Test of lepton universality with B0 - K*0е+е - decays; Journal of High Energy Physics; Vol. 2017

Test of lepton universality with B0 - K*0е+е - decays

Bibliografiske detaljer
Parent link:Journal of High Energy Physics
Vol. 2017.— 2017.— [128, 18 p.]
Institution som forfatter: Национальный исследовательский Томский политехнический университет (ТПУ) Физико-технический институт (ФТИ) Кафедра прикладной физики (№ 12) (ПФ)
Andre forfattere: Aaij R. Roel, Adeva B. Bernardo, Adinolfi M., Ajaltouni Z. J. Zeina, Vagner A. R. Aleksandr Rudolfovich
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.
Sprog:engelsk
Udgivet: 2017
Fag:
электронный ресурс
труды учёных ТПУ
B physics
branching fraction
Hadron-Hadron scattering (experiments)
rare decay
физика
распад
лептонные распады
лептонные процессы
ветвящиеся фракции
Online adgang:https://doi.org/10.1007/JHEP08(2017)055
Format: Electronisk Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=656580

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