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Toy Model for Pion Production in Nucleon-Nucleon Collisions
C. Hanhart, G. A. Miller, F. Myhrer +2
We develop a toy model of pion production in nucleon-nucleon collisions that reproduces some of the features of the chiral Lagrangian calculations. We calculate the production ampl…
Extra dimensions, SN1987a, and nucleon-nucleon scattering data
Christoph Hanhart, Daniel R. Phillips, Sanjay Reddy +1
One of the strongest constraints on the existence of large, compact, "gravity-only" dimensions comes from SN1987a. If the rate of energy loss into these putative extra dimensions i…
Near threshold Lambda and Sigma production in pp collisions
A. M. Gasparian, J. Haidenbauer, C. Hanhart +2
A model calculation for the reactions and near their thresholds is presented. It is argued that the experimentally observed strong suppression of pr…
NN-->NNpi from the effective field theory point of view: short comings and gains
C. Hanhart
Based on a counting scheme for the application of chiral perturbation theory to pion production in NN collisions p-wave production is studied. It is demonstrated that, contrary to…
Chiral Three-Nucleon Forces from p-wave Pion Production
C. Hanhart, U. van Kolck, G. A. Miller
Production of p-wave pions in nucleon-nucleon collisions is studied according to an improved power counting that embodies the constraints of chiral symmetry. Contributions from the…
Polarization phenomena in the reaction NN to NNpi near threshold
C. Hanhart, J. Haidenbauer, O. Krehl +1
First calculations for spin-dependent observables of the reactions , and near threshold are presented, employing the Jülich model for pio…