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Title: | Test of lepton universality with Λb0→pK− ℓ+ ℓ− decays |
Author: | LHCb Collaboration Alfonso Albero, Alejandro Calvo Gómez, Míriam Camboni, Alessandro Coquereau, Samuel Garrido Beltrán, Lluís Gascón Fora, David Gironella Gironell, Pere Golobardes, E. Graciani Díaz, Ricardo Graugés Pous, Eugeni Manera Escalero, R. Marin Benito, Carla Vázquez Gómez, Ricard Vilasis-Cardona, Xavier |
Keywords: | Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments |
Issue Date: | 11-May-2020 |
Publisher: | Springer Verlag |
Abstract: | The ratio of branching fractions of the decays Λ0b → pK−e+e− and Λ0b → pK−μ+μ−, R−1pK, is measured for the first time using proton-proton collision data corresponding to an integrated luminosity of 4.7 fb−1 recorded with the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV. In the dilepton mass-squared range 0.1 < q2 < 6.0 GeV2/c4 and the pK− mass range m(pK−) < 2600 MeV/c2, the ratio of branching fractions is measured to be R−1pK=1.17+0.18−0.16±0.07, where the first uncertainty is statistical and the second systematic. This is the first test of lepton universality with b baryons and the first observation of the decay Λ0b → pK−e+e−. |
Note: | Reproducció del document publicat a: https://doi.org/10.1007/JHEP05(2020)040 |
It is part of: | Journal of High Energy Physics, 2020, num. 40 |
URI: | http://hdl.handle.net/2445/185367 |
Related resource: | https://doi.org/10.1007/JHEP05(2020)040 |
ISSN: | 1126-6708 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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