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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

CMS Collaboration; Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Hartl, C.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Knünz, V.; König, A.; ... mehr

Abstract (englisch):
A search for narrow resonances decaying to an electron and a muon is presented. The e μ 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 a τ sneutrino in R-parity violating supersymmetry is considered. The τ sneutrino is excluded for masses below 1.28 TeV for couplings λ₁₃₂ =λ₂₃₁ =λ ′₃₁₁ =0.01, and below 2.30 TeV for λ₁₃₂ =λ₂₃₁ =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 ... mehr

Zugehörige Institution(en) am KIT Institut für Experimentelle Kernphysik (IEKP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1140/epjc/s10052-016-4149-y
ISSN: 1434-6044
URN: urn:nbn:de:swb:90-595751
KITopen ID: 1000059575
Erschienen in The European physical journal / C
Band 76
Heft 6
Seiten 1-25
Lizenz CC BY 3.0 DE: Creative Commons Namensnennung 3.0 Deutschland
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
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