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

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

2003-08-19

arxiv.org/abs/hep-ph/0308193v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

The complete analytical $O(m_l^3\alpha^5/m_p^2\times (\log{m_\pi}, \log{\Delta}, \log{m_l}))$ 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 $\rho$ 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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