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. 2011 Jun 24;106(25):251801.
doi: 10.1103/PhysRevLett.106.251801. Epub 2011 Jun 22.

Search for a heavy particle decaying into an electron and a muon with the ATLAS detector in sqrt[s] = 7 TeV pp collisions at the LHC

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YoshidaC YoungS YoussefD YuJ YuJ YuL YuanA YurkewiczV G ZaetsR ZaidanA M ZaitsevZ ZajacovaYo K ZaliteL ZanelloP ZarzhitskyA ZaytsevC ZeitnitzM ZellerP F ZemaA ZemlaC ZendlerA V ZeninO ZeninT ZenišZ ZenonosS ZenzD ZerwasG Zevi Della PortaZ ZhanD ZhangH ZhangJ ZhangX ZhangZ ZhangL ZhaoT ZhaoZ ZhaoA ZhemchugovS ZhengJ ZhongB ZhouN ZhouY ZhouC G ZhuH ZhuJ ZhuY ZhuX ZhuangV ZhuravlovD ZieminskaR ZimmermannS ZimmermannS ZimmermannM ZiolkowskiR ZitounL ZivkovićV V ZmouchkoG ZobernigA ZoccoliY ZolnierowskiA ZseneiM Zur NeddenV ZutshiL ZwalinskiATLAS Collaboration
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Search for a heavy particle decaying into an electron and a muon with the ATLAS detector in sqrt[s] = 7 TeV pp collisions at the LHC

G Aad et al. Phys Rev Lett. .
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Abstract

This Letter presents the first search for a heavy particle decaying into an e ± μ(-/+) final state in sqrt[s] = 7 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 pb(-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 λ(311)' = 0.11 and λ312 = 0.07. In a lepton flavor violating model, a Z'-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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