Study of Anomalies in Exclusive Semileptonic B Decays
Vincenzo Afferrante, Guido Martinelli
TL;DR
This paper analyzes anomalies in exclusive semileptonic B decays, focusing on Vcb extraction, form factor parameterizations, and potential new physics effects, highlighting discrepancies with Standard Model predictions.
Contribution
It compares different form factor parameterizations and investigates the impact of new physics operators on semileptonic B decay anomalies.
Findings
Discrepancy between inclusive and exclusive Vcb determinations.
Experimental tau decay ratios exceed Standard Model predictions.
Potential new physics effects could explain observed anomalies.
Abstract
Our Vcb extraction is based on recent Belle results, with unfolded kinematical dependence. We use two different parameterizations of the form factors, the CLN and BGL parameterizations. We discuss how the known discrepancy between the inclusive and exclusive determinations of Vcb depends on an underestimate of the uncertainty with parameterizations that use heavy quark expansion. We investigate the results of the semileptonic B decay with heavy leptons (tau) compared to the decays into light leptons. Experimental ratio of the two branching ratios is systematically larger than the Standard Model(SM) prediction. Effects of new physics operators on the data about these decays are studied.
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