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- W1780852936 abstract "Muon pairs can be produced through the Drell-Yan process over a large invariant mass range at CERN Large Hadron Collider (LHC). In the Standard Model (SM) of particle physics, the process occurs to first order via qqbar annihilation into a real (or virtual) Z boson or a virtual photon (g*). The presence of both vector and axial-vector couplings of the fermions to the Z boson gives rise to a forward-backward asymmetry (Afb) in the distribution of the polar angle q* of the negatively charged lepton relative to the incoming quark direction in the rest frame of the lepton pair. This asymmetry is particularly useful in searching for new interactions at large momentum transfers (Q2 = m2mm) where m2mm is the invariant mass of the muon pair. Indeed, the asymmetry shape would be modified by new resonances (e.g. additional heavier Z' bosons) or new interactions at large mass scales. Moreover, the measurement of Afb can also improve QCD measurements with higher order corrections, constraint Parton Distribution Functions (PDFs) and be used to extract basic SM parameters. This thesis presents the measurement of the mass dependence of the forward-backward asymmetry in pp → Z/g* → m+m- interactions, corresponding to ~ 5.0 fb-1 of integrated luminosity collected by the ATLAS experiment at the LHC at √s = 7 TeV during 2011. The effective weak mixing angle (qeff) from this process, involving predominantly the first generation of quarks, is extracted as sin2qeff and a preliminary result will be presented." @default.
- W1780852936 created "2016-06-24" @default.
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- W1780852936 date "2012-09-18" @default.
- W1780852936 modified "2023-09-27" @default.
- W1780852936 title "Forward-backward asymmetry measurement in $pp to Z/gamma^{*} to mu^{+}mu^{-}$ events at $sqrt{s}=7$ TeV with the ATLAS experiment at the LHC" @default.
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