Low energy effective hamiltonian for ΔI = 1 nuclear parity violation and nucleonic strangeness


Journal Article

We calculate the low energy effective hamiltonian for isovector (ΔI = 1) nuclear parity violation, including the effects of heavy quarks s, c and b. At the hadronic scale, the hamiltonian contains four-quark operators of the u, d, and s quarks whose coefficients contain leading logarithmic QCD corrections from running between the weak scale and the hadronic scale. The coefficients of the operators involving the s quark are substantially larger than those of the operators involving only the u and d quarks. Recent EMC measurements of the spin-dependent proton structure functions g 1p (x) and measurements of the low-Q 2 axial nucleon-Z 0 coupling from neutrino scattering indicate that the nucleon matrix element of the strange vector axial current is substantial. Assumming that the weak amplitude factorizes, this matrix element gives rise to an enhancement in the weak isovector parity violating NN ρ{variant} coupling, and consequently an enhancement of h ρ{variant}1 . © 1991.

Full Text

Duke Authors

Cited Authors

  • Dai, J; Savage, MJ; Liu, J; Springer, R

Published In

Volume / Issue

  • 271 / 3-4

Start / End Page

  • 403 - 409

International Standard Serial Number (ISSN)

  • 0370-2693

Digital Object Identifier (DOI)

  • 10.1016/0370-2693(91)90108-3

Citation Source

  • Scopus