Search for lepton flavour violating decays of heavy resonances and quantum black holes to an e? pair in proton–proton collisions at ?s = 8 TeV

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dc.contributor.authorThe CMS Collaboration
dc.date.accessioned2025-03-07T20:00:24Z
dc.date.available2025-03-07T20:00:24Z
dc.date.issued2016
dc.departmentÇağ Üniversitesi
dc.description.abstractA search for narrow resonances decaying to an electron and a muon is presented. The e? 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 e? 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 ? sneutrino in R-parity violating supersymmetry is considered. The ? sneutrino is excluded for masses below 1.28 TeV for couplings ?132= ?231= ?311 ?= 0.01 , and below 2.30 TeV for ?132= ?231= 0.07 and ?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? mass spectrum excludes QBH production below a threshold mass Mth 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? final state. © 2016, CERN for the benefit of the CMS collaboration.
dc.identifier.doi10.1140/epjc/s10052-016-4149-y
dc.identifier.issn1434-6044
dc.identifier.issue6
dc.identifier.scopus2-s2.0-84978791338
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1140/epjc/s10052-016-4149-y
dc.identifier.urihttps://hdl.handle.net/20.500.12507/2557
dc.identifier.volume76
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherSpringer Nature
dc.relation.ispartofEuropean Physical Journal C
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_20241226
dc.titleSearch for lepton flavour violating decays of heavy resonances and quantum black holes to an e? pair in proton–proton collisions at ?s = 8 TeV
dc.typeArticle

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