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Title: Search for lepton flavour violating decays of heavy resonances and quantum black holes to an eμ pair in proton-proton collisions at √s = 8 TeV

Journal Article · · European Physical Journal. C, Particles and Fields
 [1]
  1. Yerevan Physics Inst. (YerPhI), Yerevan (Armenia). et al.
+ Show Author Affiliations

A search for narrow resonances decaying to an electron and a muon is presented. The eμ 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 fb -1 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 eμ 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 τ sneutrino in R-parity violating supersymmetry is considered. The τ sneutrino is excluded for masses below 1.28 TeV for couplings λ 132 = λ 231 = λ 311 ' = 0.01 , and below 2.30 TeV for λ 132 = λ 231 = 0.07 and λ 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 eμ 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 eμ final state.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
CMS Collaboration
Grant/Contract Number:
AC02-07CH11359; AC02-05CH11231
OSTI ID:
1256708
Alternate ID(s):
OSTI ID: 1411633
Report Number(s):
CMS-EXO-13-002; CERN-EP-2016-068; FERMILAB-PUB-16-203-CMS; arXiv:1604.05239; 1448302
Journal Information:
European Physical Journal. C, Particles and Fields, Vol. 76, Issue 6; ISSN 1434-6044
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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Cited By (4)

Search for lepton-flavor violating decays of heavy resonances and quantum black holes to eμ final states in proton-proton collisions at s = 13 $$ \sqrt{s}=13 $$ TeV journal April 2018
Creating and probing the Sachdev–Ye–Kitaev model with ultracold gases: Towards experimental studies of quantum gravity journal August 2017
Search for lepton-flavor violation in different-flavor, high-mass final states in p p collisions at s = 13     TeV with the ATLAS detector journal November 2018
Searching for left sneutrino LSP at the LHC journal July 2018

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