Updated measurement of time-dependent \(CP\)-violating observables in \({{B} ^0_{s}} \rightarrow J/\psi K^+ K^-\) decays
2019
- Roel Aaij
- C. Abellan Beteta
- Thomas Ackernley
- Bernardo Adeva
- Marco Adinolfi
- Hossein 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
- Andrei Artamonov
- Marina Artuso
- Kenenbek Arzymatov
- Elie Aslanides
- Michele Atzeni
- Benjamin Audurier
- Sebastian Bachmann
- John Back
- Stephen Baker
- Vladislav Balagura
- W Baldini
- Alexander Baranov
- Rj Barlow
- Sergey Barsuk
- William Barter
- Matteo Bartolini
- Fedor Baryshnikov
- Giovanni Bassi
- V. Batozskaya
- Baasansuren Batsukh
- Alexander Battig
- Vincenzo Battista
- Aurelio Bay
- Maik Becker
- F. Bedeschi
- Ignacio Bediaga
- Andrew Beiter
- Lennaert Bel
- Vladislav Belavin
- Samuel Belin
- Nikita Beliy
- V. Bellee
- K. Belous
- Ivan Belyaev
- Eli Ben-Haim
- G. Bencivenni
- Sean Benson
- Sarah Beranek
- Alexander Berezhnoy
- Roland Bernet
- Daniel Berninghoff
- Emilie Bertholet
- A. Bertolin
- Christopher Betancourt
- F. Betti
- M. O. Bettler
- M van Beuzekom
- Ia. Bezshyiko
- Srishti Bhasin
- Jihyun Bhom
- Martin Stefan Bieker
- Simone Bifani
- P. Billoir
- Alex Birnkraut
- A Bizzeti
- Mikkel Bjørn
- Michele Piero Blago
- Thomas Blake
- F. Blanc
- Steven Blusk
- Dana Bobulska
- Valerio Bocci
- O. Boente Garcia
- Thomas Boettcher
- Alexey Boldyrev
- A. E. Bondar
- N. Bondar
- Silvia Borghi
- Maxim Borisyak
- M. Borsato
- Jozef Tomasz Borsuk
- Meriem Boubdir
- T. J. V. Bowcock
- C Bozzi
- 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
- Alessandro Cardini
- Paolo Carniti
- K. Carvalho Akiba
- A. Casais Vidal
- Gianluigi Casse
- Marco Cattaneo
- Giovanni Cavallero
- R. Cenci
- Jacopo Cerasoli
- Michael Chapman
- Matthew Charles
- Ph. Charpentier
- Georgios Chatzikonstantinidis
- M. Chefdeville
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- Chao Chen
- Shenjian Chen
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- Stefan-Gabriel Chitic
- Veronika Chobanova
- Marcin Chrzaszcz
- Alexsei Chubykin
- P. Ciambrone
- Maria Flavia Cicala
- X. Cid Vidal
- Gregory Ciezarek
- Federico Cindolo
- Pel Clarke
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- Harry Cliff
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- 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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