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Measurement of the branching fraction of leptonic decay Ds+→τ+ντ via τ+→π+π0ν¯τ

M. Ablikim1, M. N. Achasov10,b, P. Adlarson67, S. Ahmed15, M. Albrecht4, R. Aliberti28, A. Amoroso66a,66c, M. R. An32, Q. An63,49 et al. (BESIII Collaboration)

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Ke43,1, I. K. Keshk4, A. Khoukaz60, P. Kiese28, R. Kiuchi1, R. Kliemt11, L. Koch30, O. B. Kolcu53a,d, B. Kopf4, M. Kuemmel4, M. Kuessner4, A. Kupsc67, M. G. Kurth1,54, W. Kühn30, J. J. Lane58, J. S. Lange30, P. Larin15, A. Lavania21, L. Lavezzi66a,66c, Z. H. Lei63,49, H. Leithoff28, M. Lellmann28, T. Lenz28, C. Li39, C. H. Li32, Cheng Li63,49, D. M. Li71, F. Li1,49, G. Li1, H. Li43, H. Li63,49, H. B. Li1,54, H. J. Li16, J. L. Li41, J. Q. Li4, J. S. Li50, Ke Li1, L. K. Li1, Lei Li3, P. R. Li31,l,m, S. Y. Li52, W. D. Li1,54, W. G. Li1, X. H. Li63,49, X. L. Li41, Xiaoyu Li1,54, Z. Y. Li50, H. Liang63,49, H. Liang1,54, H. Liang27, Y. F. Liang45, Y. T. Liang25, G. R. Liao12, L. Z. Liao1,54, J. Libby21, C. X. Lin50, B. J. Liu1, C. X. Liu1, D. Liu15,63, F. H. Liu44, Fang Liu1, Feng Liu6, H. B. Liu13, H. M. Liu1,54, Huanhuan Liu1, Huihui Liu17, J. B. Liu63,49, J. L. Liu64, J. Y. Liu1,54, K. Liu1, K. Y. Liu33, L. Liu63,49, M. H. Liu9,g, P. L. Liu1, Q. Liu68, Q. Liu54, S. B. 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Tang50, J. X. Teng63,49, V. Thoren67, W. H. Tian43, Y. T. Tian25, I. Uman53b, B. Wang1, C. W. Wang35, D. Y. Wang38,i, H. J. Wang31,l,m, H. P. Wang1,54, K. Wang1,49, L. L. Wang1, M. Wang41, M. Z. Wang38,i, Meng Wang1,54, W. Wang50, W. H. Wang68, W. P. Wang63,49, X. Wang38,i, X. F. Wang31,l,m, X. L. Wang9,g, Y. Wang63,49, Y. Wang50, Y. D. Wang37, Y. F. Wang1,49,54, Y. Q. Wang1, Y. Y. Wang31,l,m, Z. Wang1,49, Z. Y. Wang1, Ziyi Wang54, Zongyuan Wang1,54, D. H. Wei12, F. Weidner60, S. P. Wen1, D. J. White58, U. Wiedner4, G. Wilkinson61, M. Wolke67, L. Wollenberg4, J. F. Wu1,54, L. H. Wu1, L. J. Wu1,54, X. Wu9,g, Z. Wu1,49, L. Xia63,49, H. Xiao9,g, S. Y. Xiao1, Z. J. Xiao34, X. H. Xie38,i, Y. G. Xie1,49, Y. H. Xie6, T. Y. Xing1,54, G. F. Xu1, Q. J. Xu14, W. Xu1,54, X. P. Xu46, Y. C. Xu54, F. Yan9,g, L. Yan9,g, W. B. Yan63,49, W. C. Yan71, Xu Yan46, H. J. Yang42,f, H. X. Yang1, L. Yang43, S. L. Yang54, Y. X. Yang12, Yifan Yang1,54, Zhi Yang25, M. Ye1,49, M. H. Ye7, J. H. Yin1, Z. Y. 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Zhou32, A. N. Zhu1,54, J. Zhu36, K. Zhu1, K. J. Zhu1,49,54, S. H. Zhu62, T. J. Zhu69, W. J. Zhu36, W. J. Zhu9,g, Y. C. Zhu63,49, Z. A. Zhu1,54, B. S. Zou1, and J. H. Zou1 (BESIII Collaboration)

