20-27 July 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

Searches for first and second generation leptoquarks using the ATLAS detector

Not scheduled
Dauphine (Alpes Congrès - Alpexpo)


Alpes Congrès - Alpexpo



Carolina Deluca (Stony Brook University)


Searches for the pair production of first and second generation  scalar leptoquarks have been performed using 35 pb−1 of proton-proton collision data recorded by the ATLAS  detector at sqrt(s) = 7 TeV, delivered by the LHC during 2010. We search for  leptoquarks in events with two oppositely charged muons or electrons and at least two jets, and in  events with one muon or electron, missing transverse momentum and at least two jets. The results on  the dilepton and the single lepton channels are combined in each generation, and presented as limits on the leptoquark mass as a function of the branching fraction of a leptoquark to a charged lepton. The modeling  of the Standard Model backgrounds is validated in dedicated control regions that enhance the major  background contributions and that are orthogonal to the signal region. The signal region is defined using  an a priori optimization procedure based on simulated signal and background yields. After full event  selection, the observed number of events are consistent with the expected yields. Leptoquark production is  excluded at the 95% CL for masses MLQ < 376 (319) GeV and MLQ < 422 (362) GeV for first and second  generation scalar leptoquarks, respectively, when assuming the branching fraction of a leptoquark  to a charged lepton is equal to 1.0 (0.5).

Primary author

Carolina Deluca (Stony Brook University)

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