A measurement of the ratio of branching fractions of the decays B+→K+μ+μ-and B+→K+e+e-is presented. The proton-proton collision data used correspond to an integrated luminosity of 5.0 fb-1 recorded with the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV. For the dilepton mass-squared range 1.1<6.0 GeV2/c4 the ratio of branching fractions is measured to be RK=0.846-0.054+0.060-0.014+0.016, where the first uncertainty is statistical and the second systematic. This is the most precise measurement of RK to date and is compatible with the standard model at the level of 2.5 standard deviations.
(2019). Search for Lepton-Universality Violation in B+ → K+l+l- Decays [journal article - articolo]. In PHYSICAL REVIEW LETTERS. Retrieved from https://hdl.handle.net/10446/266135
Search for Lepton-Universality Violation in B+ → K+l+l- Decays
Lupato A;Redi F;
2019-01-01
Abstract
A measurement of the ratio of branching fractions of the decays B+→K+μ+μ-and B+→K+e+e-is presented. The proton-proton collision data used correspond to an integrated luminosity of 5.0 fb-1 recorded with the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV. For the dilepton mass-squared range 1.1<6.0 GeV2/c4 the ratio of branching fractions is measured to be RK=0.846-0.054+0.060-0.014+0.016, where the first uncertainty is statistical and the second systematic. This is the most precise measurement of RK to date and is compatible with the standard model at the level of 2.5 standard deviations.| File | Dimensione del file | Formato | |
|---|---|---|---|
|
PhysRevLett.122.191801.pdf
accesso aperto
Versione:
publisher's version - versione editoriale
Licenza:
Creative commons
Dimensione del file
397.54 kB
Formato
Adobe PDF
|
397.54 kB | Adobe PDF | Visualizza/Apri |
Pubblicazioni consigliate
Aisberg ©2008 Servizi bibliotecari, Università degli studi di Bergamo | Terms of use/Condizioni di utilizzo
