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Abstract: Determination of V cb in exclusive semileptonic decays is crucial consistencycheck against the V cb determined inclusively. Anticipated precision of V cb atthe Super Flavor factory is ~1%, with most of the theoretical error due tohadronic form factor uncertainties. However, at this level of precisiontreating electromagnetic effects becomes inevitable. In addition to virtualphoton corrections there are also emissions of real photons which are softenough to avoid detection. The bremsstrahlung part is completely universal andis accounted for in the experimental analyses. However, the so-called structuredependent contribution, which probes the hadronic content of the process and isinfrared finite, has been neglected so far. To this end, we estimated fractionof radiative events which are identified as semileptonic by experiment.



Autor: Damir Becirevic, Nejc Kosnik

Fuente: https://arxiv.org/







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