Eur. Phys. J. A (2013) 49: 149
https://doi.org/10.1140/epja/i2013-13149-9

Regular Article - Theoretical Physics

Parity violation in proton-proton scattering from chiral effective field theory

¹ Institute for Advanced Simulation, Institut für Kernphysik, and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425, Jülich, Germany
² Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, D-53115, Bonn, Germany
³ Institut für Theoretische Physik II, Ruhr-Universität Bochum, 44780, Bochum, Germany
⁴ Physik Department T39, Technische Universität München, D-85747, Garching, Germany

^* e-mail: j.de.vries@fz-juelich.de

Received: 19 September 2013
Accepted: 13 November 2013
Published online: 28 November 2013

Abstract

We present a calculation of the parity-violating longitudinal asymmetry in proton-proton scattering. The calculation is performed in the framework of chiral effective field theory which is applied systematically to both the parity-conserving and parity-violating interactions. The asymmetry is calculated up to next-to-leading order in the parity-odd nucleon-nucleon potential. At this order the asymmetry depends on two parity-violating low-energy constants: the weak pion-nucleon coupling constant and one four-nucleon contact coupling. By comparison with the existing data, we obtain a rather large range for . This range is consistent with theoretical estimations and experimental limits, but more data are needed to pin down a better constrained value. We conclude that an additional measurement of the asymmetry around 125MeV lab energy would be beneficial to achieve this goal.