Parity-violating two-pion exchange nucleon-nucleon interaction

Abstract

We calculate in chiral perturbation theory the parity-violating two-pion exchange nucleon-nucleon potentials at leading one-loop order. At a distance of $r=m_{\pi }^{-1}\simeq 1.4$fm they amount to about $\pm 16$ of the parity-violating $1\pi$-exchange potential. We evaluate also the parity-violating effects arising from $2\pi$-exchange with excitation of virtual $\Delta (1232)$-isobars. These come out to be relatively small in comparison to those from diagrams with only nucleon intermediate states. The reason for this opposite behavior to the parity-conserving case is the blocking of the dominant isoscalar central channel by CP-invariance. Furthermore, we calculate the T-matrix related to the iteration of the parity-violating $1\pi$-exchange with the parity-conserving one. The analytical results presented in this work can be easily implemented into calculations of parity-violating nuclear observables.

7 pages, 3 figures, 1 table, published in: Phys. Rev. C76. 047001 (2007)

Cited by in corpus (1)

• Parity-violating nucleon-nucleon interaction from different approaches