1112.4462 (ATLAS Collaboration)

Search for contact interactions in dilepton events from pp collisions at
sqrt(s) = 7 TeV with the ATLAS detector    [PDF]

ATLAS Collaboration

This Letter presents a search for contact interactions in the dielectron and
dimuon channels using data from proton-proton collisions produced by the LHC at
sqrt(s) = 7 TeV and recorded by the ATLAS detector. The data sample, collected
in 2011, corresponds to an integrated luminosity of 1.08 and 1.21 fb^-1 in the
e+ e- and mu+ mu- channels, respectively. No significant deviations from the
standard model are observed. Using a Bayesian approach with a prior flat in
1/Lambda^2, the following 95% CL lower limits are placed on the energy scale of
llqq contact interactions: Lambda^- > 10.1 TeV (Lambda^+ > 9.4 TeV) in the
electron channel and Lambda^- > 8.0 TeV (Lambda^+ > 7.0 TeV) in the muon
channel for constructive (destructive) interference in the left-left isoscalar
contact interaction model. Limits are also provided for a prior flat in
1/Lambda^4.

View original: http://arxiv.org/abs/1112.4462