Measurement of event-shape observables in $Z \to \ell^{+} \ell^{-}$ events in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector at the LHC

The ATLAS collaboration
Aad, Georges , Abbott, Brad , Abdallah, Jalal , Abdinov, Ovsat , Abeloos, Baptiste , Aben, Rosemarie , Abolins, Maris , AbouZeid, Ossama , Abraham, Nicola , Abramowicz, Halina
Eur.Phys.J.C 76 (2016) 375, 2016.

Abstract (data abstract)
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 $ 1.1 {\rm fb}^{-1}$ of proton--proton collisions recorded by the ATLAS detector at the LHC at a centre-of-mass energy $\sqrt{s}=7$ 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 $\mathcal{F}$ -parameter, which are in particular sensitive to properties of the underlying event at small values of the Z-boson transverse momentum.

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