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Time-dependent angular analysis of the decay B0s → J / ψ φ and extraction of ΔΓ s and the CP-violating weak phase φ s by ATLAS

  • Author(s): Aad, G;
  • Abajyan, T;
  • Abbott, B;
  • Abdallah, J;
  • Abdel Khalek, S;
  • Abdelalim, AA;
  • Abdinov, O;
  • Aben, R;
  • Abi, B;
  • Abolins, M;
  • Abouzeid, OS;
  • Abramowicz, H;
  • Abreu, H;
  • Acerbi, E;
  • Acharya, BS;
  • Adamczyk, L;
  • Adams, DL;
  • Addy, TN;
  • Adelman, J;
  • Adomeit, S;
  • Adragna, P;
  • Adye, T;
  • Aefsky, S;
  • Aguilar-Saavedra, JA;
  • Agustoni, M;
  • Aharrouche, M;
  • Ahlen, SP;
  • Ahles, F;
  • Ahmad, A;
  • Ahsan, M;
  • Aielli, G;
  • Akdogan, T;
  • Åkesson, TPA;
  • Akimoto, G;
  • Akimov, AV;
  • Alam, MS;
  • Alam, MA;
  • Albert, J;
  • Albrand, S;
  • Aleksa, M;
  • Aleksandrov, IN;
  • Alessandria, F;
  • Alexa, C;
  • Alexander, G;
  • Alexandre, G;
  • Alexopoulos, T;
  • Alhroob, M;
  • Aliev, M;
  • Alimonti, G;
  • Alison, J;
  • Allbrooke, BMM;
  • Allport, PP;
  • Allwood-Spiers, SE;
  • Almond, J;
  • Aloisio, A;
  • Alon, R;
  • Alonso, A;
  • Alonso, F;
  • Alvarez Gonzalez, B;
  • Alviggi, MG;
  • Amako, K;
  • Amelung, C;
  • Ammosov, VV;
  • Amorim, A;
  • Amram, N;
  • Anastopoulos, C;
  • Ancu, LS;
  • Andari, N;
  • Andeen, T;
  • Anders, CF;
  • Anders, G;
  • Anderson, KJ;
  • Andreazza, A;
  • Andrei, V;
  • Anduaga, XS;
  • Anger, P;
  • Angerami, A;
  • Anghinolfi, F;
  • Anisenkov, A;
  • Anjos, N;
  • Annovi, A;
  • Antonaki, A;
  • Antonelli, M;
  • Antonov, A;
  • Antos, J;
  • Anulli, F;
  • Aoki, M;
  • Aoun, S;
  • Aperio Bella, L;
  • Apolle, R;
  • Arabidze, G;
  • Aracena, I;
  • Arai, Y;
  • Arce, ATH;
  • Arfaoui, S;
  • Arguin, JF;
  • Arik, E;
  • Arik, M;
  • Armbruster, AJ;
  • Arnaez, O
  • et al.
Abstract

A measurement of B0s → J /ψφ decay parameters, including the CP -violating weak phase φ s and the decay width difference ΔΓ 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 √s = 7 TeV. The mean decay width Γ s and the transversity amplitudes |A 0(0)|2 and |A arap;(0)|2 are also measured. The values reported for these parameters are: φs = 0.22 ± 0.41 (stat) ± 0.10 (syst) rad} ΔΓ s = 0.053 ± 0.021 (stat) ± 0.010 (sast) ps-1 Γ s = 0.677 ± 0.007 (stat) ± 0.004 (sast) ps-1 |A0(0)|2 = 0.528 ± 0.006 (stat) ± 0.009 (sast) |A0(0)|2 = 0.220 ± 0.008 (stat) ± 0.007 (sast) where the values quoted for φ s and ΔΓ s correspond to the solution compatible with the external measurements to which the strong phase δ ⊥ is constrained and where ΔΓ s is constrained to be positive. The fraction of S-wave KK or f 0 contamination through the decays B0s→ J /ψK + K-}}\left({{f-0}} \right)}} \right.} is measured as well and is found to be consistent with zero. Results for φ s and ΔΓ s are also presented as 68%, 90% and 95% likelihood contours, which show agreement with Standard Model expectations.[Figure not available: see fulltext.] © 2012 CERN for the benefit of the ATLAS collaboration.

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