1. 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 2

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 3

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 4

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

6. Mario Plots 6

7. 7 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? 8 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? 9 Red histogram requires <4 hits in the time range -120,-101 (exp3)

10. Comparison with MC (exp3) Nhits still off by ~5 hits 10 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? 11