Test of Lepton Universality Using B + → K + ℓ + ℓ − Decays
- R. Aaij
- B. Adeva
- M. Adinolfi
- A. A. Affolder
- Z. Ajaltouni
- S. Akar
- J. Albrecht
- F. Alessio
- Michael Thomas Alexander
- S. Ali
- G. Alkhazov
- P. Álvarez Cartelle
- Antonio Augusto Alves Junior
- S. Amato
- S. Amerio
- Y. Amhis
- L. An
- L. Anderlini
- J. Anderson
- R. Andreassen
- M. Andreotti
- J. E. Andrews
- R. B. Appleby
- O. Aquines Gutierrez
- F. Archilli
- A. Artamonov
- M. Artuso
- E. Aslanides
- G. Auriemma
- M. Baalouch
- S. Bachmann
- J. J. Back
- A. Badalov
- V. Balagura
- W. Baldini
- Roger John Barlow
- C. Barschel
- S. Barsuk
- W. Barter
- V. Batozskaya
- V. Battista
- A. Bay
- L. Beaucourt
- J. Beddow
- F. Bedeschi
- I. Bediaga
- S. Belogurov
- K. Belous
- I. Belyaev
- E. Ben-Haim
- G. Bencivenni
- S. Benson
- J. Benton
- Alexander Berezhnoy
- R. Bernet
- M.-O. Bettler
- M. van Beuzekom
- A. Bień
- S. Bifani
- T. Bird
- A. Bizzeti
- P. M. Bjørnstad
- T. Blake
- F. Blanc
- J. Blouw
- S. Blusk
- V. Bocci
- A. Bondar
- N. Bondar
- Walter Marcello Bonivento
- S. Borghi
- A. Borgia
- M. Borsato
- T. J. V. Bowcock
- E. Bowen
- C. Bozzi
- T. Brambach
- J. F. J. van den Brand
- J. Bressieux
- D. Brett
- M. Britsch
- T. Britton
- J. Brodzicka
- N. H. Brook
- H. Brown
- A. Bursche
- G. Busetto
- J. Buytaert
- S. Cadeddu
- R. Calabrese
- M. Calvi
- M. Calvo Gomez
- P. Campana
- D. H. Cámpora Pérez
- A. Carbone
- G. Carboni
- R. Cardinale
- A. Cardini
- L. Carson
- K. Carvalho Akiba
- MWM. Williams
Physical Review Letters · 2014 · American Physical Society
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Abstract
A measurement of the ratio of the branching fractions of the B(+) → K(+)μ(+)μ(-) and B(+) → K(+)e(+)e(-) decays is presented using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb(-1), recorded with the LHCb experiment at center-of-mass energies of 7 and 8 TeV. The value of the ratio of branching fractions for the dilepton invariant mass squared range 1 < q(2) < 6 GeV(2)/c(4) is measured to be 0.745(-0.074)(+0.090)(stat) ± 0.036(syst). This value is the most precise measurement of the ratio of branching fractions to date and is compatible with the standard model prediction within 2.6 standard deviations.