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Measurement of the $Z$ boson cross-section in the dimuon channel in $pp$ collisions at $\sqrt{s}$ = 7 TeV

We measure the production cross-section of the Z boson in the dimuon decay channel in pp collisions at √ s = 7 TeV. The measurement is based on data collected by the ATLAS experiment at the CERN Large Hadron Collider between April and July 2010. The amount of data collected was 331 nb−1 , containing...

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Detalles Bibliográficos
Autor principal: Kashif, Lashkar Mohammad
Lenguaje:eng
Publicado: 2013
Materias:
Acceso en línea:http://cds.cern.ch/record/1578574
Descripción
Sumario:We measure the production cross-section of the Z boson in the dimuon decay channel in pp collisions at √ s = 7 TeV. The measurement is based on data collected by the ATLAS experiment at the CERN Large Hadron Collider between April and July 2010. The amount of data collected was 331 nb−1 , containing 109 Z boson candidates decaying to muons. The background level for our measurement is very small, which we estimate using Monte Carlo simulation. We use data-driven techniques to extract experimental efficiencies as well as the muon momentum scale and resolution. We measure σ Z/γ ∗ × BR(Z/γ ∗ → µ +µ −) = 0.87 ± 0.08 (stat) ± 0.05 (sys) ± 0.10 (lum) nb, which is in agreement with the Standard Model expectation at next-to-next-to-leading-order accuracy in QCD.