Search for a heavy neutral particle decaying into an electron and a muon using 1 fb^-1 of ATLAS data

The ATLAS collaboration
Eur.Phys.J.C 71 (2011) 1809, 2011.

Abstract (data abstract)
CERN-LHC. A search for high mass neutral particles that decay directly into oppositely charged electron-muon pairs produced in proton-proton collisions at a centre-of-mass energy of 7 TeV. The analysis uses a data sample of total integrated luminosity of 1.07 fb-1 and the results are found to be consistent with the Standard Model expectations. The high di-lepton mass region is used to set upper limits on the production of two possible new physics processes: tau sneutrinos in an R-parity violating SUSY model and Zprime like vector bosons in a lepton flavour violating model. In the tables the errors on the data points are purely statistical and can therefore be derived from the total number of events observed in each bin. The auxillary plots refered to in several of the tables are available on the ATLAS web site:

  • Table 1

    Data from F 1


    Observed and predicted E-MU invariant mass distributions.

  • Table 2

    Data from F 1 (C=AUXILIARY PLOTS)


    Observed and predicted electron PT distributions.

  • Table 3

    Data from F 2 (C=AUXILIARY PLOTS)


    Observed and predicted muon PT distributions.

  • Table 4

    Data from F 3 (C=AUXILIARY PLOTS)


    Observed and predicted missing ET distributions.

  • Table 5

    Data from F 2A


    Observed 95% CL upper limits on the sneutrino cross section times its e-mu branching ratio.

  • Table 6

    Data from F 3


    Observed 95% CL upper limits on the zprime cross section times its e-mu branching ratio.

  • Table 7

    Data from F 2B


    95% CL upper limits on lambdaprime_311 coupling as a function of the sneutrino mass for three values of lamdba_312.

  • Table 8

    Data from F 4 (C=AUXILIARY PLOTS)


    RPV sneutrino signal selection efficiency as a function of the sneutrino mass.

  • Table 9

    Data from F 5 (C=AUXILIARY PLOTS)


    The Zprime signal selection efficiency as a function of the Zprime mass.

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