Two-pion-exchange parity-violating potential and $\vec{n} p \to d γ$

Details Two-pion-exchange parity-violating potential and $\vec{n} p \to d γ$ Two-pion-exchange parity-violating potential and $\vec{n} p \to d γ$

2006-09-07

arxiv.org/abs/nucl-th/0609015v1

Eur.Phys.J.A32:513-515,2007

Physics

Nuclear Physics

Nuclear Theory

3 pages, contribution to the workshop PAVI06 held in Milos island, Greece, May 16-20, 2006

Scientific paper

10.1140/epja/i2006-10426-8

We calculate the parity-violating nucleon-nucleon potential in heavy-baryon chiral perturbation theory up to the next-to-next-to-leading order. The one-pion exchange comes in the leading order and the next-to-next-to-leading order consists of two-pion-exchange and the two-nucleon contact terms. In order to investigate the effect of the higher order contributions, we calculate the parity-violating asymmetry in $\vec{n} p \to d \gamma$ at the threshold. The one-pion dominates the physical observable and the two-pion contribution is about or less than 10% of the one-pion contribution.

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