Test of lepton universality with B 0 → K *0 ℓ + ℓ − decays
- R. Aaij
- B. Adeva
- M. Adinolfi
- Z. Ajaltouni
- S. Akar
- J. Albrecht
- F. Alessio
- M. Alexander
- S. Ali
- G. Alkhazov
- P. Alvarez Cartelle
- A. A. Alves
- SAS. Amato
- S. Amerio
- Y. Amhis
- L. An
- L. Anderlini
- G. Andreassi
- M. Andreotti
- J. E. Andrews
- R. B. Appleby
- F. Archilli
- P. d’Argent
- J. Arnau Romeu
- A. Artamonov
- M. Artuso
- E. Aslanides
- G. Auriemma
- M. Baalouch
- I. Babuschkin
- S. Bachmann
- J. J. Back
- A. Badalov
- C. Baesso
- S. Baker
- V. Balagura
- W. Baldini
- A. Baranov
- R. J. Barlow
- C. Barschel
- S. Barsuk
- W. Barter
- F. Baryshnikov
- M. Baszczyk
- V. Batozskaya
- V. Battista
- A. Bay
- L. Beaucourt
- J. Beddow
- F. Bedeschi
- I. Bediaga
- A. Beiter
- L. J. Bel
- V. Bellee
- N. Belloli
- K. Belous
- I. Belyaev
- E. Ben-Haim
- G. Bencivenni
- S. Benson
- S. Beranek
- Alexander Berezhnoy
- R. Bernet
- D. Berninghoff
- A. Bertolin
- C. Betancourt
- F. Betti
- M.-O. Bettler
- M. van Beuzekom
- Ia. Bezshyiko
- S. Bifani
- P. Billoir
- A. Birnkraut
- A. Bitadze
- A. Bizzeti
- T. Blake
- F. Blanc
- J. Blouw
- S. Blusk
- V. Bocci
- T. Boettcher
- A. Bondar
- N. Bondar
- W. Bonivento
- I. Bordyuzhin
- A. Borgheresi
- S. Borghi
- M. Borisyak
- M. Borsato
- M. Borysova
- F. Bossu
- M. Boubdir
- T. J. V. Bowcock
- E. Bowen
- C. Bozzi
- S. Braun
- T. Britton
- J. Brodzicka
- E. Buchanan
- C. Burr
- STStephane T'Jampens
- MVM. Vesterinen
- CGCarla Göbel
Journal of High Energy Physics · 2017 · Springer Nature
1 views · 0 downloads
Abstract
A test of lepton universality, performed by measuring the ratio of the branching fractions of themeson is reconstructed in the final state K + π -, which is required to have an invariant mass within 100 MeV/c 2 of the known K * (892) 0 mass.The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of about 3 fb -1 , collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV.The ratio is measured in two regions of the dilepton invariant mass squared, q 2 , to be R K * 0 = 0.66 + 0.11 -0.07 (stat) ± 0.03 (syst) for 0.045 < q 2 < 1.1 GeV 2 /c 4 , 0.69 + 0.11 -0.07 (stat) ± 0.05 (syst) for 1.1 < q 2 < 6.0 GeV 2 /c 4 .The corresponding 95.4% confidence level intervals are [0.52,0.89] and [0.53, 0.94].The results, which represent the most precise measurements of R K * 0 to date, are compatible with the Standard Model expectations at the level of 2.1-2.3 and 2.4-2.5 standard deviations in the two q 2 regions, respectively.