  • 1Institute of High Energy Physics, Beijing 100049, People’s Republic of China
  • 2Beihang University, Beijing 100191, People’s Republic of China
  • 3Beijing Institute of Petrochemical Technology, Beijing 102617, People’s Republic of China
  • 4Bochum Ruhr-University, D-44780 Bochum, Germany
  • 5Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
  • 6Central China Normal University, Wuhan 430079, People’s Republic of China
  • 7China Center of Advanced Science and Technology, Beijing 100190, People’s Republic of China
  • 8COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan
  • 9Fudan University, Shanghai 200443, People’s Republic of China
  • 10G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia
  • 11GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany
  • 12Guangxi Normal University, Guilin 541004, People’s Republic of China
  • 13Guangxi University, Nanning 530004, People’s Republic of China
  • 14Hangzhou Normal University, Hangzhou 310036, People’s Republic of China
  • 15Helmholtz Institute Mainz, Staudinger Weg 18, D-55099 Mainz, Germany
  • 16Henan Normal University, Xinxiang 453007, People’s Republic of China
  • 17Henan University of Science and Technology, Luoyang 471003, People’s Republic of China
  • 18Huangshan College, Huangshan 245000, People’s Republic of China
  • 19Hunan Normal University, Changsha 410081, People’s Republic of China
  • 20Hunan University, Changsha 410082, People’s Republic of China
  • 21Indian Institute of Technology Madras, Chennai 600036, India
  • 22Indiana University, Bloomington, Indiana 47405, USA
  • 23aINFN Laboratori Nazionali di Frascati, I-00044, Frascati, Italy
  • 23bINFN Laboratori Nazionali di Frascati, INFN Sezione di Perugia, I-06100, Perugia, Italy
  • 23cINFN Laboratori Nazionali di Frascati, University of Perugia, I-06100, Perugia, Italy
  • 24aINFN Sezione di Ferrara, INFN Sezione di Ferrara, I-44122, Ferrara, Italy
  • 24bINFN Sezione di Ferrara, University of Ferrara, I-44122, Ferrara, Italy
  • 25Institute of Modern Physics, Lanzhou 730000, People’s Republic of China
  • 26Institute of Physics and Technology, Peace Ave. 54B, Ulaanbaatar 13330, Mongolia
  • 27Jilin University, Changchun 130012, People’s Republic of China
  • 28Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany
  • 29Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia
  • 30Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
  • 31Lanzhou University, Lanzhou 730000, People’s Republic of China
  • 32Liaoning Normal University, Dalian 116029, People’s Republic of China
  • 33Liaoning University, Shenyang 110036, People’s Republic of China
  • 34Nanjing Normal University, Nanjing 210023, People’s Republic of China
  • 35Nanjing University, Nanjing 210093, People’s Republic of China
  • 36Nankai University, Tianjin 300071, People’s Republic of China
  • 37North China Electric Power University, Beijing 102206, People’s Republic of China
  • 38Peking University, Beijing 100871, People’s Republic of China
  • 39Qufu Normal University, Qufu 273165, People’s Republic of China
  • 40Shandong Normal University, Jinan 250014, People’s Republic of China
  • 41Shandong University, Jinan 250100, People’s Republic of China
  • 42Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
  • 43Shanxi Normal University, Linfen 041004, People’s Republic of China
  • 44Shanxi University, Taiyuan 030006, People’s Republic of China
  • 45Sichuan University, Chengdu 610064, People’s Republic of China
  • 46Soochow University, Suzhou 215006, People’s Republic of China
  • 47South China Normal University, Guangzhou 510006, People’s Republic of China
  • 48Southeast University, Nanjing 211100, People’s Republic of China
  • 49State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China
  • 50Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China
  • 51Suranaree University of Technology, University Avenue 111, Nakhon Ratchasima 30000, Thailand
  • 52Tsinghua University, Beijing 100084, People’s Republic of China
  • 53aTurkish Accelerator Center Particle Factory Group, Istanbul Bilgi University, HEP Res. Cent., 34060 Eyup, Istanbul, Turkey
  • 53bTurkish Accelerator Center Particle Factory Group, Near East University, Nicosia, North Cyprus, Mersin 10, Turkey
  • 54University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
  • 55University of Groningen, NL-9747 AA Groningen, The Netherlands
  • 56University of Hawaii, Honolulu, Hawaii 96822, USA
  • 57University of Jinan, Jinan 250022, People’s Republic of China
  • 58University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
  • 59University of Minnesota, Minneapolis, Minnesota 55455, USA
  • 60University of Muenster, Wilhelm-Klemm-Str. 9, 48149 Muenster, Germany
  • 61University of Oxford, Keble Rd, Oxford, United Kingdom OX13RH
  • 62University of Science and Technology Liaoning, Anshan 114051, People’s Republic of China
  • 63University of Science and Technology of China, Hefei 230026, People’s Republic of China
  • 64University of South China, Hengyang 421001, People’s Republic of China
  • 65University of the Punjab, Lahore-54590, Pakistan
  • 66aUniversity of Turin and INFN, University of Turin, I-10125, Turin, Italy
  • 66bUniversity of Turin and INFN, University of Eastern Piedmont, I-15121, Alessandria, Italy
  • 66cUniversity of Turin and INFN, INFN, I-10125, Turin, Italy
  • 67Uppsala University, Box 516, SE-75120 Uppsala, Sweden
  • 68Wuhan University, Wuhan 430072, People’s Republic of China
  • 69Xinyang Normal University, Xinyang 464000, People’s Republic of China
  • 70Zhejiang University, Hangzhou 310027, People’s Republic of China
  • 71Zhengzhou University, Zhengzhou 450001, People’s Republic of China

