Test of lepton universality with B0 - K*0е+е - decays
| Parent link: | Journal of High Energy Physics Vol. 2017.— 2017.— [128, 18 p.] |
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| Corporate Author: | |
| Other Authors: | , , , , |
| Summary: | Title screen A test of lepton universality, performed by measuring the ratio of the branching fractions of the B0 - K*0[mu]+[mu] - and B0 - K*0e+e- decays, RK*0RK*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/c2 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, q2, to be RK*0={0.66+−0.11/0.07(stat)+-0.03(syst) for 0.045<q2<1.1GeV2/c4, 0.69+−0.11/0.07(stat)+-0.05(syst) for 1.1<q2<6.0GeV2/c4. 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 RK*0RK*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 q2 regions, respectively. |
| Language: | English |
| Published: |
2017
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| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP08(2017)055 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=656580 |