Options
Evaluation of Bjorken polarised sum rule with a renormalon-motivated approach
Journal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Date Issued
2024-01-01
Author(s)
Abstract
We use the known renormalon structure of Bjorken polarised sum rule (BSR)
to evaluate the leading-twist part of that quantity. In addition, we include
and
Operator Product Expansion (OPE) terms and fit this expression to available experimental data for inelastic BSR. Since we use perturbative QCD (pQCD) coupling, which fails at low squared spacelike momenta
due to Landau singularities, the fit is performed for
where
. Due to large BSR experimental uncertainties, the extracted value of the pQCD coupling has very large uncertainties, especially when
is varied. However, when we fix the pQCD coupling to the known world average values, the
and
residue parameters can be determined within large but reasonable uncertainties.
to evaluate the leading-twist part of that quantity. In addition, we include
and
Operator Product Expansion (OPE) terms and fit this expression to available experimental data for inelastic BSR. Since we use perturbative QCD (pQCD) coupling, which fails at low squared spacelike momenta
due to Landau singularities, the fit is performed for
where
. Due to large BSR experimental uncertainties, the extracted value of the pQCD coupling has very large uncertainties, especially when
is varied. However, when we fix the pQCD coupling to the known world average values, the
and
residue parameters can be determined within large but reasonable uncertainties.
File(s)
