4.8 Article

Test of Lepton-Flavor Universality in B → K*l+l- Decays at Belle

期刊

PHYSICAL REVIEW LETTERS
卷 126, 期 16, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.161801

关键词

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资金

  1. Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan
  2. Japan Society for the Promotion of Science (JSPS)
  3. Tau-Lepton Physics Research Center of Nagoya University
  4. Australian Research Council [DP180102629, DP170102389, DP170102204, DP150103061, FT130100303]
  5. Austrian Science Fund (FWF)
  6. National Natural Science Foundation of China [11435013, 11475187, 11521505, 11575017, 11675166, 11705209]
  7. Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) [QYZDJ-SSW-SLH011]
  8. CAS Center for Excellence in Particle Physics (CCEPP)
  9. Shanghai Pujiang Program [18PJ1401000]
  10. Ministry of Education, Youth and Sports of the Czech Republic [LTT17020]
  11. Carl Zeiss Foundation
  12. Deutsche Forschungsgemeinschaft
  13. Excellence Cluster Universe
  14. VolkswagenStiftung
  15. Department of Science and Technology of India
  16. Istituto Nazionale di Fisica Nucleare of Italy
  17. National Research Foundation (NRF) of Korea [2016R1D1A1B01010135, 2016R1D1A1B02012900, 2018R1A2B3003643, 2018R1A6A1A06024970, 2018R1D1A1B07047294, 2019K1A3A7A09033840, 2019R1I1A3A01058933]
  18. Radiation Science Research Institute
  19. Foreign Large-size Research Facility Application Supporting project
  20. Global Science Experimental Data Hub Center of the Korea Institute of Science and Technology Information
  21. KREONET/GLORIAD
  22. Polish Ministry of Science and Higher Education
  23. National Science Center
  24. Ministry of Science and Higher Education of the Russian Federation [14.W03.31.0026]
  25. University of Tabuk (Saudi Arabia) [S-1440-0321, S-0256-1438, S-0280-1439]
  26. Slovenian Research Agency
  27. Ikerbasque, Basque Foundation for Science, Spain
  28. Swiss National Science Foundation
  29. Ministry of Education of Taiwan
  30. Ministry of Science and Technology of Taiwan
  31. U.S. Department of Energy
  32. National Science Foundation

向作者/读者索取更多资源

The study presents a measurement of R-K(*), including the branching fraction ratio for both charged and neutral B mesons. Absolute branching fractions for individual modes in different bins of the squared dilepton invariant mass were also reported. The obtained results are in line with standard model expectations.
We present a measurement of R-K(*), the branching fraction ratio B(B -> K* mu(+)mu(-))/B(B -> K* e(+) e(-)), for both charged and neutral B mesons. The ratio for the charged case RK*+ is the first measurement ever performed. In addition, we report absolute branching fractions for the individual modes in bins of the squared dilepton invariant mass q(2). The analysis is based on a data sample of 711 fb(-1), containing 772 x 10(6) B (B) over bar events, recorded at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The obtained results are consistent with standard model expectations.

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