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

Abstract

This Letter presents a search for a heavy neutral particle decaying into an opposite-sign different-flavor dilepton pair, $e^{\pm }{\mu }^{\mp }$, $e^{\pm }{\tau }^{\mp }$, or ${\mu }^{\pm }{\tau }^{\mp }$ using 20.3 fb${}^{-1}$ of $pp$ collision data at $\sqrt{s}=8$ TeV collected by the ATLAS detector at the LHC. The numbers of observed candidate events are compatible with the Standard Model expectations. Limits are set on the cross section of new phenomena in two scenarios: the production of ${\tilde{\nu }}_{\tau }$ in $R$-parity-violating supersymmetric models and the production of a lepton-flavor-violating $Z^{\prime }$ vector boson.

8 pages plus author list + cover pages (25 pages total), 2 figures, 1 tables, submitted to Physical Review Letters, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2013-06/

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• Experimental Status of Supersymmetry after the LHC Run-I
• Search for new phenomena in different-flavour high-mass dilepton final states in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Unified resolution of the $R(D)$ and $R(D^{\ast })$ anomalies and the lepton flavor violating decay $h\to \mu \tau$
• Thinking outside the beamspot: Other SUSY searches at the LHC (long-lived particles and R-parity violation)