Abstract
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.
- Received 21 April 2019
- Corrected 17 February 2021
DOI:https://doi.org/10.1103/PhysRevD.100.052007
Published by the American Physical Society under the terms of the 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.
Published by the American Physical Society
Physics Subject Headings (PhySH)
Corrections
17 February 2021
Correction: Equations (7), (20), and (27) contained errors and have been fixed. The captions and headings in Tables XXXII and XXXIII were switched and have been fixed.