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Article Dans Une Revue Phys.Rev.D Année : 2022

Towards the determination of the gluon helicity distribution in the nucleon from lattice quantum chromodynamics

Colin Egerer
  • Fonction : Auteur
Bálint Joó
  • Fonction : Auteur
Joseph Karpie
  • Fonction : Auteur
Nikhil Karthik
  • Fonction : Auteur
Tanjib Khan
  • Fonction : Auteur
Christopher J. Monahan
  • Fonction : Auteur
Wayne Morris
  • Fonction : Auteur
Kostas Orginos
  • Fonction : Auteur
Anatoly Radyushkin
  • Fonction : Auteur
David G. Richards
  • Fonction : Auteur
Eloy Romero
  • Fonction : Auteur
Raza Sabbir Sufian
  • Fonction : Auteur

Résumé

We present the first exploratory lattice quantum chromodynamics (QCD) calculation of the polarized gluon Ioffe-time pseudo-distribution in the nucleon. The Ioffe-time pseudo-distribution provides a frame-independent and gauge-invariant framework to determine the gluon helicity in the nucleon from first principles. We employ a high-statistics computation using a $32^3\times 64$ lattice ensemble characterized by a $358$ MeV pion mass and a $0.094$ fm lattice spacing. We establish the pseudo-distribution approach as a feasible method to address the proton spin puzzle with successive improvements in statistical and systematic uncertainties anticipated in the future. Within the statistical precision of our data, we find a good comparison between the lattice determined polarized gluon Ioffe-time distribution and the corresponding expectations from the state-of-the-art global analyses. We find a hint for a nonzero gluon spin contribution to the proton spin from the model-independent extraction of the gluon helicity pseudo-distribution over a range of Ioffe-time, $\nu\lesssim 9$.

Dates et versions

hal-03758535 , version 1 (23-08-2022)

Identifiants

Citer

Colin Egerer, Bálint Joó, Joseph Karpie, Nikhil Karthik, Tanjib Khan, et al.. Towards the determination of the gluon helicity distribution in the nucleon from lattice quantum chromodynamics. Phys.Rev.D, 2022, 106 (9), pp.094511. ⟨10.1103/PhysRevD.106.094511⟩. ⟨hal-03758535⟩
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