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MC pπ0γ - A2 Mainz

MC pπ0γ - A2 Mainz

Basic Analysis

Basic Analysis ConditionsBasic conditions in event selection for γp → pπ 0 γ' reactions:●3 photons in CB/TAPS (accepted, if θ > 8°)●1 proton in CB/TAPS (not accepted if 10° < θ < 20°)●MWPC information (if present) used for proton direction●Accepted tagged photon energy range from 325 to 475 MeV●●●Combine 2 out of 3 γ to π 0 (3 possible combinations)Select combination with lowest deviation from π 0 mass'Interesting' event if●115 MeV < m < 155 MeV●E '> 30 MeV (changed from 40 MeV)●Lots of kinematical cuts (nothing changed)...Sven Schumann Crystal Ball Collaboration Meeting Basel, Oct 05 2006

MC Event Generator (1)Event generator for γp → pπ 0 γ', γp → pπ 0 and γp → pπ 0 π 0 reactions(mkin, deckin, MCGenerator... - another one might be useful...)2 different models for γp → pπ 0 γ' distributions:a) • 3-body-phasespace distribution for pπ 0 γ'• Bremsstrahlung distribution for E tagb) • Distribution according to theoretical 5-fold diff. cross sectiond 5 /dE 'd 'd 0(E tag) (Drechsel/Vanderhaeghen PRC 64(2001))• Assuming azimuthal symmetry for '– No polarisation!• 'Folded' with bremsstrahlung distribution for E tag• Thanks to Martin for his support!☺?? ? ?? ? ?? ? ?(This is a 5-dimensional pictureof the used parameter space...!)Sven Schumann Crystal Ball Collaboration Meeting Basel, Oct 05 2006

DPG Spring Meeting Sven Schumann Bonn, March 18th ... - A2 Mainz
JGU Data and Statistics 2010 - Johannes Gutenberg-Universität Mainz
Richard Codling University of Glasgow Photon ... - A2 Mainz
New development of the AcquRoot for data and MC - A2 Mainz
Delta Magnetic Moment (Lin. Pol. Photons) - A2 Mainz
T and F in  photoproduction in the S (1535) region ... - A2 Mainz
Steering Committee Meeting, Basel, 4 October 2006 - A2 Mainz
The measurement of the η-mass from the reaction γp ... - A2 Mainz
Recoil Neutron Polarisation from the Photodisintegration ... - A2 Mainz
Crystal Ball Geometry and Simulation - A2 Mainz
Helicity dependence of single and double pion ... - A2 Mainz
' Decays Introduction Physics: - ('→2)/(→2 ... - A2 Mainz
CB-TAPS@MAMI: Round Two - Photon Asymmetry in ... - A2 Mainz