Speaker
Paolo Pedroni
(INFN-Pavia)
Description
Pion photoproduction and Compton scattering are powerful tools
to precisely determine the nucleon structure, thus providing
very stringent tests for all non-perturbative QCD models.
The different observables accessible using polarized photon
beams and/or polarized nucleon targets play an essential role
in this experimental research due to their enhanced sensitivity both to
the individual resonances and to the deformation of the nucleon ground
state caused by an incoming photon.
Despite of this, data on polarized observables
are scarce in many channels, especially in those involving a
neutron target.
A systematic measurement of these observables is being carried
out by the A2@MAMI collaboration at the tagged
photon facility of the MAMI-Mainz accelerator and for energies
ranging from the pion production threshold up to 1.6 GeV.
The large acceptance Crystal Ball/TAPS detection set-up is used for
this purpose.
The present talk will give an overview of the wide
range of polarized observables measured so far on different reactions
together with a perspective on future experiments.
Primary author
Paolo Pedroni
(INFN-Pavia)
