https://doi.org/10.1140/epja/i2013-13020-1
Regular Article - Theoretical Physics
Threshold neutral pion photoproduction off the tri-nucleon to O(q4)
1
Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, D-53115, Bonn, Germany
2
Ruhr-Universität Bochum, Institut für Theoretische Physik II, D-44870, Bochum, Germany
3
Forschungszentrum Jülich, Institut für Kernphysik (IKP-3), Institute for Advanced Simulation (IAS-4) and Jülich Center for Hadron Physics, D-52425, Jülich, Germany
Received:
24
September
2012
Revised:
14
December
2012
Accepted:
9
January
2013
Published online:
11
February
2013
We calculate the electromagnetic neutral pion production off tri-nucleon bound states (3H, 3He) at threshold in chiral nuclear effective field theory to fourth order in the standard heavy baryon counting. We show that the fourth-order two-nucleon corrections to the S-wave multipoles at threshold are very small. This implies that a precise measurement of the S-wave cross section for neutral pion production off 3He allows for a stringent test of the chiral perturbation theory prediction for the S-wave electric multipole .
© SIF, Springer-Verlag Berlin Heidelberg, 2013