Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 8, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP08(2017)055
Keywords
B physics; Branching fraction; Hadron-Hadron scattering (experiments); Rare decay
Categories
Funding
- CERN
- CAPES (Brazil)
- CNPq (Brazil)
- FAPERJ (Brazil)
- FINEP (Brazil)
- MOST (China)
- NSFC (China)
- CNRS/IN2P3 (France)
- BMBF (Germany)
- DFG (Germany)
- MPG (Germany)
- INFN (Italy)
- NWO (The Netherlands)
- MNiSW (Poland)
- NCN (Poland)
- MEN/IFA (Romania)
- MinES (Russia)
- FASO (Russia)
- MinECo (Spain)
- SNSF (Switzerland)
- SER (Switzerland)
- NASU (Ukraine)
- STFC (United Kingdom)
- NSF (U.S.A.)
- Science and Technology Facilities Council [ST/N000331/1, ST/K003410/1, ST/J004332/1, 1708182, 1707993, GRIDPP, LHCb Upgrades, ST/N000250/1, ST/G005974/1, LHCb, 1641747, 1369397, ST/H006737/1, 1565116, 1416165, 1514623, ST/N000234/1] Funding Source: researchfish
- STFC [ST/J004332/1, LHCb, LHCb Upgrades, 1641747, ST/K003410/1, ST/G005974/1, ST/N000234/1, 1708182, ST/N000331/1, ST/H006737/1, 1707993] Funding Source: UKRI
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A test of lepton universality, performed by measuring the ratio of the branching fractions of the B-0 -> K*(0)mu(+) mu(-) and B-0 -> K*e(+)e(-) decays, R-K*0, is presented. The K*(0) meson is reconstructed in the final state K+pi(-), 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(-0.007)(+0.11)(stat) +/- 0.03(syst) for 0.045 < q(2) < GeV2/c(4), 0.69(-0.07)(+0.11)(stat) +/- 0.05(syst) for 1.1 < q(2) < 6.0 GeV2/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.
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