1993/11/14 by S. Kumano, Kumano, S.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.hep-ph/9311289
openalex publication_date 1993/11/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
1) We discuss a sum rule of the tensor structure function b1(x) for spin-one hadrons along with the Gottfried sum rule. Both sum rules are similar in the sense that they are phenomenological ones based on a naive parton model. As the Gottfried sum rule became useful for studying SU(2)flavor breaking in antiquark distributions, the b1 sum rule could provide important information on sea-quark tensor polarization. 2) Pionic contributions to the antiquark distribution u- d and violation of the Gottfried sum rule are discussed. We find that the contributions account for about half of the discrepancy found by the New Muon Collaboration between their result and the sum rule. In order to distinguish various theoretical explanations, we need independent experimental tests, for example, by using Drell-Yan processes. As an application of mesonic calculations, the difference between strange and antistrange quark distributions in the nucleon is briefly discussed.