TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Garcia Martin, L. M.
AU  - Henry, L.
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Remon Alepuz, C.
AU  - Ruiz Valls, P.
AU  - Sanchez Mayordomo, C.
PY  - 2017
DA  - 2017//
TI  - Test of lepton universality with B-0 -> K*(0)l(+)l(-) decays
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 055
EP  - 31pp
VL  - 08
IS  - 8
PB  - Springer
KW  - B physics
KW  - Branching fraction
KW  - Hadron-Hadron scattering (experiments)
KW  - Rare decay
AB  - 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.
SN  - 1029-8479
UR  - http://arxiv.org/abs/1705.05802
UR  - https://doi.org/10.1007/JHEP08(2017)055
DO  - 10.1007/JHEP08(2017)055
LA  - English
N1  - WOS:000410888900003
ID  - LHCbCollaborationAaij_etal2017
ER  -