Difference between revisions of "B1pi tests Sep. 2011"
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[[Image:b1pi_standardgeom_XMass.gif|400px]] [[Image:b1pi_nobcalreadoutgeom_XMass.gif|400px]] | [[Image:b1pi_standardgeom_XMass.gif|400px]] [[Image:b1pi_nobcalreadoutgeom_XMass.gif|400px]] | ||
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| + | To investigate the effect of the BCAL readout we look next at the distributions of photons and charged tracks as a function of angles as well as 2-dim. distributions of energy vs. angle for the different particle tracks.<br> | ||
Revision as of 10:02, 2 September 2011
In the following the GlueX Monte Carlo and and analysis code revision 8233 as of end of August 2011 is used. 50000 b1pi events are generated for two geometries. One is the current standard geometry with a model of the BCAL readout including a copper cooling plate. A second geometry is identical with the exception that the BCAL readout part has been removed. This was done to see the impact of the BCAL readout on the reconstruction of these events. The event vertex is randomly distributed within the 30cm long target along the z-axis.
As one can see there is no obvious difference in the reconstructed mass distributions for pi0, omega, rho, b1 and X regarding the presence of the BCAL readout in the geometry of the simulation.
The pi0 mass (left=standard geometry, right=no Bcal readout):
Here and in the following the black histograms are the thrown Monte Carlo values however the photon energies and charged particle momenta are smeared before the masses are reconstructed.
The omega mass (left=standard geometry, right=no Bcal readout):
The b1 mass (left=standard geometry, right=no Bcal readout):
The X mass (left=standard geometry, right=no Bcal readout):
To investigate the effect of the BCAL readout we look next at the distributions of photons and charged tracks as a function of angles as well as 2-dim. distributions of energy vs. angle for the different particle tracks.
