The ratio of the B0s and B+ fragmentation fractions f_s and f_u is studied with B0s → J/ψ ϕ and B+ → J/ψ K+ 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 f_s/f_u is observed to depend on the B-meson transverse momentum with a significance of 6.0 σ. This dependency is driven by the 13 TeV sample (8.7 σ), while the results for the other collision energies are not significant when considered separately. Furthermore, the results show a 4.8 σ evidence for an increase of f_s/f_u as a function of collision energy.

Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2020). Measurement of f_s/f_u Variation with Proton-Proton Collision Energy and B-Meson Kinematics. PHYSICAL REVIEW LETTERS, 124(12), 1-11 [10.1103/PhysRevLett.124.122002].

Measurement of f_s/f_u Variation with Proton-Proton Collision Energy and B-Meson Kinematics

Betti, F.;Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Maccolini, S.;Manuzzi, D.;Patrignani, C.;Perazzini, S.;Pisani, F.;Zucchelli, S.
2020

Abstract

The ratio of the B0s and B+ fragmentation fractions f_s and f_u is studied with B0s → J/ψ ϕ and B+ → J/ψ K+ 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 f_s/f_u is observed to depend on the B-meson transverse momentum with a significance of 6.0 σ. This dependency is driven by the 13 TeV sample (8.7 σ), while the results for the other collision energies are not significant when considered separately. Furthermore, the results show a 4.8 σ evidence for an increase of f_s/f_u as a function of collision energy.
2020
Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2020). Measurement of f_s/f_u Variation with Proton-Proton Collision Energy and B-Meson Kinematics. PHYSICAL REVIEW LETTERS, 124(12), 1-11 [10.1103/PhysRevLett.124.122002].
Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C.A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albicocco, P.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/772371
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