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Flavour tagged time-dependent angular analysis of the $B_s \rightarrow J/\psi \phi$ decay and extraction of $\Delta\Gamma$ and the weak phase $\phi_s$ in ATLAS

By G. Aad, S. Abdel Khalek, A. Bassalat, C. Becot, S. Binet, C. Bourdarios, D. Charfeddine, J.B. De Vivie De Regie, L. Duflot, M. Escalier, L. Fayard, D. Fournier, J.-F. Grivaz, T. Guillemin, S. Henrot-Versillé, J. Hrivnac, L. Iconomidou-Fayard, M. Kado, A. Lounis, N. Makovec, P. Matricon, L. Poggioli, P. Puzo, A. Renaud, D. Rousseau, G. Rybkin, A.C. Schaffer, E. Scifo, L. Serin, S. Simion, R. Tanaka, H.L. Tran, D. Zerwas, Z. Zhang, G. Rahal, D. Boumediene, Emmanuel Busato, D. Calvet, S. Calvet, J. Donini, E. Dubreuil, N. Ghodbane, Ph. Gris, C. Guicheney, H. Liao, D. Pallin, Daniela Paredes Hernández, F. Podlyski, C. Santoni, Timothée Theveneaux-Pelzer, Loïc Valery, F. Vazeille, S. Albrand, J. Brown, B. Clement, J. Collot, S. Crépé-Renaudin, B. Dechenaux, P.A. Delsart, C. Gabaldon, M.H. Genest, J.Y. Hostachy, B.T. Le, F. Ledroit-Guillon, A. Lleres, A. Lucotte, F. Malek, C. Monini, J. Stark, B. Trocmé, Z. Barnovska, N. Berger, M. Delmastro, L. Di Ciaccio, T.K.O. Doan, S. Elles, C. Goy, T. Hryn'Ova, S. Jézéquel, H. Keoshkerian, I. Koletsou, R. Lafaye, J. Leveque, V.P. Lombardo, N. Massol, H. Przysiezniak, G. Sauvage, E. Sauvan, M. Schwoerer, O. Simard, T. Todorov, I. Wingerter-Seez, L. Alio, M. Barbero, C. Bertella, J. C. Clémens, Y. Coadou, F. Djama, L. Feligioni, D. Hoffmann, F. Hubaut, E. B. F. G. Knoops, E. Le Guirriec, B. Li, D. Madaffari, K. Mochizuki, E. Monnier, S. Muanza, Y. Nagai, P. Pralavorio, A. Rozanov, T. Serre, M. Talby, N. Tannoury, E. Tiouchichine, S. Tisserant, J. Toth, F. Touchard, M. Ughetto and L. Vacavant

Abstract

26 pages plus author list + cover pages (54 pages total), 9 figures, 7 tables, submitted to PRD, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2013-01/ - See paper for full list of authorsA measurement of the $B_s \rightarrow J/\psi \phi$ decay parameters, updated to include flavour tagging is reported using $4.9 fb^{-1}$ of integrated luminosity collected by the ATLAS detector from $\sqrt{s}= 7$TeV $pp$ collisions recorded in 2011 at the LHC. The values measured for the physical parameters are: \begin{eqnarray*} \phi_s & = & 0.12 \pm 0.25(stat.)\pm 0.05(syst.)rad \\ \Delta\Gamma & = & 0.053 \pm 0.021(stat.) 0.010(syst.)ps^{-1} \\ \Gamma_s & = & 0.677 \pm 0.007 (stat.)\pm 0.004 (syst.)ps^{-1}\\ |A_{\parallel}(0)|^2 & = & 0.220 \pm 0.008 (stat.)\pm 0.009(syst.)\\ |A_{0}(0)|^2 & = & 0.529 \pm 0.006 (stat.)\pm 0.012(syst.)\\ \delta_\perp & = & 3.89 \pm 0.47(stat.) \pm 0.11(syst.)rad \end{eqnarray*} where the parameter $\Delta\Gamma$ is constrained to be positive. The $S$-wave contribution was measured and found to be compatible with zero. Results for $\phi_s$ and $\Delta\Gamma$ are also presented as $68\%$ and $95\%$ likelihood contours, which show agreement with the Standard Model expectations

Topics: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Publisher: 'American Physical Society (APS)'
Year: 2014
DOI identifier: 10.1103/PhysRevD.90.052007
OAI identifier: oai:HAL:in2p3-01022705v1
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