, we determine the c→s¯ quark mixing matrix element, Ds+ decay constant, and ratio of the decay constants to be |Vcs|=0.973±0.009±0.014, fDs+=249.9±2.4±3.5 MeV, and fDs+/fD+=1.232±0.035, respectively.
AB - We report new measurements of the branching fraction B(Ds+→ℓ+ν), where is either μ+ or τ+(→π+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 Ds+→μ+νμ and Ds+→τ+ντ components yields B(Ds+→τ+ντ)=(5.21±0.25±0.17)×10-2, B(Ds+→μ+νμ)=(5.35±0.13±0.16)×10-3, and the ratio of decay widths R=Γ(Ds+→τ+ντ)Γ(Ds+→μ+νμ)=9.73-0.58+0.61±0.36, where the first uncertainties are statistical and the second systematic. No evidence of CP asymmetry is observed in the decay rates Ds±→μ±νμ and Ds±→τ±ντ: ACP(μ±ν)=(-1.2±2.5±1.0)% and ACP(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(Ds+→τ+ντ)=(5.22±0.10±0.14)×10-2 and ACP(τ±ντ)=(-0.1±1.9±1.0)%. Combining our results with inputs external to our analysis, we determine the c→s¯ quark mixing matrix element, Ds+ decay constant, and ratio of the decay constants to be |Vcs|=0.973±0.009±0.014, fDs+=249.9±2.4±3.5 MeV, and fDs+/fD+=1.232±0.035, respectively.
UR - http://www.scopus.com/inward/record.url?scp=85116451311&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.104.052009
DO - 10.1103/PhysRevD.104.052009
M3 - Article
AN - SCOPUS:85116451311
VL - 104
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 5
M1 - 052009
ER -
ID: 34374936