10–14 Apr 2023
Europe/Zurich timezone

Impact of ΛbΛcτν measurement on New Physics in bclν transitions

12 Apr 2023, 18:40
5m

Speaker

Marco Fedele (KIT)

Description

Measurements of the branching ratios of BD()τν¯/BD()ν¯ and BcJ/ψτν¯/BcJ/ψν¯ by the BaBar, Belle and LHCb collaborations consistently point towards an abundance of taus compared to channels with light leptons. However, the ratio ΛbΛcτν¯/ΛbΛcν¯ shows a relative deficit in taus. The aim of this talk is to critically address whether data still points towards a coherent pattern of deviations, in particular in light of the sum rule relating these decays in a model-independent way. We find that no common new physics explanation of all ratios is possible within 2σ or 1.5σ, depending on the R(Λc) normalization to light lepton channels.

Primary author

Presentation materials

There are no materials yet.