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

G. Aad; S. Albrand; S. Berlendis; C. Camincher; J. Collot; S. Crépé-Renaudin; P.A. Delsart; C. Gabaldon; M.H. Genest; J.Y. Hostachy; F. Ledroit-Guillon; A. Lleres; A. Lucotte; F. Malek; E. Petit; J. Stark; B. Trocmé; M. Wu; G. Rahal; D. Boumediene; E. Busato; D. Calvet; S. Calvet; A.R. Chomont; J. Donini; Ph. Gris; H. Liao; R. Madar; D. Pallin; S.M. Romano Saez; C. Santoni; D. Simon; F. Vazeille; M.K. Ayoub; A. Bassalat; C. Bécot; S. Binet; C. Bourdarios; D. Delgove; J-B. de Vivie De Regie; L. Duflot; M. Escalier; L. Fayard; D. Fournier; E.L. Gkougkousis; J-F. Grivaz; T. Guillemin; F. Hariri; S. Henrot-Versille; J. Hrivnac; L. Iconomidou-Fayard; M. Kado; A. Lounis; N. Makovec; N. Morange; C. Nellist; P. Petroff; L. Poggioli; P. Puzo; A. Renaud; D. Rousseau; G. Rybkin; A.C. Schaffer; E. Scifo; L. Serin; S. Simion; R. Tanaka; D. Zerwas; Zhongkai Zhang; Y. Zhao; Z. Barnovska; N. Berger; M. Delmastro; L. Di Ciaccio; S. Elles; Grevtsov K.; T. Hryn’ova; S. Jézéquel; I. Koletsou; R. Lafaye; J. Leveque; N. Massol; P. Mastrandrea; G. Sauvage; E. Sauvan; O. Simard; T. Todorov; I. Wingerter-Seez; E. Yatsenko; L. Alio; M. Barbero; A. Calandri; T.P. Calvet; Y. Coadou; C. Diaconu; S. Diglio; F. Djama; V. Ellajosyula; L. Feligioni; J. Gao; A. Hadef; G.D. Hallewell; F. Hubaut; S.J. Kahn; E. B. F. G. Knoops; E. Le Guirriec; J. Liu; K. Liu; D. Madaffari; K. Mochizuki; E. Monnier; S. Muanza; E. Nagy; P. Pralavorio; Y. Rodina; A. Rozanov; M. Talby; T. Theveneaux-Pelzer; R.E. Ticse Torres; S. Tisserant; J. Toth; F. Touchard; L. Vacavant; Chen Wang

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

G. Aad ¹ S. Albrand ² S. Berlendis ² C. Camincher ² J. Collot ² S. Crépé-Renaudin ² P.A. Delsart ² C. Gabaldon ² M.H. Genest ² J.Y. Hostachy ² F. Ledroit-Guillon ² A. Lleres ² A. Lucotte ² F. Malek ² E. Petit ² J. Stark ² B. Trocmé ² M. Wu ² G. Rahal ³ D. Boumediene ⁴ E. Busato ⁴ D. Calvet ⁴ S. Calvet ⁴ A.R. Chomont ⁴ J. Donini ⁴ Ph. Gris ⁴ H. Liao ⁴ R. Madar ⁴ D. Pallin ⁴ S.M. Romano Saez ⁴ C. Santoni ⁴ D. Simon ⁴ F. Vazeille ⁴ M.K. Ayoub ⁵ A. Bassalat ⁵ C. Bécot ⁵ S. Binet ⁵ C. Bourdarios ⁵ D. Delgove ⁵ J-B. de Vivie De Regie ⁵ L. Duflot ⁵ M. Escalier ⁵ L. Fayard ⁵ D. Fournier ⁵ E.L. Gkougkousis ⁵ J-F. Grivaz ⁵ T. Guillemin ⁵ F. Hariri ⁵ S. Henrot-Versille ⁵ J. Hrivnac ⁵ L. Iconomidou-Fayard ⁵ M. Kado ⁵ A. Lounis ⁵ N. Makovec ⁵ N. Morange ⁵ C. Nellist ⁵ P. Petroff ⁵ L. Poggioli ⁵ P. Puzo ⁵ A. Renaud ⁵ D. Rousseau ⁵ G. Rybkin ⁵ A.C. Schaffer ⁵ E. Scifo ⁵ L. Serin ⁵ S. Simion ⁵ R. Tanaka ⁵ D. Zerwas ⁵ Zhongkai Zhang ⁵ Y. Zhao ⁵ Z. Barnovska ⁶ N. Berger ⁶ M. Delmastro ⁶ L. Di Ciaccio ⁶ S. Elles ⁶ Grevtsov K. ⁶ T. Hryn’ova ⁶ S. Jézéquel ⁶ I. Koletsou ⁶ R. Lafaye ⁶ J. Leveque ⁶ N. Massol ⁶ P. Mastrandrea ⁶ G. Sauvage ⁶ E. Sauvan ⁶ O. Simard ⁶ T. Todorov ⁶ I. Wingerter-Seez ⁶ E. Yatsenko ⁶ L. Alio ¹ M. Barbero ¹ A. Calandri ¹ T.P. Calvet ¹ Y. Coadou ¹ C. Diaconu ¹ S. Diglio ¹ F. Djama ¹ V. Ellajosyula ¹ L. Feligioni ¹ J. Gao ¹ A. Hadef ¹ G.D. Hallewell ¹ F. Hubaut ¹ S.J. Kahn ¹ E. B. F. G. Knoops ¹ E. Le Guirriec ¹ J. Liu ¹ K. Liu ¹ D. Madaffari ¹ K. Mochizuki ¹ E. Monnier ¹ S. Muanza ¹ E. Nagy ¹ P. Pralavorio ¹ Y. Rodina ¹ A. Rozanov ¹ M. Talby ¹ T. Theveneaux-Pelzer ¹ R.E. Ticse Torres ¹ S. Tisserant ¹ J. Toth ¹ F. Touchard ¹ L. Vacavant ¹ Chen Wang ¹

1 CPPM - Centre de Physique des Particules de Marseille

2 LPSC - Laboratoire de Physique Subatomique et de Cosmologie

3 CC-IN2P3 - Centre de Calcul de l'IN2P3

4 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand

5 LAL - Laboratoire de l'Accélérateur Linéaire

6 LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules - Laboratoire d'Annecy de Physique des Particules

Abstract : 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. The Sherpa event generator shows larger deviations from the measured observables than Pythia8 and Herwig7. Typically, all three Monte Carlo generators provide predictions that are in better agreement with the data at high $Z$-boson transverse momenta than at low $Z$-boson transverse momenta and for the observables that are less sensitive to the number of charged particles in the event.

Document type :

Journal articles

Domain :

Physics [physics] / High Energy Physics - Experiment [hep-ex]

Complete list of metadatas

http://hal.in2p3.fr/in2p3-01280703
Contributor : Emmanuelle Vernay <>
Submitted on : Tuesday, March 1, 2016 - 7:58:47 AM
Last modification on : Tuesday, November 5, 2019 - 4:32:43 PM

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

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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

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