期刊
PHYSICAL REVIEW LETTERS
卷 96, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.96.232301
关键词
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We show that chiral symmetry and gauge invariance enforce relations between the short-distance physics that occurs in a number of electroweak and pionic reactions on light nuclei. Within chiral perturbation theory, this is manifested via the appearance of the same axial isovector two-body contact term in pi(-)d -> nn gamma, p-wave pion production in NN collisions, tritium beta decay, pp fusion, nu d scattering, and the hep reaction. Using a Gamow-Teller matrix element obtained from calculations of pp fusion as input, we compute the neutron spectrum obtained in pi(-)d -> nn gamma. With the short-distance physics in this process controlled from pp -> de(+)nu(e), the theoretical uncertainty in the nn scattering length extracted from pi(-)d -> nn gamma is reduced by a factor larger than 3, to less than or similar to 0.05 fm.
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