Seminars and Journal Clubs

# Unearthing the pattern of lepton flavour universality violation

## by Dr Abhishek Iyer (Institut de Physique des 2 Infinis de Lyon)

Europe/Brussels
1/3rd floor-E.349 - Seminar room (E.349) (Cyclotron (chemin du Cyclotron, 2, Louvain-la-Neuve))

### 1/3rd floor-E.349 - Seminar room (E.349)

#### Cyclotron (chemin du Cyclotron, 2, Louvain-la-Neuve)

30
Description

The Standard Model (SM) offers the best description of electroweak scale physics. While it has been tested at different levels to a great degree of accuracy there are several aspects that do not conform to its theoretical prediction. One such instance is the observation of Lepton Flavour universality violations in the semi-leptonic decays of B mesons. While this observation suggests a strong hint for beyond SM physics,  the verdict is yet to be out on the exact pattern of the explanation of these measurements: Either driven solely by the muons or involving a combination of both electrons and muons. With the aid of current and future experiments, we propose several checks in an attempt to unearth the nature of these anomalies. Correlation with different experiments and flavour sectors are facilitated by the assumption of minimal extension to the SM with a flavour symmetry. The correlations are developed for three frontiers of particle physics exploration. In order of increasing energy:
A) Low energy parity violation experiments: Measurements of Weak charge of the proton $Q_W^p$ and the  Caesium atom $Q_W^{Cs}$.
B) Rare Kaon decays at the ongoing NA62 experiment at CERN and KOTO at J-PARC.
C) Current and future pp colliders (LHC and FCC).
We demonstrate that, in addition to obtaining a broader understanding of the explanation of any experimental observation, such correlations can also serve to develop a synergy between different modes of exploration.