Darmstadt 2008 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 40: Theorie

HK 40.8: Vortrag

Donnerstag, 13. März 2008, 18:30–18:45, 2F

Parity-violating two-pion exchange nucleon-nucleon interaction — •Norbert Kaiser — Physik Department T39, Technische Universität München

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_π⁻¹ ≃ 1.4 fm they amount to about ± 16% of the parity-violating 1π-exchange potential. We evaluate also the parity-violating effects arising from 2π-exchange with excitation of virtual Δ(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 1π-exchange with the parity-conserving one. The analytical results presented in this work can be easily implemented into calculations of parity-violating nuclear observables.

[1] N. Kaiser, Phys. Rev. C76, 76047001 (2007).