TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Garcia Martin, L. M.
AU  - Henry, L.
AU  - Jashal, B. K.
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Remon Alepuz, C.
AU  - Ruiz Vidal, J.
AU  - Sanchez Mayordomo, C.
PY  - 2020
DA  - 2020//
TI  - Measurement of f(s)/f(u) Variation with Proton-Proton Collision Energy and B-Meson Kinematics
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 122002 - 11pp
VL  - 124
IS  - 12
PB  - Amer Physical Soc
AB  - The ratio of the B-s(0) and B+ fragmentation fractions f(s) and f(u) is studied with B-s(0) -> J/psi phi and B+ -> J/psi 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 sigma. This dependency is driven by the 13 TeV sample (8.7 sigma), while the results for the other collision energies are not significant when considered separately. Furthermore, the results show a 4.8 sigma evidence for an increase of f(s)/f(u) as a function of collision energy.
SN  - 0031-9007
UR  - https://arxiv.org/abs/1910.09934
UR  - https://doi.org/10.1103/PhysRevLett.124.122002
DO  - 10.1103/PhysRevLett.124.122002
LA  - English
N1  - WOS:000522195100005
ID  - LHCbCollaborationAaij_etal2020
ER  -