  • aAlso at the Moscow Institute of Physics and Technology, Moscow 141700, Russia.
  • bAlso at the Novosibirsk State University, Novosibirsk, 630090, Russia.
  • cAlso at the NRC “Kurchatov Institute”, PNPI, 188300, Gatchina, Russia.
  • dCurrently at Istanbul Arel University, 34295 Istanbul, Turkey.
  • eAlso at Goethe University Frankfurt, 60323 Frankfurt am Main, Germany.
  • fAlso at Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education; Shanghai Key Laboratory for Particle Physics and Cosmology; Institute of Nuclear and Particle Physics, Shanghai 200240, People’s Republic of China.
  • gAlso at Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443, People’s Republic of China.
  • hAlso at Harvard University, Department of Physics, Cambridge, Massachusetts, 02138, USA.
  • iAlso at State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, People’s Republic of China.
  • jAlso at School of Physics and Electronics, Hunan University, Changsha 410082, China.
  • kAlso at Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China.
  • lAlso at Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou 730000, People’s Republic of China.
  • mAlso at Lanzhou Center for Theoretical Physics, Lanzhou University, Lanzhou 730000, People’s Republic of China.
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Phys. Rev. D 104, 032001 – Published 13 August, 2021

DOI: https://doi.org/10.1103/PhysRevD.104.032001

Abstract

By analyzing 6.32  fb−1 of e+e− annihilation data collected at the center-of-mass energies between 4.178 and 4.226 GeV with the BESIII detector, we determine the branching fraction of the leptonic decay Ds+→τ+ντ, with τ+→π+π0ν¯τ, to be BDs+→τ+ντ=(5.29±0.25stat±0.20syst)%. We estimate the product of the Cabibbo-Kobayashi-Maskawa matrix element |Vcs| and the Ds+ decay constant fDs+ to be fDs+|Vcs|=(244.8±5.8stat±4.8syst)  MeV, using the known values of the τ+ and Ds+ masses as well as the Ds+ lifetime, together with our branching fraction measurement. Combining the value of |Vcs| obtained from a global fit in the standard model and fDs+ from lattice quantum chromodynamics, we obtain fDs+=(251.6±5.9stat±4.9syst)  MeV and |Vcs|=0.980±0.023stat±0.019syst. Using the branching fraction of BDs+→μ+νμ=(5.35±0.21)×10−3, we obtain the ratio of the branching fractions BDs+→τ+ντ/BDs+→μ+νμ=9.89±0.71, which is consistent with the standard model prediction of lepton flavor universality.

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Phys. Rev. D 104, 032001– Published 13 August, 2021
  • Received 17 May 2021
  • Accepted 7 July 2021
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