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Aaij, R, Beteta, C Abellan, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Aidala, CA, Aiola, S, Ajaltouni, Z, Akar, S et al (show 905 more authors) , Albicocco, P, Albrecht, J, Alessio, F, Alexander, M, Albero, A Alfonso, Alkhazov, G, Cartelle, P Alvarez, Alves, AA Jr, Amato, S, Amhis, Y, An, L, Anderlini, L, Andreassi, G, Andreotti, M, Archilli, F, d'Argent, P, Romeu, J Arnau, Artamonov, A, Artuso, M, Arzymatov, K, Aslanides, E, Atzeni, M, Audurier, B, Bachmann, S, Back, JJ, Baker, S, Balagura, V, Baldini, W, Baranov, A, Barlow, RJ, Barsuk, S, Barter, W, Bartolini, M, Baryshnikov, F, Bassi, G, Batozskaya, V, Batsukh, B, Battig, A, Battista, V, Bay, A, Becker, M, Bedeschi, F, Bediaga, I, Beiter, A, Bel, LJ, Belavin, V, Belin, S, Beliy, N, Bellee, V, Belous, K, Belyaev, I, Ben-Haim, E, Bencivenni, G, Benson, S, Beranek, S, Berezhnoy, A, Bernet, R, Berninghoff, D, Bertholet, E, Bertolin, A, Betancourt, C, Betti, F, Bettler, MO, Beuzekom, M van, Bezshyiko, Ia, Bhasin, S, Bhom, J, 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(2019)
Updated measurement of time-dependent <i>CP</i>-violating observables in <i>B<sub>s</sub><SUP>0</SUP> →</i> J/ψ <i>K</i><SUP>+</SUP><i>K</i><SUP>-</SUP> decays.
EUROPEAN PHYSICAL JOURNAL C, 79 (8).
706-.
Abstract
The decay-time-dependent $CP$ asymmetry in $B^{0}_{s}\to J/\psi K^{+} K^{-}$
decays is measured using proton-proton collision data, corresponding to an
integrated luminosity of $1.9\,\mathrm{fb^{-1}}$, collected with the LHCb
detector at a centre-of-mass energy of $13\,\mathrm{TeV}$ in 2015 and 2016.
Using a sample of approximately 117\,000 signal decays with an invariant $K^{+}
K^{-}$ mass in the vicinity of the $\phi(1020)$ resonance, the $CP$-violating
phase $\phi_s$ is measured, along with the difference in decay widths of the
light and heavy mass eigenstates of the $B^{0}_{s}$-$\bar{B}^{0}_{s}$ system,
$\Delta\Gamma_s$. The difference of the average $B^{0}_{s}$ and $B^{0}$ meson
decay widths, $\Gamma_s-\Gamma_d$, is determined using in addition a sample of
$B^{0} \to J/\psi K^{+} \pi^{-}$ decays. The values obtained are $\phi_s =
-0.083\pm0.041\pm0.006\,\mathrm{rad}$, $\Delta\Gamma_s = 0.077 \pm 0.008 \pm
0.003\, \mathrm{ps^{-1}}$ and $\Gamma_s-\Gamma_d = -0.0041 \pm 0.0024 \pm
0.0015\,\mathrm{ps^{-1}}$, where the first uncertainty is statistical and the
second systematic. These are the most precise single measurements of these
quantities to date and are consistent with expectations based on the Standard
Model and with a previous LHCb analysis of this decay using data recorded at
centre-of-mass energies 7 and 8 TeV. Finally, the results are combined with
recent results from $B^{0}_{s}\to J/\psi \pi^{+} \pi^{-}$ decays obtained using
the same dataset as this analysis, and with previous independent LHCb results.
Item Type: |
Article
|
Additional Information: |
All figures and tables, along with any supplementary material and
additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2019-013.html |
Uncontrolled Keywords: |
hep-ex, hep-ex |
Depositing User: |
Symplectic Admin
|
Date Deposited: |
20 Feb 2020 11:00 |
Last Modified: |
17 Oct 2023 13:18 |
DOI: |
10.1140/epjc/s10052-019-7159-8 |
Related URLs: |
|
URI: |
https://livrepository.liverpool.ac.uk/id/eprint/3075871 |