HEP Colloquia 2021

by Prof. Francesco Dettori

Wednesday 12 May 2021, 14:30 → 16:30 Europe/Rome

Online

Rare B decays as doors to new physics: new results from LHCb

Hadron decays with a change in quark flavour without change in electric charge are rare in the Standard Model of particle physics, but can be strongly enhanced if new particles exist that can mediate these processes. Rare decays of B mesons are thus sensitive probes of new physics interactions, especially as they have precise predictions in the Standard Model.
In recent years, evidence has been building up of a possible discrepancy in several of these decays with respect to the Standard Model predictions, pointing towards possible common explanations involving new vector currents, and most interestingly hinting at a possible violation of lepton flavour universality in these processes.
The LHCb experiment taking data at the Large Hadron Collider is a key player in these measurements.
In this seminar measurements on rare B decays from the LHCb experiment will be presented with a focus on the recent updates of the $B^0_s-> \mu^+ \mu^-$ decay and of the $R_K = B^+ -> K^+ \mu^+ \mu^- /B^+ -> K^+ e^+ e^-$ observable. A short review on the implications of these measurements on possible new physics beyond the Standard Model will also be given.

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