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Time-dependent angular analysis of the decay B0s→ J / ψ φ and extraction of ΔΓsand the CP-violating weak phase φsby 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
  • et al.
Abstract

A measurement of B0s→ J /ψφ decay parameters, including the CP -violating weak phase φsand the decay width difference ΔΓsis reported, using 4.9 fb-1of 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 Γsand the transversity amplitudes |A0(0)|2and |Aarap;(0)|2are 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-1Γ 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 φsand ΔΓscorrespond to the solution compatible with the external measurements to which the strong phase δ⊥is constrained and where ΔΓsis constrained to be positive. The fraction of S-wave KK or f0contamination 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 φsand ΔΓsare 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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