Publications [#313583] of Ashutosh V. Kotwal

Papers Published
  1. 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, Time-dependent angular analysis of the decay B0s→ J / ψ φ and extraction of ΔΓsand the CP-violating weak phase φsby ATLAS, Journal of High Energy Physics, vol. 2012 no. 12 (December, 2012) [doi] .

    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.