# General Seminar Miniworkshop Congiunto INFN LNF - INFN Roma: New results on theoretically clean observables in rare B-meson decays from LHCb

May 5, 2021
Piattaforma Cisco Webex
Europe/Rome timezone

### Support

Aim of the meeting:

Over the past decade, measurements involving the flavour changing neutral current transition $b\to s\ell^+\ell^-$ have shown tantalising tensions with Standard Model (SM) predictions. However, our current understanding of the hadronic uncertainties in these predictions hinders our ability to interpret these as physics beyond the SM. In order to resolve this impasse, measurements of observables that are theoretically pristine in processes that are accidentally suppressed in the SM are of paramount importance. Observables in $B^0_{s}\to\mu^+\mu^-$ decays as well a lepton flavour universality tests in $B^+\to K^+\ell^+\ell^-$ transitions are perfect examples of such measurements. In this mini-workshop, we will present the latest results in $B^0_{s}\to\mu^+\mu^-$ decays and the updated measurement of $R_K=BR(B^+\to K^+μ^+μ^−)/BR(B^+\to K^+e^+e^−)$ using the complete dataset collected by the LHCb experiment, and we will discuss the theoretical implications.

Program

Wednesday May 5

14:30
"Introduction"

14:40   Marco Santimaria  (LNF INFN)
"Measurement of $B^0 \to μ^+μ^−$ decays with Run 1 + Run 2 data"

15:20   Flavio Archilli (University of Heidelberg, Germany)
"Precision tests of the Standard Model with $b → sl^+l^-$ decay"

16:00 Gino Isidori (University of Zurich, Switzerland)

"Theoretical implications of recent measurements of B-meson decays"

16:40 General Discussion

17:00 Conclusion

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Meeting number (access code): 163 349 9870

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