Measurement of the CP-violating phase φs in B0 s → J/ψφ decays in ATLAS at 13 TeV

ATLAS Publications, M. Faucci Giannelli, A. Hasib, M.P. Heath, X. Hoad, S. Palazzo, A. Søgaard, A. Strubig, E.P. Takeva, A.J. Taylor, A. Washbrook

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

A measurement of the B0s → J/ψφ decayparameters using 80.5 fb−1 of integrated luminosity collected with the ATLAS detector from 13 TeV proton–proton collisions at the LHC is presented. The measured parameters include the CP-violating phase φs , the width difference s between the B0
s meson mass eigenstates and the average decay width s . The values measured for the physical parameters are combined with those from 19.2 fb−1 of 7 and 8 TeV data, leading to the following: φs = −0.087 ± 0.036 (stat.) ± 0.021 (syst.) rad s = 0.0657 ± 0.0043 (stat.) ± 0.0037 (syst.) ps−1
s = 0.6703 ± 0.0014 (stat.) ± 0.0018 (syst.) ps−1
Results for φs and s are also presented as 68% confi-
dence level contours in the φs –s plane. Furthermore the
transversity amplitudes and corresponding strong phases are
measured. φs and s measurements are in agreement with
the Standard Model predictions.
Original languageEnglish
Article number342
Pages (from-to)1-36
Number of pages36
JournalThe European Physical Journal C
Issue number4
Publication statusPublished - 21 Apr 2021


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