Eur. Phys. J. A (2013) 49: 117
https://doi.org/10.1140/epja/i2013-13117-5

Regular Article - Theoretical Physics

Parity-violating photon circular polarization in nd ³H with effective field theory at thermal energy

Department of Physics, University of Tehran, P.O.Box 14395-547, Tehran, Iran

^* e-mail: m.moeini.a@khayam.ut.ac.ir

Received: 22 April 2013
Revised: 13 August 2013
Accepted: 22 August 2013
Published online: 19 September 2013

Abstract

We study the parity-violating effects in nd ³H process using pionless effective field theory (EFT( /) at thermal energy. For the weak NN interaction the parity-violating Lagrangian contains five independent low-energy coupling constants (LECs). One can fix the coupling constants by comparison of the calculated observables with a sufficient number of experimental data. So, we need five observables to obtain LECs. One of the five parity-violating observables is the photon circular polarization ( in nd ³H process. We calculate at the leading order in terms of LECs. We compare our results with the previous calculation based on the model of Desplanques, Donoghue and Holstein.