Relatore
Summary
The combination of the CrystalBall and TAPS electromagnetic calorimeters were
installed in the MAMI A2 hall in 2003. Here they are able to detect the reaction
products from photo-induced reactions in combination with the Glasgow photon
tagger.
In the first round of data taking they allowed a diverse series of experiments such
as the study of eta decays, radiative delta decay, multi-pion photoproduction using a
proton target as well as coherent pion production and medium modifications on
nuclear
targets.
In the last two years the MAMI-B electron beam was upgraded from 880MeV to the
1.5GeV MAMI-C, the A2 photon tagger underwent a similar upgrade. One significant
aspect of this was it crossed the threshold for strangeness photoproduction
experiments. The intense photon beam with excellent energy resolution from the
tagger
now give the A2 collaboration the opportunity to make detailed measurements of
strangeness photoproduction close to threshold. The challenge is to identify K+
mesons above the background from other charged hadrons, where the relative Kaon
cross
section is very small and the detector setup does not benefit from a magnetic field
to help separate particle species. One solution outlined in this presentation is to
identify the decay of the K+ stopped in the either of the calorimeters through
different time signatures in neighbouring crystals and use this to tag a strangeness
reaction.
