Measurement of event-shape observables in Z→ ℓ+ℓ-events in pp collisions at √s= 7 TeV with the ATLAS detector at the LHC



    CERN-LHC. Event-shape observables measured using charged particles in inclusive Z-Boson events are presented, using the electron and muon decay modes of the Z-bosons. The measurements are based on an integrated luminosity of 1.1fb−1
    of proton--proton collisions recorded by the ATLAS detector at the LHC at a centre-of-mass energy √s=7 TeV. Charged-particle distributions, excluding the lepton--antilepton pair from the Z-boson decay, are measured in different ranges of transverse momentum of the Z-boson. Distributions include multiplicity, scalar sum of transverse momenta, beam thrust, transverse thrust, spherocity, and F-parameter, which are in particular sensitive to properties of the underlying event at small values of the Z-boson transverse momentum.
    Date made available26 Jul 2016

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