Test of lepton universality using B+ →k+l+l- decays

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Aaij, R. ; Adeva, B. ; Adinolfi, M. ; Affolder, A. ; Ajaltouni, Z. ; Akar, S. ; Albrecht, J. ; Alessio, F. ; Alexander, M. ; Ali, S. ; Alkhazov, G. ; Alvarez Cartelle, P. ; Alves, A.A. ; Amato, S. ; Amerio, S. ; Amhis, Y. ; An, L. ; Anderlini, L. ; Anderson, J. ; Andreassen, R. ; Andreotti, M. ; Andrews, J.E. ; Appleby, R.B. ; Aquines Gutierrez, O. ; Archilli, F. ; Artamonov, A. ; Artuso, M. ; Aslanides, E. ; Auriemma, G. ; Baalouch, M. ... view all 700 authors (2014)
  • Publisher: American Physical Society
  • Journal: volume 113, page 151,601
  • Related identifiers: doi: 10.5167/uzh-107793, doi: 10.1103/PhysRevLett.113.151601
  • Subject: QC | Physics and Astronomy (all) | Particle Physics - Experiment | LHCb - Abteilung Hofmann | Physics Institute | High Energy Physics - Experiment | Settore FIS/04 - Fisica Nucleare e Subnucleare | Física nuclear | 530 Physics

A measurement of the ratio of the branching fractions of the B[superscript +] → K[superscript +]μ[superscript +]μ[superscript -] and B[superscript +] → K[superscript +]e[superscript +]e[superscript -] decays is presented using proton-proton collision data, corresponding to an integrated luminosity of 3.0  fb[superscript -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[superscript 2] < 6  GeV[superscript 2]/c[superscript 4] is measured to be 0.745[+0.090 over -0.074](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.
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