Measurement of distributions sensitive to the underlying event in inclusive Z-boson production in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector

G. Aad (1) , L. Alio (1) , M. Barbero (1) , C. Bertella (1) , J.C. Clémens (1) , Y. Coadou (1) , Sara Diglio (1) , F. Djama (1) , L. Feligioni (1) , D. Hoffmann (1) , F. Hubaut (1) , E. B. F. G. Knoops (1) , E. Le Guirriec (1) , B. Li (1) , D. Madaffari (1) , K. Mochizuki (1) , E. Monnier (1) , S. Muanza (1) , Y. Nagai (1) , P. Pralavorio (1) , A. Rozanov (1) , T. Serre (1) , M. Talby (1) , E. Tiouchichine (1) , S. Tisserant (1) , J. Toth (1) , F. Touchard (1) , M. Ughetto (1) , L. Vacavant (1) , T. Beau (2) , M. Bomben (2) , G. Calderini (2) , F. Crescioli (2) , O. Davignon (2) , S. de Cecco (2) , A. Demilly (2) , F. Derue (2) , P. Francavilla (2) , M.W. Krasny (2) , D. Lacour (2) , B. Laforge (2) , S. Laplace (2) , O. Le Dortz (2) , G. Lefebvre (2) , B. Malaescu (2) , G. Marchiori (2) , I. Nikolic-Audit (2) , J. Ocariz (2) , S. Pires (2) , M. Ridel (2) , L. Roos (2) , S. Trincaz-Duvoid (2) , F. Vannucci (2) , D. Varouchas (2) , D. Boumediene (3) , Emmanuel Busato (3) , D. Calvet (3) , S. Calvet (3) , J. Donini (3) , E. Dubreuil (3) , N. Ghodbane (3) , G. Gilles (3) , Ph. Gris (3) , C. Guicheney (3) , H. Liao (3) , D. Pallin (3) , Daniela Paredes Hernández (3) , F. Podlyski (3) , C. Santoni (3) , Timothée Theveneaux-Pelzer (3) , Loïc Valery (3) , F. Vazeille (3) , G. Rahal (4) , H. Bachaou (5) , F. Balli (5) , F. Bauer (5) , N. Besson (5) , J.-B. Blanchard (5) , M. Boonekamp (5) , A. Calandri (5) , L. Chevalier (5) , M. Dano Hoffmann (5) , F. Deliot (5) , J. Ernwein (5) , A.I. Etienvre (5) , A. Formica (5) , P.F. Giraud (5) , J. Goncalves Pinto Firmino da Costa (5) , H.M.X. Grabas (5) , C. Guyot (5) , R. Hanna (5) , S. Hassani (5) , W. Kozanecki (5) , E. Lancon (5) , J.F. Laporte (5) , C. Maiani (5) , P. Mal (5) , B. Mansoulie (5) , H. Martinez (5) , N. Meric (5) , J.-P. Meyer (5) , R. Nicolaidou (5) , A. Ouraou (5) , E. Protopapadaki (5) , C.R. Royon (5) , L.L. Schoffel (5) , Ph. Schune (5) , Ph. Schwemling (5) , J. Schwindling (5) , D. Tsionou (5) , N. Vranjes (5) , M. Xiao (5) , S. Abdel Khalek (6) , A. Bassalat (6) , C. Becot (6) , S. Binet (6) , C. Bourdarios (6) , D. Charfeddine (6) , J.B. de Vivie de Regie (6) , L. Duflot (6) , M. Escalier (6) , L. Fayard (6) , D. Fournier (6) , J.-F. Grivaz (6) , T. Guillemin (6) , F. Hariri (6) , S. Henrot-Versillé (6) , J. Hrivnac (6) , L. Iconomidou-Fayard (6) , M. Kado (6) , A. Lounis (6) , N. Makovec (6) , L. Poggioli (6) , P. Puzo (6) , A. Renaud (6) , D. Rousseau (6) , G. Rybkin (6) , A.C. Schaffer (6) , E. Scifo (6) , L. Serin (6) , S. Simion (6) , R. Tanaka (6) , H.L. Tran (6) , D. Zerwas (6) , Z. Zhang (6) , S. Albrand (7) , J. Brown (7) , J. Collot (7) , S. Crépé-Renaudin (7) , B. Dechenaux (7) , P.A. Delsart (7) , C. Gabaldon (7) , M.H. Genest (7) , J.Y. Hostachy (7) , F. Ledroit-Guillon (7) , A. Lleres (7) , A. Lucotte (7) , F. Malek (7) , C. Monini (7) , J. Stark (7) , B. Trocmé (7) , M. Wu (7) , Z. Barnovska (8) , N. Berger (8) , M. Delmastro (8) , L. Di Ciaccio (8) , T.K.O. Doan (8) , S. Elles (8) , C. Goy (8) , T. Hryn'Ova (8) , S. Jézéquel (8) , H. Keoshkerian (8) , I. Koletsou (8) , R. Lafaye (8) , J. Leveque (8) , V.P. Lombardo (8) , N. Massol (8) , H. Przysiezniak (8) , G. Sauvage (8) , E. Sauvan (8) , M. Schwoerer (8) , O. Simard (8) , T. Todorov (8) , I. Wingerter-Seez (8)

1 CPPM - Centre de Physique des Particules de Marseille
2 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
3 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
4 CC-IN2P3 - Centre de Calcul de l'IN2P3
5 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
6 LAL - Laboratoire de l'Accélérateur Linéaire
7 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
8 LAPP - Laboratoire d'Annecy de Physique des Particules

A measurement of charged-particle distributions sensitive to the properties of the underlying event is presented for an inclusive sample of events containing a Z-boson , decaying to an electron or muon pair. The measurement is based on data collected using the ATLAS detector at the LHC in proton-proton collisions at a centre-of-mass energy of 7 TeV with an integrated luminosity of $4.6$ fb$^{-1}$. Distributions of the charged particle multiplicity and of the charged particle transverse momentum are measured in regions of azimuthal angle defined with respect to the Z-boson direction. The measured distributions are compared to similar distributions measured in jet events, and to the predictions of various Monte Carlo generators implementing different underlying event models.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]

G. Aad, L. Alio, M. Barbero, C. Bertella, J.C. Clémens, et al.. Measurement of distributions sensitive to the underlying event in inclusive Z-boson production in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector. European Physical Journal C: Particles and Fields, 2014, 74 (12), pp.3195. ⟨10.1140/epjc/s10052-014-3195-6⟩. ⟨in2p3-01063380⟩