Work

Quark and Gluon Momentum Fractions in the Pion and in the Kaon

Year: 2025

Type: article

Abstract: We present the full decomposition of the momentum fraction carried by quarks and gluons in the pion and the kaon. We employ three gauge ensembles generated with N_{f}=2+1+1 Wilson twisted-mass clover-improved fermions at the physical quark masses. For both mesons we perform a continuum extrapolation directly at the physical pion mass, which allows us to determine for the first time the momentum decomposition at the physical point. We find that the total momentum fraction carried by quarks is 0.575(79) and 0.683(50) and by gluons 0.402(53) and 0.422(67) in the pion and in the kaon, respectively, in the MS[over ¯] scheme and at the renormalization scale of 2 GeV. Having computed both the quark and gluon contributions in the continuum limit, we find that the momentum sum is 0.984(89) for the pion and 1.13(11) for the kaon, verifying the momentum sum rule.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.134.131902

Authors: Constantia Alexandrou, Simone Bacchio, Martha Constantinou, Joseph Delmar, Jacob Finkenrath, Bartosz Kostrzewa, Marcus Petschlies, Luis Alberto Rodriguez Chacon, Gregoris Spanoudes, Fernanda Steffens, Carsten Urbach, Urs Wenger

Institutions: Cyprus Institute, University of Cyprus, Temple University, University of Wuppertal, University of Bonn, Istituto Nazionale di Fisica Nucleare, University of Ferrara, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara, University of Bern

Language: English

Topic: Quantum Chromodynamics and Particle Interactions

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,750

Funders: U.S. Department of Energy, University of Texas at Austin, Deutsche Forschungsgemeinschaft, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Research and Innovation Foundation, CSC – IT Center for Science, Centro Svizzero di Calcolo Scientifico, European Regional Development Fund, Nuclear Physics, Northwest Fisheries Science Center, HORIZON EUROPE Marie Sklodowska-Curie Actions

Awards: G183449385, G1847502558, Nonperturbative aspects of Quantum Chromodynamics, G3217676064, G3246118207, Nucleon structure at the precision frontier using lattice QCD with physical up, down, strange, and charm quarks, G3861303033, Non-Perturbative Quantization of Topological Excitations in Quantum Field Theory and Quantum Spin Systems, Nonperturbative aspects of strongly interacting quantum field theories, G5699522490, G67695376, Advanced computing, quantum algorithms, and data-driven approaches for science, technology and engineering, G7217220695, Unraveling the 3D parton structure of the nucleon with lattice QCD, G8201664428, G931119319

OpenAlex ID: W4409014113

FWCI: 6.628

Cites: 51

Cited by: 14

Related to: 10