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Time-dependent angular analysis of the decay Bs -> J/psi phi and extraction of Delta Gamma_s and the CP-violating weak phase phi_s by ATLAS

G. Aad S. Albrand 1 Q. Buat 1 B. Clement 1 J. Collot 1 S. Crépé-Renaudin 1 B. Dechenaux 1 T. Delemontex 1 P.A. Delsart 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 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 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 F. Vannucci 4 S. Aoun 5 C. P. Bee 5 C. Bertella 5 N. Bousson 5 J. C. Clémens 5 Y. Coadou 5 F. Djama 5 F. Etienne 5 L. Feligioni 5 F. Henry-Couannier 5 D. Hoffmann 5 F. Hubaut 5 E. B. F. G. Knoops 5 E. Le Guirriec 5 B. Li 5 J. Maurer 5 E. Monnier 5 J. Odier 5 P. Pralavorio 5 A. Rozanov 5 M. Talby 5 N. Tannoury 5 S. Tisserant 5 J. Toth 5 F. Touchard 5 L. Vacavant 5 L. Aperio Bella 6 B. Aubert 6 N. Berger 6 J. Colas 6 M. Delmastro 6 L. Di Ciaccio 6 T.K.O. Doan 6 S. Elles 6 C. Goy 6 T. Hryn'Ova 6 S. Jézéquel 6 M. Kataoka 6 J. Labbe 6 R. Lafaye 6 J. Leveque 6 V.P. Lombardo 6 N. Massol 6 P. Perrodo 6 E. Petit 6 H. Przysiezniak 6 E. Richter-Was 6 G. Sauvage 6 E. Sauvan 6 M. Schwoerer 6 T. Todorov 6 D. Tsionou 6 I. Wingerter-Seez 6 R. Zitoun 6 D. Boumediene 7 Emmanuel Busato 7 D. Calvet 7 S. Calvet 7 Reina Coromoto Camacho Toro 7 Diane Cinca 8 J. Donini 7 R. Febbraro 7 N. Ghodbane 7 Ph. Gris 7 C. Guicheney 7 H. Liao 7 D. Pallin 7 Daniela Paredes Hernández 7 F. Podlyski 7 C. Santoni 7 F. Vazeille 7
Abstract : A measurement of Bs J/psi phi decay parameters, including the CP-violating weak phase phi_s and the decay width difference Delta Gamma_s is reported, using 4.9 fb-1 of integrated luminosity collected in 2011 by the ATLAS detector from LHC pp collisions at a centre- of-mass energy sqrt(s) = 7 TeV. The mean decay width Gamma_s and the transversity amplitudes |A0(0)|^2 and |A||(0)|^2 are also measured. The values reported for these parameters are: phi_s = 0.22 \pm 0.41 (stat.) \pm 0.10 (syst.) rad Delta Gamma_s = 0.053 \pm 0.021 (stat.) \pm 0.008 (syst.) ps-1 Gamma_s = 0.677 \pm 0.007 (stat.) \pm 0.004 (syst.) ps-1 |A0(0)|^2 = 0.528 \pm 0.006 (stat.) \pm 0.009 (syst.) |A||(0)|^2 = 0.220 \pm 0.008 (stat.) \pm 0.007 (syst.) where the values quoted for phi_s and Delta Gamma_s correspond to the solution compatible with the external measurements to which the strong phase delta perpendicular is constrained and where Delta Gamma_s is constrained to be positive. The fraction of S-wave KK or f0 contamination through the decays Bs -> J/psi K+K-(f0) is measured as well and is found to be consistent with zero. Results for phi_s and Delta Gamma_s are also presented as 68%, 90% and 95% likelihood contours, which show agreement with Standard Model expectations.
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Submitted on : Friday, August 3, 2012 - 9:25:40 AM
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G. Aad, S. Albrand, Q. Buat, B. Clement, J. Collot, et al.. Time-dependent angular analysis of the decay Bs -> J/psi phi and extraction of Delta Gamma_s and the CP-violating weak phase phi_s by ATLAS. Journal of High Energy Physics, Springer, 2012, 12, pp.072. ⟨10.1007/JHEP12(2012)072⟩. ⟨in2p3-00722676⟩

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