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LEPS IRS3B analysis Summary

LEPS IRS3B analysis Summary. Jeter Hall. PNNL. PNNL Ntuple Status. 20131011 is the latest production tag Includes: LEPS tree (copied from UH ntuples ) Matching verified for >99% of events in exp 2 and 3, 100% of exp4 Many new variable s Several bugs fixed in CAMAC parsing

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LEPS IRS3B analysis Summary

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  1. LEPS IRS3B analysis Summary Jeter Hall PNNL

  2. PNNL Ntuple Status • 20131011 is the latest production tag • Includes: • LEPS tree (copied from UH ntuples) • Matching verified for >99% of events in exp 2 and 3, 100% of exp4 • Many new variables • Several bugs fixed in CAMAC parsing • Documentation available: • https://belle2.cc.kek.jp/~twiki/bin/viewauth/Detector/TOP/TopcafTreeDefs • Documentation for the LEPS variables also now available: • https://belle2.cc.kek.jp/~twiki/bin/viewauth/Detector/TOP/BeamTestJune2013ROOTDataFormats

  3. ntof • 14.7% of events have ntof==1 • The timing counter is known to cause significant showering • See https://www.phys.hawaii.edu/elog/iTOP+Cosmic+Ray+Telescope/130909_200207/ntof.pdf

  4. tofid? • tofid is usually 23, ntof==1 cut does cut down on outliers • Red histogram is with ntof==1, right histograms are scaled to have equal heights in the tofid==23 peak

  5. ntof • ntof cut does not change the nhit distribution significantly • Red histogram has the ntof==1 cut, as well as requiring tofid==23

  6. Mario Plots

  7. Mario Plots Interesting

  8. Cut on early hits? • For exp3 and exp4, we don’t expect many hits with times similar to normal incidence (before -101 ns in our photon_time variable) • Interesting nhit correlations between the hits between -120,-101 for exp3, and exp4 • Is this correlated with anything in the LEPS data? nhit_early is the hits count in the time range -120,-101 (exp3)

  9. Cut on early hits? • For exp3 and exp4, we don’t expect many hits with times similar to normal incidence (before -101 ns in our photon_time variable) • Interesting nhit correlations between the hits between -120,-101 for exp3, and exp4 • Is this correlated with anything in the LEPS data? Red histogram requires <4 hits in the time range -120,-101 (exp3)

  10. Comparison with MC (exp3) • Nhits still off by ~5 hits Red histogram requires <4 hits in the time range -120,-101 mean = 19.4 hits maxbin = 15 hits Blue histogram is MC v1.1 mean = 11.3 hits maxbin = 10 hits (exp3)

  11. Comparison with MC (exp2) • Comparing the time evolution of light. (Using MC v1.2) • More attenuation/diffusion?

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