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  4. Measurement off f(s)/f(u) Variation with Proton-Proton Collision Energy and B-Meson Kinematics
 
research article

Measurement off f(s)/f(u) Variation with Proton-Proton Collision Energy and B-Meson Kinematics

Aaij, R.
•
Beteta, C. Abellan
•
Adeva, B.
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March 26, 2020
Physical Review Letters

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.

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Type
research article
DOI
10.1103/PhysRevLett.124.122002
Web of Science ID

WOS:000522195100005

Author(s)
Aaij, R.
Beteta, C. Abellan
Adeva, B.
Adinolfi, M.
Aidala, C. A.
Ajaltouni, Z.
Akar, S.
Albicocco, P.
Albrecht, J.
Alessio, F.
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Date Issued

2020-03-26

Publisher

AMER PHYSICAL SOC

Published in
Physical Review Letters
Volume

124

Issue

12

Article Number

122002

Subjects

Physics, Multidisciplinary

•

Physics

•

decay

•

fractions

•

quark

•

ratio

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPHE  
Available on Infoscience
April 12, 2020
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/168150
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