Low-energy theorems for nucleon-nucleon scattering

Aug, 1998
10 pages
Published in:
  • Phys.Rev.C 59 (1999) 13-20
e-Print:
Report number:
  • DOE-ER-40762-156,
  • UMD-99-011

Citations per year

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Abstract:
Low energy theorems are derived for the coefficients of the effective range expansion in s-wave nucleon-nucleon scattering valid to leading order in an expansion in which both mπm_\pi and 1/a1/a (where aa is the scattering length) are treated as small mass scales. Comparisons with phase shift data, however, reveal a pattern of gross violations of the theorems for all coefficients in both the 1S0^1S_0 and 3S1^3S_1 channels. Analogous theorems are developed for the energy dependence ϵ\epsilon parameter which describes 3S13D1^3S_1 - ^3D_1 mixing. These theorems are also violated. These failures strongly suggest that the physical value of mπm_\pi is too large for the chiral expansion to be valid in this context. Comparisons of mπm_\pi with phenomenological scales known to arise in the two-nucleon problem support this conjecture.
  • nucleon nucleon: elastic scattering
  • partial wave analysis
  • approximation: effective range
  • low-energy theorem
  • expansion
  • pi: mass
  • nucleon nucleon: scattering length
  • numerical calculations: interpretation of experiments