Updated measurement of time-dependent $$CP$$ CP -violating observables in $${{B} ^0_{s}} \rightarrow J/\psi K^+ K^-$$ B s 0 → J / ψ K + K - decays
2019
- Roel Aaij
- C. Abellan Beteta
- T. Ackernley
- Bernardo Adeva
- Marco Adinolfi
- H. Afsharnia
- Christine Angela Aidala
- Salvatore Aiola
- Ziad Ajaltouni
- Simon Akar
- Pietro Albicocco
- Johannes Albrecht
- Federico Alessio
- M. Alexander
- A. Alfonso Albero
- Georgy Alkhazov
- P. Alvarez Cartelle
- Antonio Augusto Alves Jr
- Sandra Amato
- Yasmine Amhis
- L. An
- Lucio Anderlini
- Guido Andreassi
- M. Andreotti
- Flavio Archilli
- Philippe d'Argent
- J. Arnau Romeu
- A Artamonov
- Marina Artuso
- Kenenbek Arzymatov
- E. Aslanides
- Michele Atzeni
- Benjamin Audurier
- Sebastian Bachmann
- John Back
- Stephen Baker
- Vladislav Balagura
- Wander Baldini
- Alexander Baranov
- Rj Barlow
- Sergey Barsuk
- William Barter
- Matteo Bartolini
- Fedor Baryshnikov
- G. Bassi
- V. Batozskaya
- Baasansuren Batsukh
- Alexander Battig
- Vincenzo Battista
- A. Bay
- M. Becker
- F. Bedeschi
- Ignacio Bediaga
- Andrew Beiter
- Lennaert Bel
- Vladislav Belavin
- Samuel Belin
- Nikita Beliy
- Violaine Bellee
- Konstantin Belous
- I. Belyaev
- E. Ben-Haim
- G. Bencivenni
- Sean Benson
- S. Beranek
- Alexander Berezhnoy
- Roland Bernet
- Daniel Berninghoff
- E. Bertholet
- A. Bertolin
- Christopher Betancourt
- Federico Betti
- M. O. Bettler
- M van Beuzekom
- Ia. Bezshyiko
- Srishti Bhasin
- Jihyun Bhom
- Martin Stefan Bieker
- Simone Bifani
- Pierre Billoir
- Alex Birnkraut
- A Bizzeti
- Mikkel Bjørn
- Michele Piero Blago
- T. Blake
- F. Blanc
- Steven Blusk
- Dana Bobulska
- Valerio Bocci
- O. Boente Garcia
- Thomas Boettcher
- Alexey Boldyrev
- A. E. Bondar
- N. Bondar
- Silvia Borghi
- Silvia Borghi
- Maxim Borisyak
- M. Borsato
- J. T. Borsuk
- Meriem Boubdir
- T. J. V. Bowcock
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- Svende Braun
- A. Brea Rodriguez
- Michael Brodski
- Jolanta Brodzicka
- A. Brossa Gonzalo
- Davide Brundu
- Emma Buchanan
- Annarita Buonaura
- Christopher Burr
- A Bursche
- Jordy Sebastiaan Butter
- J. Buytaert
- Wiktor Byczynski
- S Cadeddu
- H Cai
- R. Calabrese
- Stefano Cali
- Ryan Calladine
- Marta Calvi
- M. Calvo Gomez
- Alessandro Camboni
- P. Campana
- D. Campora Perez
- L. Capriotti
- A Carboné
- G. Carboni
- R. Cardinale
- A. Cardini
- P Carniti
- K. Carvalho Akiba
- A. Casais Vidal
- Gianluigi Casse
- Marco Cattaneo
- Giovanni Cavallero
- R. Cenci
- J. Cerasoli
- Michael Chapman
- Matthew Charles
- Matthew Charles
- Ph. Charpentier
- Georgios Chatzikonstantinidis
- M. Chefdeville
- Viktoriia Chekalina
- Chao Chen
- Shenjian Chen
- A. Chernov
- Stefan-Gabriel Chitic
- Veronika Chobanova
- Marcin Chrzaszcz
- Alexsei Chubykin
- P. Ciambrone
- M. F. Cicala
- X. Cid Vidal
- Gregory Ciezarek
- Federico Cindolo
- Pel Clarke
- Marco Clemencic
- Harry Cliff
- Joel Closier
- John Leslie Cobbledick
- Victor Coco
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The decay-time-dependent \(CP\) asymmetry in \({{B} ^0_{s}} \rightarrow J/\psi {{K} ^+} {{K} ^-} \) 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 \({{B} ^0_{s}} \)-\({{\overline{B}{}} {}^0_{s}} \) 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 \({{B} ^0} \rightarrow J/\psi {{K} ^+} {{\pi } ^-} \) decays. The values obtained are \(\phi _s = -0.083\pm 0.041\pm 0.006\mathrm { \,rad} \), \(\Delta \Gamma _s = 0.077 \pm 0.008 \pm 0.003 {\mathrm { \,ps^{-1}}} \) 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 \({{B} ^0_{s}} \rightarrow J/\psi {{\pi } ^+} {{\pi } ^-} \) decays obtained using the same dataset as this analysis, and with previous independent LHCb results.
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