Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 54: Poster - Hadronenstruktur und -spektroskopie

HK 54.16: Poster

Wednesday, March 6, 2013, 16:45–19:00, HSZ 3.OG

Background estimations for the A4 experiment — •Luigi Capozza — Helmholtz-Institut Mainz, Mainz, Germany

The A4 experiment at the MAMI accelerator facility at Mainz studies the nucleon structure by measuring single spin asymmetries in elastic electron-proton and quasi-elastic electron-deuteron scattering. Elastic and inelastic events are separated by measuring the energy of the scattered particles in an homogeneous PbF₂ electromagnetic calorimeter. Besides inelastic events, gammas from the π⁰ decay constitute another source of background which is particularly important in backward angle measurements. An electron tagger made of plastic scintillating slabs is used at backward angles for suppressing most of this background. In order to correct for the remaining background contributions, MC simulations of the relevant scattering processes and of the detector response are used. Backward results on a hydrogen target have already been published for the beam energy of 315 MeV. There are analyses ongoing on data at other beam energies and both on hydrogen and deuterium targets. Upgrades of the MC for treating these cases will be presented.