Search for a Heavy Particle Decaying into an Electron and a Muon with the ATLAS Detector in $\sqrt{s}=7\mathrm{TeV}$ $pp$ collisions at the LHC

Journal Article · Wed Jun 01 00:00:00 EDT 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.106.251801· OSTI ID:1099636

Aad, G ^[1]; Abbott, B. ^[2]; Abdallah, J ^[3]; Abdelalim, A. A. ^[4]; Abdesselam, A. ^[5]; Abdinov, B ^[6]; Abolins, M ^[7]; Abramowicz, H. ^[8]; Abreu, E. ^[9]; Acharya, B. S. ^[10]; Adams, D. L. ^[11]; Addy, T. N. ^[12]; Adelman, J. ^[13]; Aderholz, M. ^[14]; Adomeit, S. ^[15]; Adragna, P. ^[16]; Adye, T. ^[17]; Aefsky, S. ^[18]; Aguilar-Saavedra, J. A. ^[19]; Siegrist, James L. ^[20]

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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)

This Letter presents the first search for a heavy particle decaying into an e^±$$\mu$$^∓ 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 single coupling dominance and the couplings λ$$\mathbb '\atop{311}$$=0.11, λ₃₁₂=0.07. In a lepton flavor violating model, a Z'-like vector boson with masses of 0.70 to 1.00 TeV and corresponding cross sections times branching ratios of 0.175 to 0.183 pb is excluded. These results extend to higher mass RPV sneutrinos and LFV Z's than previous constraints from the Tevatron.

• Research Organization: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: ATLAS Collaboration
• Grant/Contract Number: AC02-76SF00515
• OSTI ID: 1099636
• Alternate ID(s): OSTI ID: 1502962
• Report Number(s): SLAC-PUB-17062; PRLTAO; 251801
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Vol. 106 Journal Issue: 25; ISSN 0031-9007
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS