Sea-quark loop contributions to the d¯u¯ asymmetry in the proton

Author:

Leinweber Derek B.1ORCID,Thomas Anthony W.1ORCID

Affiliation:

1. Centre for the Subatomic Structure of Matter (CSSM), Department of Physics, University of Adelaide, SA 5005, Australia

Abstract

QCD interactions for equal-mass fermion flavors are flavor blind. This fact is often used to state that disconnected sea-quark loop contributions are equal for u and d quarks in the mass symmetric case and therefore these disconnected sea-quark loop contributions cannot contribute to the well-known d¯u¯ asymmetry in the proton. Instead, it is argued that one must look to the connected sector of lattice QCD correlation functions to find this difference. In this presentation, we note that these statements are true provided unphysical contributions in the sea-quark loop sector are included, contributions from baryons that do not appear in the physical spectrum. To respect the Pauli principle, these unphysical contributions from the disconnected sea-quark loop sector must cancel equally unphysical contributions in the connected sector. The remaining disconnected sea-quark loop contributions no longer have a balance between d¯ and u¯. Upon considering only physically observed baryons in the loop contributions, we illustrate an important contribution from the sea-quark loop sector to d¯u¯ that enhances the leading connected contribution by 12%. Published by the American Physical Society 2024

Funder

National Computational Infrastructure

Australian Research Council

Publisher

American Physical Society (APS)

Cited by 3 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Physical interpretation of the 2s excitation of the nucleon;Journal of Physics G: Nuclear and Particle Physics;2025-04-21

2. Flavor asymmetry from the nonperturbative nucleon sea;Physical Review C;2024-12-12

3. Magnetic polarizability of octet baryons via lattice QCD;Physical Review D;2024-10-18

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