Two parity-violating asymmetries from in pionless effective field theories

Abstract

We consider parity-violating observables from the processes np → dγ and np → d γ. We perform calculations using pionless effective field theory both with and without explicit dibaryon fields. After combining these results with ones we have already obtained on parity-violating asymmetries in N N scattering, experimental input would in principle allow the extraction of all five parameters occurring at leading order in the parity-violating Lagrangian.

He3andpdscattering to next-to-leading order in pionless effective field theory

“…It has also been used to study N N parity-violation [20][21][22][23] and neutrino-deuteron processes [24][25][26][27].…”

Hadronic parity violation in effective field theory

“…Measurement of the PV angular asymmetry A γ in the radiative capture of polarized neutrons on protons ( np → dγ) has been a longstanding goal; the NPDGamma collaboration at the SNS has finished data taking, with results eagerly awaited to be announced (see the contribution by L. Barrón Palos). The LO EFT(/ π) result is [26,21] …”

Hadronic Parity Violation in Few-Nucleon Systems

“…EPJ Web of Conferences two-nucleon interactions contains five independent terms and, in the formalism including auxiliary dibaryon fields for S-wave NN states, is given by [9] …”

“…The angular asymmetry A in polarized neutron capture, np → d , is currently being measured at the Spallation Neutron Source at Oak Ridge National Laboratory [15]. The LO EFT( /) result is given by [9,16] …”

“…Complementary information on the PV couplings can be obtained from the circular photon polarization in unpolarized neutron capture, np → d , which in EFT( /) is given by [9] …”