Abstract
Measurements of differential cross-sections of W boson production in association with jets, and jets containing b hadrons are presented. The measurements are based on 35 pb − 1 of pp collisions at \(\sqrt{s}=7\) TeV collected with the ATLAS detector at the LHC, using the electron and muon decay channels of the W boson. The data are found to be compatible with next-to-leading order predictions. In addition, a study of the invariant mass distribution of jet pairs produced in association with a W boson is presented, based on an integrated luminosity of 1.02 \({\mbox{fb$^{-1}$}}\). The measured dijet mass shows no significant excess over the Standard Model expectation.
Highlights
%L dt = 1.02 fb-1 data 2011 ( s = 7 TeV) W # μ" (Alpgen)
One isolated lepton: pT > 20 GeV Missing transverse energy: ETmiss > 25 GeV Transverse mass of the (l, ETmiss) system: mT > 40 GeV Events with a second lepton of the same flavor are rejected mT [GeV]
Missing Transverse Energy (ETmiss): based on the sum of calorimeter cell energy deposits in topological clusters calibrated at the electromagne>c scale, corrected for hadron response and muon energy
Summary
%L dt = 1.02 fb-1 data 2011 ( s = 7 TeV) W # μ" (Alpgen) Missing transverse energy: ETmiss > 25 GeV Transverse mass of the (l, ETmiss) system: mT > 40 GeV Electron: iden>fica>on based on calorimeter clusters and tracks in the Inner Detector (ID) in |η| < 2.5 Missing Transverse Energy (ETmiss): based on the sum of calorimeter cell energy deposits in topological clusters calibrated at the electromagne>c scale, corrected for hadron response and muon energy
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