Data di Pubblicazione:
2021
Abstract:
We report new measurements of the branching fraction B(Dv), where lis either mu or tau (-> pi), based on 6.32 fbof 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 -> mu mu components yields B(D -> tau) = (5.21 +/- 0.25 +/- 0.17) x 102, B(D -> mu mu) (5.35 +/- 0.13 +/- 0.16) x 103, and the ratio of decay widths R = Gamma(D -> tau tau)/Gamma -> mu&m)= 9.73-0.58 +/- 0.36, where the first uncertainties are statistical and the second systematic. No evidence of CP asymmetry is observed in the decay rates Ds +/- -> mu +/- v mu and D +/- -> tau +/-= (+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 -> tau = (5.22 +/- 0.10 +/- 0.14) x 10-2and A(+/-) = (-0.1 +/- 1.9 +/- 1.0)%. Combining our results with inputs external to our analysis, we determine the C -> (S) over bar quark mixing matrix element, D+ decay constant, and ratio of the decay constants to be vertical bar V vertical bar = 0.973 +/- 0.009 +/- 0.014, f D+ = 249.9 +/- 2.4 +/- 3.5 MeV, and f D+ / f D = 1.232 +/- 0.035, respectively.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
M. Ablikim; M.???N. Achasov; P. Adlarson; S. Ahmed; M. Albrecht; R. Aliberti; A. Amoroso; M.???R. An; Q. An; X.???H. Bai; Y. Bai; O. Bakina; R. Baldini Ferroli; I. Balossino; Y. Ban; K. Begzsuren; N. Berger; M. Bertani; D. Bettoni; F. Bianchi; J. Bloms; A. Bortone; I. Boyko; R.???A. Briere; H. Cai; X. Cai; A. Calcaterra; G.???F. Cao; N. Cao; S.???A. Cetin; J.???F. Chang; W.???L. Chang; G. Chelkov; D.???Y. Chen; G. Chen; H.???S. Chen; M.???L. Chen; S.???J. Chen; X.???R. Chen; Y.???B. Chen; Z.???J. Chen; W.???S. Cheng; G. Cibinetto; F. Cossio; X.???F. Cui; H.???L. Dai; X.???C. Dai; A. Dbeyssi; R.???E. de Boer; D. Dedovich; Z.???Y. Deng; A. Denig; I. Denysenko; M. Destefanis; F. De Mori; Y. Ding; C. Dong; J. Dong; L.???Y. Dong; M.???Y. Dong; X. Dong; S.???X. Du; Y.???L. Fan; J. Fang; S.???S. Fang; Y. Fang; R. Farinelli; L. Fava; F. Feldbauer; G. Felici; C.???Q. Feng; J.???H. Feng; M. Fritsch; C.???D. Fu; Y. Gao; Y. Gao; Y. Gao; Y.???G. Gao; I. Garzia; P.???T. Ge; C. Geng; E.???M. Gersabeck; A. Gilman; K. Goetzen; L. Gong; W.???X. Gong; W. Gradl; M. Greco; L.???M. Gu; M.???H. Gu; S. Gu; Y.???T. Gu; C.???Y. Guan; A.???Q. Guo; L.???B. Guo; R.???P. Guo; Y.???P. Guo; A. Guskov; T.???T. Han; W.???Y. Han; X.???Q. Hao; F.???A. Harris; N. H??sken; K.???L. He; F.???H. Heinsius; C.???H. Heinz; T. Held; Y.???K. Heng; C. Herold; M. Himmelreich; T. Holtmann; Y.???R. Hou; Z.???L. Hou; H.???M. Hu; J.???F. Hu; T. Hu; Y. Hu; G.???S. Huang; L.???Q. Huang; X.???T. Huang; Y.???P. Huang; Z. Huang; T. Hussain; W. Ikegami