Search for lepton flavour violating decays of heavy resonances and quantum black holes to an e-mu pair in proton-proton collisions at sqrt(s) = 8 TeV

Abstract

A search for narrow resonances decaying to an electron and a muon is presented. The e-mu mass spectrum is also investigated for non-resonant contributions from the production of quantum black holes (QBHs). The analysis is performed using data corresponding to an integrated luminosity of 19.7 inverse femtobarns collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. With no evidence for physics beyond the standard model in the invariant mass spectrum of selected e-mu pairs, upper limits are set at 95% confidence level on the product of cross section and branching fraction for signals arising in theories with charged lepton flavour violation. In the search for narrow resonances, the resonant production of a tau sneutrino in R-parity violating supersymmetry is considered. The tau sneutrino is excluded for masses below 1.28 TeV for couplings lambda[132] = lambda[231] = lambda'[311] = 0.01, and below 2.30 TeV for lambda[132] = lambda[231] = 0.07 and lambda'[311] = 0.11. These are the most stringent limits to date from direct searches at high-energy colliders. In addition, the resonance searches are interpreted in terms of a model with heavy partners of the Z boson and the photon. In a framework of TeV-scale quantum gravity based on a renormalization of Newton's constant, the search for non-resonant contributions to the e-mu mass spectrum excludes QBH production below a threshold mass M[th] of 1.99 TeV. In models that invoke extra dimensions, the bounds range from 2.36 TeV for one extra dimension to 3.63 TeV for six extra dimensions. This is the first search for QBHs decaying into the e-mu final state.

arXiv commentReplaced with published version. Added the journal reference and DOI. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/EXO-13-002/index.html

References in corpus (57)

• A Large Mass Hierarchy from a Small Extra Dimension
• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• An Alternative to Compactification
• The Hierarchy Problem and New Dimensions at a Millimeter
• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• Big-Bang Nucleosynthesis
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• MadGraph 5 : Going Beyond
• Phenomenology, Astrophysics and Cosmology of Theories with Sub-Millimeter Dimensions and TeV Scale Quantum Gravity
• New parton distributions for collider physics
• The total top quark pair production cross-section at hadron colliders through O(alpha_S^4)
• R-parity violating supersymmetry
• CalcHEP 3.4 for collider physics within and beyond the Standard Model
• Black Holes at the LHC
• Pileup subtraction using jet areas
• High Energy Colliders as Black Hole Factories: The End of Short Distance Physics
• MCFM for the Tevatron and the LHC
• Performance of CMS muon reconstruction in pp collision events at sqrt(s) = 7 TeV
• Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at sqrt(s) = 8 TeV
• The PDF4LHC Working Group Interim Recommendations
• Combining QCD and electroweak corrections to dilepton production in FEWZ
• Search for high-mass dilepton resonances in pp collisions at sqrt(s) = 8 TeV with the ATLAS detector
• Search for new phenomena in the dijet mass distribution using $p-p$ collision data at $\sqrt{s}=8$ TeV with the ATLAS detector
• Measurements of Inclusive W and Z Cross Sections in pp Collisions at sqrt(s)=7 TeV
• The PDF4LHC Working Group Interim Report
• A Model for High Energy Scattering in Quantum Gravity
• Search for resonances and quantum black holes using dijet mass spectra in proton-proton collisions at sqrt(s) = 8 TeV
• Search for narrow resonances decaying to dijets in proton-proton collisions at sqrt(s) = 13 TeV
• Search for New Phenomena in Dijet Mass and Angular Distributions from $pp$ Collisions at $\sqrt{s}$ = 13 TeV with the ATLAS Detector
• Search for physics beyond the standard model in dilepton mass spectra in proton-proton collisions at sqrt(s) = 8 TeV
• Pileup subtraction for jet shapes
• Black Holes and Quantum Gravity at the LHC
• Colorful quantum black holes at the LHC
• Quantum gravity at a TeV and the renormalization of Newton's constant
• Search for narrow resonances in dilepton mass spectra in pp collisions at sqrt(s) = 7 TeV
• Search for microscopic black holes in pp collisions at sqrt(s) = 8 TeV
• Quantum black holes with charge, colour, and spin at the LHC
• Dualities versus Singularities
• NNNLO soft-gluon corrections for the top-quark $p_T$ and rapidity distributions
• Search for new phenomena in photon+jet events collected in proton--proton collisions at sqrt(s) = 8 TeV with the ATLAS detector
• Supersymmetric NLO QCD Corrections to Resonant Slepton Production and Signals at the Tevatron and the LHC
• Search for Quantum Black-Hole Production in High-Invariant-Mass Lepton+Jet Final States Using Proton-Proton Collisions at sqrt(s) = 8 TeV and the ATLAS Detector
• The Lightest of Black Holes
• Search for a Heavy Neutral Particle Decaying to $e\mu$, $e\tau$, or $\mu \tau$ in $pp$ Collisions at $\sqrt{s}=8$ TeV with the ATLAS Detector
• A review of Quantum Gravity at the Large Hadron Collider
• Fermions in the vortex background on a sphere
• Search for new phenomena with photon+jet events in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for sneutrino production in emu final states in 5.3 fb^-1 of ppbar collisions at sqrt(s) =1.96 TeV
• Search for R-parity Violating Decays of tau Sneutrinos to emu, mutau, and etau Pairs in ppbar Collisions at sqrt(s) = 1.96 TeV
• Differential and total cross sections for top pair and single top production
• Flavour violation with a single generation
• Searching for family-number conserving neutral gauge bosons from extra dimensions
• Sneutrino as Lightest Supersymmetric Particle in B3 mSUGRA Models and Signals at the LHC
• A way to crosscheck $\mu$-$e$ conversion in the case of no signals of $\mu \to e\gamma$ and $\mu \to 3e$

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