Measurement of the CKM matrix element from at Belle
We present a new measurement of the Cabibbo-Kobayashi-Maskawa matrix element from decays, reconstructed with the full Belle data set of integrated luminosity. Two form factor parametrizations, originally conceived by the Caprini-Lellouch-Neubert (CLN) and the Boyd, Grinstein and Lebed (BGL) groups, are used to extract the product and the decay form factors, where is the normalization factor and is a small electroweak correction. In the CLN parametrization we find , , , . For the BGL parametrization we obtain , which is consistent with the world average when correcting for . The branching fraction of is measured to be . We also present a new test of lepton flavor universality violation in semileptonic decays, . The errors quoted correspond to the statistical and systematic uncertainties, respectively. This is the most precise measurement of and form factors to date and the first experimental study of the BGL form factor parametrization in an experimental measurement.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); Univ. of Hawaii, Honolulu, HI (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); KEK - High Energy Accelerator Research Organization; Ministry of Education, Culture, Sports, Science and Technology
- Contributing Organization:
- Belle Collaboration
- Grant/Contract Number:
- SC0012704; SC0009973; SC0010504
- OSTI ID:
- 1561335
- Alternate ID(s):
- OSTI ID: 1569556; OSTI ID: 1593772; OSTI ID: 1787816
- Report Number(s):
- BNL-212157-2019-JAAM; BNL-221639-2021-JAAM; PRVDAQ; 052007
- Journal Information:
- Physical Review. D., Journal Name: Physical Review. D. Vol. 100 Journal Issue: 5; ISSN 2470-0010
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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