Measurement of event shapes at large momentum transfer with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV

G. Aad , L. Aperio Bella (1) , B. Aubert (1) , N. Berger (1) , J. Colas , M. Delmastro (1) , L. Di Ciaccio (1) , T.K.O. Doan (1) , S. Elles (1) , C. Goy (1) , T. Hryn'Ova , A. Jérémie (1) , S. Jézéquel (1) , M. Kataoka (1) , J. Labbe (1) , R. Lafaye (1) , J. Leveque (1) , V.P. Lombardo (1) , N. Massol (1) , P. Perrodo (1) , E. Petit (1) , H. Przysiezniak (1) , G. Sauvage (1) , E. Sauvan (1) , M. Schwoerer (1) , T. Todorov (1) , D. Tsionou (1) , I. Wingerter-Seez (1) , R. Zitoun (1) , C. Biscarat (2) , E. Cogneras (2) , G. Rahal (2) , S. Albrand (3) , Q. Buat (3) , B. Clement (3) , J. Collot (3) , S. Crépé-Renaudin (3) , B. Dechenaux (3) , T. Delemontex (3) , P.A. Delsart (3) , M.H. Genest (3) , J.Y. Hostachy (3) , E. Laisne (3) , F. Ledroit-Guillon (3) , A. Lleres (3) , A. Lucotte (3) , F. Malek (3) , J. Stark (3) , X. Sun (3) , B. Trocmé (3) , J. Wang (3) , C. Weydert (3) , F. Vannucci (4) , D. Boumediene (5) , Emmanuel Busato (5) , D. Calvet (5) , S. Calvet (5) , Reina Coromoto Camacho Toro (5) , Diane Cinca (5) , J. Donini (5) , R. Febbraro (5) , N. Ghodbane (5) , C. Guicheney (5) , H. Liao (5) , D. Pallin (5) , Daniela Paredes Hernández (5) , F. Podlyski (5) , C. Santoni (5) , F. Vazeille (5) , S. Abdel Khalek (6) , H. Abreu (6) , N. Andari (6) , C. Arnault (6) , E. Augé (6) , P. Barrillon (6) , M. Benoit (6) , S. Binet (6) , C. Bourdarios (6) , C. de La Taille (6) , J.B. de Vivie de Regie (6) , L. Duflot (6) , M. Escalier (6) , L. Fayard (6) , D. Fournier (6) , J.-F. Grivaz (6) , S. Henrot-Versillé (6) , J. Hrivnac (6) , L. Iconomidou-Fayard (6) , J. Idarraga (6) , M. Kado (6) , N. Lorenzo Martinez (6) , A. Lounis (6) , N. Makovec (6) , P. Matricon (6) , F. Niedercorn (6) , L. Poggioli (6) , P. Puzo (6) , A. Renaud (6) , D. Rousseau (6) , G. Rybkin (6) , J.B. Sauvan (6) , J. Schaarschmidt (6) , A.C. Schaffer (6) , E. Scifo (6) , L. Serin (6) , S. Simion (6) , R. Tanaka (6) , M. Teinturier (6) , J.J. Veillet (6) , I. Vukotic (6) , F. Wicek (6) , D. Zerwas (6) , Zhiqing Zhang (6) , S. Aoun (7) , C. P. Bee (7) , C. Bertella (7) , N. Bousson (7) , J. C. Clémens (7) , Y. Coadou (7) , F. Djama (7) , F. Etienne (7) , L. Feligioni (7) , D. Hoffmann (7) , F. Hubaut (7) , E. B. F. G. Knoops (7) , E. Le Guirriec (7) , B. Li (7) , J. Maurer (7) , E. Monnier (7) , J. Odier (7) , P. Pralavorio (7) , A. Rozanov (7) , M. Talby (7) , N. Tannoury (7) , S. Tisserant (7) , J. Toth (7) , F. Touchard (7) , L. Vacavant (7)

1 LAPP - Laboratoire d'Annecy de Physique des Particules
2 CC-IN2P3 - Centre de Calcul de l'IN2P3
3 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
4 APC - Neutrinos
5 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
6 LAL - Laboratoire de l'Accélérateur Linéaire
7 CPPM - Centre de Physique des Particules de Marseille

A measurement of event shape variables is presented for large momentum transfer proton-proton collisions using the ATLAS detector at the Large Hadron Collider. Six event shape variables calculated using hadronic jets are studied in inclusive multi-jet events in 35 pb^-1 of integrated luminosity at a center-of-mass energy of sqrt(s) = 7 TeV. These measurements are compared to predictions by three Monte Carlo event generators containing leading-logarithmic parton showers matched to leading order matrix elements for 2 to 2 and 2 to n (n=2,...6) scattering. Measurements of the third-jet resolution parameter, aplanarity, thrust, sphericity, and transverse sphericity are generally well described. The mean value of each event shape variable is evaluated as a function of the average momentum of the two leading jets pT1 and pT2, with a mean pT approaching 1 TeV.

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

G. Aad, L. Aperio Bella, B. Aubert, N. Berger, J. Colas, et al.. Measurement of event shapes at large momentum transfer with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV. European Physical Journal C: Particles and Fields, 2012, 72, pp.2211. ⟨10.1140/epjc/s10052-012-2211-y⟩. ⟨in2p3-00707506⟩