Test of Lepton Universality Using B[superscript +] → K[superscript +]ℓ[superscript +]ℓ[superscript −] Decays
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PhysRevLett.113.151601.pdf
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Affolder, A.
Ajaltouni, Z.
Akar, S.
Albrecht, J.
Alessio, F.
Alexander, M.
Ali, S.
Date Issued
October 2014
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, et al. “Test of Lepton Universality Using B[superscript +] → K[superscript +]ℓ[superscript +]ℓ[superscript −] Decays.” Physical Review Letters 113, no. 15 (October 2014).
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.113.151601
