Model-independent description of decays
Open Access
- 18 November 2024
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 110 (9)
Abstract
We introduce a new parametrization of B → D π ℓ ν form factors using a partial-wave expansion and derive bounds on the series coefficients using analyticity and unitarity. This is the first generalization of the model-independent formalism developed by Boyd, Grinstein, and Lebed for B → D ℓ ν to semileptonic decays with multihadron final states, and enables data-driven form-factor determinations with robust, systematically improvable uncertainties. Using this formalism, we extract the form-factor parameters for B → D 2 * ( → D π ) ℓ ν decays in a model-independent way from fits of data from the Belle Experiment. We find that the semileptonic data are compatible with the presence of two poles in the D π S-wave channel, which is the scenario preferred by nonleptonic decays and unitarized chiral perturbation theory. Published by the American Physical Society 2024Keywords
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Funding Information
- U.S. Department of Energy (DE-AC02-07CH11359)
- Alexander von Humboldt-Stiftung
- Natural Sciences and Engineering Research Council of Canada
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