Abstract
Lepton flavour is a conserved quantity in the standard model of particle physics, but it does not follow from an underlying gauge symmetry. After the discovery of neutrino oscillation, it has been established that lepton flavour is not conserved in the neutral sector. Thus the lepton sector is an excellent place to look for New Physics, and in this perspective the Charged Lepton Flavour Violation is interesting. Various extensions of the standard model predict lepton flavour violating decays that can be observed at LHC. This report summarises several searches for lepton flavour violation with data collected by the CMS detector.
Highlights
Lepton flavour conservation in the standard model (SM) of particle physics does not follow from any underlying gauge symmetry
To fully test supersymmetric naturalness, searches for all possible decay chains should be carried out. These can be broadly categorized as R-parity conserving (RPC) or violating (RPV) scenarios, where R-parity is defined by R = (−1)3B+L+2s, where B and L are the baryon and lepton numbers, and s is the spin of the particle
A search for heavy resonances decaying into eμ final states has been performed using an integrated luminosity of 2.7 fb−1 of 13 TeV proton-proton collision data recorded with the CMS detector in 2015 [5]
Summary
Lepton flavour conservation in the standard model (SM) of particle physics does not follow from any underlying gauge symmetry. In principle, charged lepton flavour violation (LFV) but the large mass di↵erence between neutrinos and heavy gauge bosons suppresses such interactions to orders of magnitude, which is immeasurable by any existing experimental setup. Charged LVF processes can be directly related to neutrino masses and mixing and are very promising to find evidence for physics beyond the SM. Search for heavy majorana neutrinos and R-parity violating (RPV) supersymmetry (SUSY) are important. Another interesting scenario is where LFV Higgs boson decays become amplified in models assuming the validity of the SM only up to a finite scale. Some of the important searches related to charged LFV with the CMS experiment is described in brief
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