Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at sqrt(s) = 7 TeV with the ATLAS experiment - IN2P3 - Institut national de physique nucléaire et de physique des particules
Article Dans Une Revue European Physical Journal C: Particles and Fields Année : 2012

Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at sqrt(s) = 7 TeV with the ATLAS experiment

G. Aad , L. Aperio Bella (1) , B. Aubert (1) , N. Berger (1) , J. Colas (1) , M. Delmastro (1) , L. Di Ciaccio (1) , T.K.O. Doan (1) , S. Elles (1) , C. Goy (1) , L. Helary (1) , T. Hryn'Ova (1) , 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) , Y. Zolnierowski (1) , C. Biscarat (2) , E. Cogneras (2) , G. Rahal (2) , S. Abdel Khalek (3) , H. Abreu (3) , N. Andari (3) , C. Arnault (3) , E. Augé (3) , P. Barrillon (3) , M. Benoit (3) , S. Binet (3) , C. Bourdarios (3) , C. de La Taille (3) , J.B. de Vivie de Regie (3) , L. Duflot (3) , M. Escalier (3) , L. Fayard (3) , D. Fournier (3) , J.-F. Grivaz (3) , S. Henrot-Versillé (3) , J. Hrivnac (3) , L. Iconomidou-Fayard (3) , J. Idarraga (3) , M. Kado (3) , N. Lorenzo Martinez (3) , A. Lounis (3) , N. Makovec (3) , P. Matricon (3) , F. Niedercorn (3) , L. Poggioli (3) , P. Puzo (3) , A. Renaud (3) , D. Rousseau (3) , G. Rybkin (3) , J.B. Sauvan (3) , J. Schaarschmidt (3) , A.C. Schaffer (3) , E. Scifo (3) , L. Serin (3) , S. Simion (3) , R. Tanaka (3) , M. Teinturier (3) , J.J. Veillet (3) , I. Vukotic (3) , F. Wicek (3) , D. Zerwas (3) , Z. Zhang (3) , D. Boumediene (4) , Emmanuel Busato (4) , D. Calvet (4) , S. Calvet (4) , Reina Coromoto Camacho Toro (4) , Diane Cinca (4) , J. Donini (4) , R. Febbraro (4) , N. Ghodbane (4) , C. Guicheney (4) , H. Liao (4) , D. Pallin (4) , Daniela Paredes Hernández (4) , F. Podlyski (4) , C. Santoni (4) , L. P. Says (4) , F. Vazeille (4) , S. Albrand (5) , M.L. Andrieux (5) , Q. Buat (5) , B. Clement (5) , J. Collot (5) , S. Crépé-Renaudin (5) , B. Dechenaux (5) , T. Delemontex (5) , P.A. Delsart (5) , M.H. Genest (5) , J.Y. Hostachy (5) , E. Laisne (5) , F. Ledroit-Guillon (5) , A. Lleres (5) , A. Lucotte (5) , F. Malek (5) , P. Martin (5) , F. Polci (5) , J. Stark (5) , X. Sun (5) , B. Trocmé (5) , J. Wang (5) , C. Weydert (5) , S. Aoun (6) , C. P. Bee (6) , C. Bertella (6) , N. Bousson (6) , J. C. Clémens (6) , Y. Coadou (6) , F. Djama (6) , F. Etienne (6) , L. Feligioni (6) , F. Henry-Couannier (6) , D. Hoffmann (6) , F. Hubaut (6) , E. B. F. G. Knoops (6) , E. Le Guirriec (6) , B. Li (6) , J. Maurer (6) , E. Monnier (6) , J. Odier (6) , P. Pralavorio (6) , Z. Qian (6) , A. Rozanov (6) , M. Talby (6) , N. Tannoury (6) , S. Tisserant (6) , J. Toth (6) , F. Touchard (6) , L. Vacavant (6)
G. Aad
N. Berger
C. Goy
T. Hryn'Ova
E. Cogneras
E. Augé
D. Rousseau
D. Zerwas
  • Fonction : Auteur
  • PersonId : 842996
Z. Zhang
Y. Coadou
E. Monnier
J. Odier
  • Fonction : Auteur
  • PersonId : 1433897

Résumé

This paper describes an analysis of the angular distribution of W->enu and W->munu decays, using data from pp collisions at sqrt(s) = 7 TeV recorded with the ATLAS detector at the LHC in 2010, corresponding to an integrated luminosity of about 35 pb^-1. Using the decay lepton transverse momentum and the missing transverse energy, the W decay angular distribution projected onto the transverse plane is obtained and analysed in terms of helicity fractions f0, fL and fR over two ranges of W transverse momentum (ptw): 35 < ptw < 50 GeV and ptw > 50 GeV. Good agreement is found with theoretical predictions. For ptw > 50 GeV, the values of f0 and fL-fR, averaged over charge and lepton flavour, are measured to be : f0 = 0.127 +/- 0.030 +/- 0.108 and fL-fR = 0.252 +/- 0.017 +/- 0.030, where the first uncertainties are statistical, and the second include all systematic effects.

Dates et versions

in2p3-00679734 , version 1 (16-03-2012)

Identifiants

Citer

G. Aad, L. Aperio Bella, B. Aubert, N. Berger, J. Colas, et al.. Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at sqrt(s) = 7 TeV with the ATLAS experiment. European Physical Journal C: Particles and Fields, 2012, 72, pp.2001. ⟨10.1140/epjc/s10052-012-2001-6⟩. ⟨in2p3-00679734⟩
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