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Title: Measurement of the low-mass Drell-Yan differential cross section at √s = 7 TeV using the ATLAS detector

The differential cross section for the process Z/γ → ℓℓ (ℓ = e,μ) as a function of dilepton invariant mass is measured in pp collisions at √s = 7 TeV at the LHC using the ATLAS detector. The measurement is performed in the e and μ channels for invariant masses between 26 GeV and 66 GeV using an integrated luminosity of 1.6 fb-1 collected in 2011 and these measurements are combined. The analysis is extended to invariant masses as low as 12 GeV in the muon channel using 35 pb-1 of data collected in 2010. The cross sections are determined within fiducial acceptance regions and corrections to extrapolate the measurements to the full kinematic range are provided. Next-to-next-to-leading-order QCD predictions provide a significantly better description of the results than next-to-leading order QCD calculations, unless the latter are matched to a parton shower calculation.
Authors:
 [1]
  1. et al.
Publication Date:
OSTI Identifier:
1166980
Report Number(s):
BNL--107289-2014-JA
Journal ID: ISSN 1126-6708; KA1101021
Grant/Contract Number:
AC02-98CH10886
Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics
Additional Journal Information:
Journal Name: Journal of High Energy Physics; Journal ID: ISSN 1126-6708
Publisher:
Societa Italiana di Physica
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Contributing Orgs:
ATLAS Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS