Learning about the chiral structure of the proton from the hyperfine splitting

2003/08/19 by Antonio Pineda, A. Morelos Pineda, Pineda, Antonio
Computer Science · Physics and Astronomy · #Atomic Physics (physics.atom-ph) #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-th #physics.atom-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/0308193

3 pages, 2 figures. Contribution to the 17th International IUPAP Conference on Few-body Problems in Physics, June 5-10, 2003 Durham, North Carolina, USA

arxiv created 2003/08/19 · openalex publication_date 2003/08/19 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The complete analytical O(m_l³α⁵/m_p²× (logm_π, logΔ, logm_l)) contribution to the Hyperfine splitting is given. It can explain about 2/3 of the difference between experiment and the pure QED prediction when setting the renormalization scale at the ρ mass. The suppression of the polarizability piece with respect the Zemach one seems to be, to a large extent, a numerical accident. We give an estimate of the matching coefficient of the spin-dependent proton-lepton operator in heavy baryon effective theory.

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