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

Abstract : 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.
Document type :
Conference papers
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http://hal.in2p3.fr/in2p3-00092537
Contributor : Lpsc Bibliotheque <>
Submitted on : Monday, September 11, 2006 - 1:58:37 PM
Last modification on : Monday, July 20, 2020 - 9:18:28 AM

### Citation

C.H. Hyun, S. Ando, B. Desplanques. Two-pion-exchange parity-violating potential and $\vec{n} p \to d \gamma$. International Workshop : From Parity Violation to Hadronic Structure and more.. Part 3 - PAVI06, May 2006, Milos Island, Greece. pp.513-515, ⟨10.1140/epja/i2006-10426-8⟩. ⟨in2p3-00092537⟩

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