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

This Letter presents the first search for a heavy particle decaying into an e±μ final state in √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.
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [12] ;  [13] ;  [14] ;  [15] ;  [16] ;  [17] ;  [18] ;  [19] ;  [20]
  1. Albert-Ludwigs-Universitat, Freiburg (Germany). Fakultat fur Mathematik und Physik
  2. Univ. of Oklahoma, Norman, OK (United States). Homer L. Dodge Dept. of Physics and Astronomy
  3. Universitat Autonoma de Barcelona and ICREA, Barcelona (Spain). Institut de Fisica d' Altes Energies
  4. Universite de Geneve, Geneva (Switzerland). Section de Physique
  5. Oxford Univ., Oxford (United Kingdom). Dept. of Physics
  6. Oklahoma State Univ., Stillwater, OK (United States). Dept. of Physics
  7. Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy
  8. Tel Aviv Univ., Tel Aviv (Israel). Raymond and Beverly Sackler School of Physics and Astronomy
  9. Universita di Milano, Milano (Italy). Dipartimento di Fisica; INFN Sezione di Milano, Milano (Italy)
  10. Collegato di Udine (Italy). INFN Gruppo; ICTP, Trieste (Italy)
  11. Brookhaven National Lab. (BNL), Upton, NY (United States). Physics Dept.
  12. Hampton Univ., Hampton, VA (United States); Dept. of Physics
  13. Yale Univ., New Haven, CT (United States). Dept. of Physics
  14. Werner-Heisenberg-Institut, Muchen (Germany). Max-Planck-Institut fur Physik
  15. Ludwig Maximilian Univ., Munich (Germany). Fakultat fur Physik
  16. Queen Mary Univ. of London, London (United Kingdom). Dept. of Physics
  17. Rutherford Appleton Laboratory, Didcot (United Kingdom). Particle Physics Dept.
  18. Brandeis Univ., Waltham, MA (United States). Dept. of Physics
  19. Universidad de Granada, Granada (Spain). Departamento de Fisica Teorica y del Cosmos and CAFPE
  20. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
OSTI Identifier:
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 106; Journal Issue: 25; Journal ID: ISSN 0031-9007
American Physical Society
Sponsoring Org:
Country of Publication:
United States