534 research outputs found
Low-Energy Effective Field Theory of Lepton-Proton Bremsstrahlung
We calculate the cross section for the lepton-proton bremsstrahlung process
in effective field theory. This process corresponds
to an undetected background signal for the proposed MUSE experiment at PSI.
MUSE is designed to measure elastic scattering of low-energy electrons and
muons off a proton target in order to extract a precise value for the proton's
r.m.s. radius. We show that the commonly used {\it peaking approximation},
which is used to evaluate the {\it radiative tail} for the elastic cross
section, is not applicable for muon proton scattering at the low-energy MUSE
kinematics. We also correct a misprint in a commonly cited review article.Comment: 16 pages, 7 figure
Resolution of the Proton Spin Problem
A number of lines of investigation into the structure of the nucleon have
converged to the point where we believe that one has a consistent explanation
of the well known proton spin crisis.Comment: 10 pages, 1 figur
- …