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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 6 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 7 H. Abreu 7 N. Andari 7 C. Arnault 7 E. Augé 7 P. Barrillon 7 M. Benoit 7 S. Binet 7 C. Bourdarios 7 C. de la Taille 7 J.B. de Vivie de Regie 7 L. Duflot 7 M. Escalier 7 L. Fayard 7 D. Fournier 7 J.-F. Grivaz 7 S. Henrot-Versillé 7 J. Hrivnac 7 L. Iconomidou-Fayard 7 J. Idarraga 7 M. Kado 7 N. Lorenzo Martinez 7 A. Lounis 7 N. Makovec 7 P. Matricon 7 F. Niedercorn 7 L. Poggioli 7 P. Puzo 7 A. Renaud 7 D. Rousseau 7 G. Rybkin 7 J.B. Sauvan 7 J. Schaarschmidt 7 A.C. Schaffer 7 E. Scifo 7 L. Serin 7 S. Simion 7 R. Tanaka 7 M. Teinturier 7 J.J. Veillet 7 I. Vukotic 7 F. Wicek 7 D. Zerwas 7 Zhiqing Zhang 7 S. Aoun 8 C. P. Bee 8 C. Bertella 8 N. Bousson 8 J. C. Clémens 8 Y. Coadou 8 F. Djama 8 F. Etienne 8 L. Feligioni 8 D. Hoffmann 8 F. Hubaut 8 E. B. F. G. Knoops 8 E. Le Guirriec 8 B. Li 8 J. Maurer 8 E. Monnier 8 J. Odier 8 P. Pralavorio 8 A. Rozanov 8 M. Talby 8 N. Tannoury 8 S. Tisserant 8 J. Toth 8 F. Touchard 8 L. Vacavant 8
Abstract : 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.
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Submitted on : Tuesday, June 12, 2012 - 5:33:43 PM
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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, Springer Verlag (Germany), 2012, 72, pp.2211. ⟨10.1140/epjc/s10052-012-2211-y⟩. ⟨in2p3-00707506⟩

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