0000000000484989
AUTHOR
K. Lipka
DIS structure functions and the double-spin asymmetry inρ0electroproduction within a Regge approach
The proton, neutron and deuteron structure functions ${F}_{2}{(x,Q}^{2})$ and ${g}_{1}{(x,Q}^{2}),$ measured at intermediate ${Q}^{2},$ are analyzed within a Regge approach. This analysis serves to fix the parameters of this scheme which are then used to calculate, in a unified Regge approach, the properties of ${\ensuremath{\rho}}^{0}$ meson electroproduction on the proton and the deuteron. In this way, the double-spin asymmetry observed at HERMES in ${\ensuremath{\rho}}^{0}$ electroproduction on the proton can be related to the anomalous behavior of the flavor-singlet part of the spin-dependent structure function ${g}_{1}{(x,Q}^{2})$ at small x.
The strong coupling constant: State of the art and the decade ahead
This document provides a comprehensive summary of the state-of-the-art, challenges, and prospects in the experimental and theoretical study of the strong coupling $\alpha_s$. The current status of the seven methods presently used to determine $\alpha_s$ based on: (i) lattice QCD, (ii) hadronic $\tau$ decays, (iii) deep-inelastic scattering and parton distribution functions fits, (iv) electroweak boson decays, hadronic final-states in (v) e+e-, (vi) e-p, and (vii) p-p collisions, and (viii) quarkonia decays and masses, are reviewed. Novel $\alpha_s$ determinations are discussed, as well as the averaging method used to obtain the PDG world-average value at the reference Z boson mass scale, $\…