CMS-PAS-EXO-13-002

CMS-PAS-EXO-13-002
Search for Lepton Flavour Violating Decays of Heavy Resonances and Quantum Black Holes to electron/muon Pairs in pp Collisions at a centre of mass energy of 8 TeV
CMS Collaboration
March 2015

Abstract: A search for heavy states decaying into the e$\mu$ final state has been performed using an integrated luminosity of 19.7 fb$^{-1}$ of 8 TeV proton-proton collision data recorded with the CMS detector at the LHC. No evidence for physics beyond the Standard Model is observed in the invariant mass spectrum of selected e$\mu$ pairs. 95% CL upper limits are set on the cross section times branching ratio of different signals arising in theories of new physics with lepton flavour violation in interactions involving charged leptons. In the framework of TeV-scale quantum gravity from a renormalization of Newton's constant, exclusion limits are set on the production threshold of quantum black holes for threshold masses below 1.99 TeV, and in extra-dimensional models the bounds range from 2.36 TeV for one extra dimension to 3.63 TeV for six extra dimensions. Scenarios of resonant tau sneutrino LSP production in R-parity violating supersymmetry are excluded for LSP masses below 1.28 TeV for couplings $\lambda_{132}=\lambda'_{311}=0.01$ and below 2.11 TeV for $\lambda_{132}=0.05$ and $\lambda'_{311}=0.1$.
Links: CDS record (PDF) ; inSPIRE record ; Public twiki page ; CADI line (restricted) ; Figures are available from the CDS record. These preliminary results are superseded in this paper, EPJC 76 (2016) 317.

Compact Muon Solenoid
LHC, CERN