Excited muon search feasibility study using two muons plus photon signature at 14 TeV with the CMS experiment

Abstract EN

Within the Standard Model(SM) of particle physics, quarks and leptons are understood to be the fundamental particles and their existence have been verified experimentally.

A search for substructure of quarks or study of quark compositeness is carried out with the CMS detector at LHC, using 300 fb-1 of integrated luminosity at a center-of-mass energy s =14 TeV.

The discovery of excited muons (μ*) would be a first indication of lepton compositeness.

In the current study, μ is assumed to be produced via four - fermions contact interactions in association with a muon (μ) and to decay via the gauge mediated process μ →μ?, yielding a final state with two muons and one photon.

Monte Carlo (MC) samples are produced via MadGraph5 and PYTHIA 8 event generators.

To simulate the detector response, Delphes was used assuming the CMS detector configuration.

Objects and event selections are optimized in order to maximize the signal to SM background ratio.