Where did elastic deuteron dissappear?
I would like to know the ratio between the number of elastic deuterons observed in the online analysis and the number of golden deuterons, used in the optical calibration. When applying cuts, number of deuterons
reduces significantly. For this analysis was done using 450k events from run #3151.
Online deuterons can be determined using kinematics cuts on left arm:
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Number of golden deuterons much smaller. Why?
The number of golden deuterons elastics is much smaller. The most restrictive cuts
are coincidence cut, track cut and full-hit-in-dE/E cut. Please see following plots:
Analyzer end-of-analysis statistics: log.pdf
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No cuts:
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Coincidence cuts and target cut :
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Coincidence cuts and target cuts and kinematics cut:
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Coincidence cuts and target cuts and kinematics cut and (BB.tp.trHitIndex>-1):
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Coincidence cuts and target cuts and kinematics cut and (BB.tp.nhit>0 && BB.tr.n>0):
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Coincidence cuts and target cuts and kinematics cut and ((BB.tp.nhit>0 || BB.tp.nparthit>0) && BB.tr.n>0):
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Cuts on T3 better than dE cuts:
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Various TDC problems:
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Last modified: 01/12/11
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