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Title

Time-dependent angular analysis of the decay Bs0 -> J/ψϕ and extraction of ΔΓs and the CP-violating weak phase ϕs by ATLAS

CollaborationWith : Abdelalim Aly, Ahmed Aly / Alexandre, Gauthier / Backes, Moritz / Barone, Gaetano / Bell, Paul / Bell, William / Benhar Noccioli, Eleonora / Blondel, Alain / Bucci, Francesca / Clark, Allan Geoffrey / Dao, Valerio / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Gonzalez Sevilla, Sergio / Goulette, Marc / Iacobucci, Giuseppe / La Rosa, Alessandro / Lister, Alison / Martin Dit Latour, Bertrand / Mermod, Philippe / Mora Herrera, Maria Clemencia Rosario / Nektarijevic, Snezana / Nikolics, Katalin / Pasztor, Arpad / Picazio, Attilio / Pohl, Martin / Rosbach, Kilian / Rosselet, Laurent / Wu, Xin
Published in Journal of High Energy Physics. 2012, vol. 72, p. 33
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 ∥(0)|2 are also measured. The values reported for these parameters are: ϕs=0.22±0.41 (stat.)±0.10 (syst.) rad; ΔΓs=0.053±0.021 (stat.)±0.010 (syst.) ps−1; Γs=0.677±0.007 (stat.)±0.004 (syst.) ps−1; |A0(0)|2=0.528±0.006 (stat.)±0.009 (syst.); |A∥(0)|2=0.220±0.008 (stat.)±0.007 (syst.) 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 ΔΓs is constrained to be positive. The fraction of S-wave KK or f 0 contamination through the decays B0s→J/ψK+K−(f0) 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.
Keywords Hadron-Hadron Scattering
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ATLAS COLLABORATION. Time-dependent angular analysis of the decay Bs0 -> J/ψϕ and extraction of ΔΓs and the CP-violating weak phase ϕs by ATLAS. In: Journal of High Energy Physics, 2012, vol. 72, p. 33. https://archive-ouverte.unige.ch/unige:39989

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Deposited on : 2014-09-05

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