Search for a Heavy Particle Decaying into an Electron and a Muon with the ATLAS Detector in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>7</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mi>p</mml:mi></mml:math>collisions at the LHC

This Letter presents the first search for a heavy particle decaying into an ${e}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\mu}}^{\ensuremath{\mp}}$ final state in $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$ $pp$ collisions at the LHC. The data were recorded by the ATLAS detector during 2010 and correspond to a total integrated luminosity of $35\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$. No excess above the standard model background expectation is observed. Exclusions at 95% confidence level are placed on two representative models. In an $R$-parity violating supersymmetric model, tau sneutrinos with a mass below 0.75 TeV are excluded, assuming all $R$-parity violating couplings are zero except ${\ensuremath{\lambda}}_{311}^{\ensuremath{'}}=0.11$ and ${\ensuremath{\lambda}}_{312}=0.07$. In a lepton flavor violating model, a ${Z}^{\ensuremath{'}}$-like vector boson with masses of 0.70--1.00 TeV and corresponding cross sections times branching ratios of 0.175--0.183 pb is excluded. These results extend to higher mass $R$-parity violating sneutrinos and lepton flavor violating $Z$'s than previous constraints from the Tevatron.

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