Andersson; W. Imoehl; M. Irshad; S. Jaeger; S. Janchiv; Q. Ji; Q.???P. Ji; X.???B. Ji; X.???L. Ji; Y.???Y. Ji; H.???B. Jiang; X.???S. Jiang; J.???B. Jiao; Z. Jiao; S. Jin; Y. Jin; T. Johansson; N. Kalantar-Nayestanaki; X.???S. Kang; R. Kappert; M. Kavatsyuk; B.???C. Ke; I.???K. Keshk; A. Khoukaz; P. Kiese; R. Kiuchi; R. Kliemt; L. Koch; O.???B. Kolcu; B. Kopf; M. Kuemmel; M. Kuessner; A. Kupsc; M.???G. Kurth; W. K??hn; J.???J. Lane; J.???S. Lange; P. Larin; A. Lavania; L. Lavezzi; Z.???H. Lei; H. Leithoff; M. Lellmann; T. Lenz; C. Li; C.???H. Li; Cheng Li; D.???M. Li; F. Li; G. Li; H. Li; H. Li; H.???B. Li; H.???J. Li; H.???J. Li; J.???L. Li; J.???Q. Li; J.???S. Li; Ke Li; L.???K. Li; Lei Li; P.???R. Li; S.???Y. Li; W.???D. Li; W.???G. Li; X.???H. Li; X.???L. Li; Xiaoyu Li; Z.???Y. Li; H. Liang; H. Liang; H. Liang; Y.???F. Liang; Y.???T. Liang; G.???R. Liao; L.???Z. Liao; J. Libby; C.???X. Lin; B.???J. Liu; C.???X. Liu; D. Liu; F.???H. Liu; Fang Liu; Feng Liu; H.???B. Liu; H.???M. Liu; Huanhuan Liu; Huihui Liu; J.???B. Liu; J.???L. Liu; J.???Y. Liu; K. Liu; K.???Y. Liu; Ke Liu; L. Liu; M.???H. Liu; P.???L. Liu; Q. Liu; Q. Liu; S.???B. Liu; Shuai Liu; T. Liu; W.???M. Liu; X. Liu; Y. Liu; Y.???B. Liu; Z.???A. Liu; Z.???Q. Liu; X.???C. Lou; F.???X. Lu; F.???X. Lu; H.???J. Lu; J.???D. Lu; J.???G. Lu; X.???L. Lu; Y. Lu; Y.???P. Lu; C.???L. Luo; M.???X. Luo; P.???W. Luo; T. Luo; X.???L. Luo; S. Lusso; X.???R. Lyu; F.???C. Ma; H.???L. Ma; L.???L. Ma; M.???M. Ma; Q.???M. Ma; R.???Q. Ma; R.???T. Ma; X.???X. Ma; X.???Y. Ma; F.???E. Maas; M. Maggiora; S. Maldaner; S. Malde; Q.???A. Malik; A. Mangoni; Y.???J. Mao; Z.???P. Mao; S. Marcello; Z.???X. Meng; J.???G. Messchendorp; G. Mezzadri; T.???J. Min; R.???E. Mitchell; X.???H. Mo; Y.???J. Mo; N.???Yu. Muchnoi; H. Muramatsu; S. Nakhoul; Y. Nefedov; F. Nerling; I.???B. Nikolaev; Z. Ning; S. Nisar; S.???L. Olsen; Q. Ouyang; S. Pacetti; X. Pan; Y. Pan; A. Pathak; P. Patteri; M. Pelizaeus; H.???P. Peng; K. Peters; J. Pettersson; J.???L. Ping; R.???G. Ping; R. Poling; V. Prasad; H. Qi; H.???R. Qi; K.???H. Qi; M. Qi; T.???Y. Qi; T.???Y. Qi; S. Qian; W.???B. Qian; Z. Qian; C.???F. Qiao; L.???Q. Qin; X.???P. Qin; X.???S. Qin; Z.???H. Qin; J.???F. Qiu; S.???Q. Qu; K.???H. Rashid; K. Ravindran; C.???F. Redmer; A. Rivetti; V. Rodin; M. Rolo; G. Rong; Ch. Rosner; M. Rump; H.???S. Sang; A. Sarantsev; Y. Schelhaas; C. Schnier; K. Schoenning; M. Scodeggio; D.???C. Shan; W. Shan; X.???Y. Shan; J.???F. Shangguan; M.
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