Measurement of the CP-violating phase $\phi_s$ and the $B^0_s$ meson decay width difference with $B^0_s \to J/\psi\phi$ decays in ATLAS - Université Clermont Auvergne Accéder directement au contenu
Article Dans Une Revue Journal of High Energy Physics Année : 2016

Measurement of the CP-violating phase $\phi_s$ and the $B^0_s$ meson decay width difference with $B^0_s \to J/\psi\phi$ decays in ATLAS

G. Aad (1) , S. Albrand (2) , J. Brown (2) , J. Collot (2) , S. Crépé-Renaudin (2) , P.A. Delsart (2) , C. Gabaldon (2) , M.H. Genest (2) , J.Y. Hostachy (2) , F. Ledroit-Guillon (2) , A. Lleres (2) , A. Lucotte (2) , F. Malek (2) , C. Monini (2) , J. Stark (2) , B. Trocmé (2) , M. Wu (2) , G. Rahal (3) , Z. Barnovska (4) , N. Berger (4) , M. Delmastro (4) , L. Di Ciaccio (4) , S. Elles (4) , T. Hryn’ova (4) , S. Jézéquel (4) , I. Koletsou (4) , R. Lafaye (4) , Jérémy Lévêque (4) , N. Massol (4) , P. Mastrandea (4) , G. Sauvage (4) , E. Sauvan (4) , O. Simard (4) , T. Todorov (4) , I. Wingerter-Seez (4) , E. Yatsenko (4) , L. Alio (1) , M. Barbero (1) , Y. Coadou (1) , C. Diaconu (1) , Sara Diglio (1) , F. Djama (1) , O. Duccu (1) , L. Feligioni (1) , J. Gao (1) , G.D. Hallewell (1) , F. Hubaut (1) , S.J. Kahn (1) , E. B. F. G. Knoops (1) , E. Le Guirriec (1) , J. Liu (1) , K. Liu (1) , D. Madaffari (1) , K. Mochizuki (1) , E. Monnier (1) , S. Muanza (1) , Y. Nagai (1) , E. Nagy (1) , P. Pralavorio (1) , A. Rozanov (1) , T. Serre (1) , M. Talby (1) , R.E. Ticse Torres (1) , E. Tiouchichine (1) , S. Tisserant (1) , J. Toth (1) , F. Touchard (1) , L. Vacavant (1) , D. Boumediene (5) , E. Busato (5) , D. Calvet (5) , S. Calvet (5) , J. Donini (5) , E. Dubreuil (5) , G. Gilles (5) , Ph. Gris (5) , H. Liao (5) , R. Madar (5) , D. Pallin (5) , S.M. Romano Saez (5) , C. Santoni (5) , D. Simon (5) , T. Theveneaux-Pelzer (5) , F. Vazeille (5) , M.K. Ayoub (6) , A. Bassalat (6) , S. Binet (6) , C. Becot , C. Bourdarios (6) , J.B. de Vivie De Regie (6) , D. Delgove (6) , L. Duflot (6) , M. Escalier (6) , L. Fayard (6) , D. Fournier (6) , E.L. Gkougkousis (6) , J.-F. Grivaz (6) , T. Guillemin (6) , F. Hariri (6) , S. Henrot-Versille (6) , J. Hrivnac (6) , L. Iconomidou-Fayard (6) , M. Kado (6) , A. Lounis (6) , N. Makovec (6) , N. Morange (6) , C. Nellist (6) , P. Petroff (6) , L. Poggioli (6) , P. Puzo (6) , A. Renaud (6) , G. Rybkin (6) , D. Rousseau (6) , A.C. Schaffer (6) , L. Serin (6) , E. Scifo (6) , S. Simion (6) , R. Tanaka (6) , D. Zerwas (6) , Zhongkai Zhang (6) , Y. Zhao (6)
G. Aad
N. Berger
T. Hryn’ova
Y. Coadou
S. Calvet
C. Becot
  • Fonction : Auteur
D. Rousseau

Résumé

A measurement of the $B^0_s$ decay parameters in the $B^0_s \to J/\psi\phi$ channel using an integrated luminosity of 14.3 $\mathrm{fb}^{-1}$ collected by the ATLAS detector from 8 TeV $pp$ collisions at the LHC is presented. The measured parameters include the $CP$-violating phase $\phi_s$, the decay width $\Gamma_s$ and the width difference between the mass eigenstates $\Delta\Gamma_s$. The values measured for the physical parameters are statistically combined with those from 4.9 $\mathrm{fb}^{-1}$ of 7 TeV data, leading to the following: \begin{eqnarray*} \phi_s & = & -0.098 \pm 0.084\;\mathrm{(stat.)} \pm 0.040\;\mathrm{(syst.)\;rad} \\ \Delta\Gamma_s & = & 0.083 \pm 0.011\;\mathrm{(stat.)} \pm 0.007\;\mathrm{(syst.)\;ps}^{-1} \\ \Gamma_s & = & 0.677 \pm 0.003\;\mathrm{(stat.)} \pm 0.003\;\mathrm{(syst.)\;ps}^{-1}. \end{eqnarray*} In the analysis the parameter $\Delta\Gamma_s$ is constrained to be positive. Results for $\phi_s$ and $\Delta\Gamma_s$ are also presented as 68% and 95% likelihood contours in the $\phi_s$-$\Delta\Gamma_s$ plane. Also measured in this decay channel are the transversity amplitudes and corresponding strong phases. All measurements are in agreement with the Standard Model predictions.

Dates et versions

in2p3-01255785 , version 1 (14-01-2016)

Identifiants

Citer

G. Aad, S. Albrand, J. Brown, J. Collot, S. Crépé-Renaudin, et al.. Measurement of the CP-violating phase $\phi_s$ and the $B^0_s$ meson decay width difference with $B^0_s \to J/\psi\phi$ decays in ATLAS. Journal of High Energy Physics, 2016, 08, pp.147. ⟨10.1007/JHEP08(2016)147⟩. ⟨in2p3-01255785⟩
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