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Title: Measurement off f(s)/f(u) Variation with Proton-Proton Collision Energy and B-Meson Kinematics
Author: Alfonso Albero, Alejandro
Calvo Gómez, Míriam
Camboni, Alessandro
Coquereau, Samuel
Garrido Beltrán, Lluís
Gascón Fora, David
Gironella Gironell, Pere
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
Vilasis-Cardona, Xavier
García Martín, L.M.
Henry, L.
Martínez Vidal, F.
Oyanguren Campos, Arantza de
Remon Alepuz, C.
Ruiz Vidal, J.
Sánchez Mayordomo, C.
LHCb Collaboration
Keywords: Cinemàtica
Mesons (Física nuclear)
Mesons (Nuclear physics)
Issue Date: 26-Mar-2020
Publisher: American Physical Society
Abstract: The ratio of the B0s and B+ fragmentation fractions fs and fu is studied with B0s→J/ψϕ and B+→J/ψK+ decays using data collected by the LHCb experiment in proton-proton collisions at 7, 8, and 13 TeV center-of-mass energies. The analysis is performed in bins of B-meson momentum, longitudinal momentum, transverse momentum, pseudorapidity, and rapidity. The fragmentation-fraction ratio fs/fu is observed to depend on the B-meson transverse momentum with a significance of 6.0σ. This dependency is driven by the 13 TeV sample (8.7σ), while the results for the other collision energies are not significant when considered separately. Furthermore, the results show a 4.8σ evidence for an increase of fs/fu as a function of collision energy.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2020, vol. 124, num. 12, p. 122002
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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