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Measurement of tau polarization in W->taunu decays with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV

G. Aad S. Albrand 1 M.L. Andrieux 1 Q. Buat 1 B. Clement 1 J. Collot 1 S. Crépé-Renaudin 1 B. Dechenaux 1 T. Delemontex 1 P.A. Delsart 1 J. Donini 1 D. Dzahini 1 M.H. Genest 1 J.Y. Hostachy 1 E. Laisne 1 F. Ledroit-Guillon 1 A. Lleres 1 A. Lucotte 1 F. Malek 1 P. Martin 1 F. Polci 1 J. Stark 1 X. Sun 1 B. Trocmé 1 J. Wang 1 C. Weydert 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 Zhiqing Zhang 3 L. Aperio Bella 4 B. Aubert 4 N. Berger 4 J. Colas 4 M. Delmastro 4 L. Di Ciaccio 4 T.K.O. Doan 4 S. Elles 4 C. Goy 4 L. Helary 4 T. Hryn'Ova 4 A. Jérémie 4 S. Jézéquel 4 M. Kataoka 4 J. Labbe 4 R. Lafaye 4 J. Leveque 4 V.P. Lombardo 4 N. Massol 4 P. Perrodo 4 E. Petit 4 H. Przysiezniak 4 E. Richter-Was 4 G. Sauvage 4 E. Sauvan 4 M. Schwoerer 4 T. Todorov 4 D. Tsionou 4 I. Wingerter-Seez 4 R. Zitoun 4 Y. Zolnierowski 4 D. Boumediene 5 Emmanuel Busato 5 D. Calvet 5 S. Calvet 5 Reina Coromoto Camacho Toro 5 Diane Cinca 6 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 L. P. Says 5 F. Vazeille 5 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 F. Henry-Couannier 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 Z. Qian 7 A. Rozanov 7 M. Talby 7 N. Tannoury 7 S. Tisserant 7 J. Toth 7 F. Touchard 7 L. Vacavant 7
Abstract : In this paper, a measurement of tau polarization in W->taunu decays is presented. It is measured from the energies of the decay products in hadronic tau decays with a single final state charged particle. The data, corresponding to an integrated luminosity of 24 pb^-1, were collected by the ATLAS experiment at the Large Hadron Collider in 2010. The measured value of the tau polarization is Ptau = -1.06 +/- 0.04 (stat) + 0.05 (syst) - 0.07 (syst), in agreement with the Standard Model prediction, and is consistent with a physically allowed 95% CL interval [-1,-0.91]. Measurements of tau polarization have not previously been made at hadron colliders.
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Submitted on : Wednesday, May 2, 2012 - 10:57:19 AM
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G. Aad, S. Albrand, M.L. Andrieux, Q. Buat, B. Clement, et al.. Measurement of tau polarization in W->taunu decays 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.2062. ⟨10.1140/epjc/s10052-012-2062-6⟩. ⟨in2p3-00693205⟩

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