Journal Club: Evidence of lepton universality violation in b-meson decays at LHCb

Fri., Apr. 9, 2021 3:30 p.m. - Fri., Apr. 9, 2021 4:30 p.m.

Location: Zoom

Abstract: The Standard Model of Particle Physics is by far the most effective model that explains the interaction of fundamental particles. It predicts that particles decaying into different flavours of charged leptons (electron, muon and tau) have identical electroweak interaction strength which is known as "Lepton Universality". This prediction has been confirmed previously by number of experiments. Large Hadron Collider beauty (LHCb) experiment at CERN has recently found evidence of violation of Lepton Universality by studying proton-proton collision data. This measurement was performed by analyzing decay of b-meason into a strange meson along with a charged lepton. The ratio of electron and muon production was measured in this decay and breaking of Lepton Universality was observed with a significance of 3.1 standard deviation. In this discussion, I will review the experimental setup, analysis technique and comparison of results with previous measurements.

Journal Article "Test of lepton universality in beauty-quark decays "

Speaker: Ali Usman, University of Regina