Search for a Heavy Particle Decaying into an Electron and a Muon with the ATLAS Detector in root s=7 TeV pp collisions at the LHC

作者：Aad G^*; Abbott B; Abdallah J; Abdelalim A A; Abdesselam A; Abdinov O; Abi B; Abolins M; Abramowicz H; Abreu H; Acerbi E; Acharya B S; Adams D L; Addy T N; Adelman J; Aderholz M; Adomeit S; Adragna P; Adye T; Aefsky S; Aguilar Saavedra J A; Aharrouche M; Ahlen S P; Ahles F; Ahmad A; Ahsan M; Aielli G; Akdogan T; Akesson T P A; Akimoto G; Akimov A V; Akiyama A; Alam M S; Alam M A; Albrand S; Aleksa M

来源：Physical Review Letters, 2011, 106(25): 251801.

DOI：10.1103/PhysRevLett.106.251801

This Letter presents the first search for a heavy particle decaying into an e(+/-)mu(-/+) final state in root 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 lambda(311)' = 0.11 and lambda(312) = 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.

• 出版日期2011-6-22
• 单位中国科学技术大学; 中国科学院; McGill; 中山大学; 南京大学; 中国地震局; 山东大学