Neutral pion photoproduction on deuterium in baryon chiral perturbation theory to order q4

Neutral pion photoproduction on nuclei in baryon chiral perturbation theory.

Near threshold neutral pion electroproduction on deuterium in chiral perturbation theory

Near threshold neutral pion electroproduction on the deuteron is studied in the framework of baryon chiral perturbation theory at next–to–leading order in the chiral expansion. We develop the multipole decomposition for pion production off spin-1 particles appropriate for the threshold region. The existing data at photon virtuality k = −0.1GeV can be described satisfactorily. Furthermore, the p...

Unitarized pion-nucleon scattering within Heavy Baryon Chiral Perturbation Theory

By means of the Inverse Amplitude Method we unitarize the elastic pion-nucleon scattering amplitudes obtained from Heavy Baryon Chiral Perturbation Theory to O(q3). Within this approach we can enlarge their applicability range and generate the ∆(1232) resonance. We can find a reasonable description of the pion nucleon phase shifts with O(q2) parameters in agreement with the resonance saturation...

Baryon chiral perturbation theory

We provide an introduction to the power-counting issue in baryon chiral perturbation theory and discuss some recent developments in the manifestly Lorentz-invariant formulation of the one-nucleon sector. As explicit applications we consider the chiral expansion of the nucleon mass, its convergence properties, and calculations of the electromagnetic and axial form factors of the nucleon.

Coherent Pion Photoproduction on Deuterium

Differential cross sections of the γd → dπ 0 reaction were measured at photon beam energies between 0.5 and 2.0 GeV over a wide angular range in the CM system. The experiment was performed in Hall B at Jefferson Lab using the CLAS detector. The excitation function, especially at backward CM scattering angles, has been studied with regard to effects due to intermediate on-shell η and ω rescatter...