Extraction of the strong neutron-proton mass difference from the charge symmetry breaking in pn-->d pi0

Filin, A.; Baru, V.; Epelbaum, E.; Haidenbauer, J.; Hanhart, C.; Kudryavtsev, A.; Meißner, U. -G.

doi:10.1016/j.physletb.2009.10.069

arXiv 2009-07-27 DOI 10.1016/j.physletb.2009.10.069 0 مشاهدة

Extraction of the strong neutron-proton mass difference from the charge symmetry breaking in pn-->d pi0

Filin, A. · Baru, V. · Epelbaum, E. · Haidenbauer, J. · Hanhart, C. · Kudryavtsev, A. · Meißner, U. -G.

Nuclear Theory High Energy Physics - Phenomenology

الأصل · EN

We perform a complete calculation of charge symmetry breaking effects for the reaction pn -> d pi0 at leading order in chiral perturbation theory. A new leading-order operator is included. From our analysis we extract δmₙstr, the strong contribution to the neutron-proton mass difference. The value obtained, δmₙstr = 1.5 ± 0.8 (exp.) ± 0.5 (th.) MeV, is consistent with the result based on the Cottingham sum rule. This agreement provides a non-trivial test of our current understanding of the chiral structure of QCD.

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