2000/04/16 by Susumu Koretune, Koretune, Susumu
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 #hep-ph #nucl-th
paper · pdf · doi:10.48550/arxiv.hep-ph/0004149
14 pages, 8 figures
arxiv created 2000/04/16 · openalex publication_date 2000/04/16 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Using the soft pion theorem in the inclusive reactions, we estimate the soft pion contribution to the structure functions F2 and g1 in the nucleon, and show that it is an indispensable part in these structure functions in the small x region. This contribution is asymmetric for the soft π+ and π- due to pole terms in the soft pion limit, hence it is a remnant of the spontaneous chiral symmetry breakings. Then we show that the modified strange sea quark where the soft pion contribution is added to the distribution determined by the ansatz (strange-sea)=(up-sea + down-sea)/4 satisfies the mean charge sum rule for the sea quarks.