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

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

2009-07-27

arxiv.org/abs/0907.4671v2

Phys.Lett.B681:423-427,2009

Physics

Nuclear Physics

Nuclear Theory

11 pages, 2 figures, revised version accepted by PLB

Scientific paper

10.1016/j.physletb.2009.10.069

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 \delta m_N^{str}, the strong contribution to the neutron-proton mass difference. The value obtained, \delta m_N^{str} = 1.5 \pm 0.8 (exp.) \pm 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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