20200831 sdobbs PID notes
From GlueXWiki
Here are some suggestions / thoughts from the current studies
- Mahmoud
- FCAL photon delta T resolution in data and MC is close, could be tuned a little more
- tail to negative delta T in data not modeled in MC. would be interesting to understand this more
- possible change to default cuts - increase to +- 2.0 ns. looks like this should be fine for all-neutral final states. maybe not for those with charged particles?
- BCAL photon delta T has shower energy dependence not modeled in MC - cuts are really loose, so this doesn't matter (yet)
- missing mass resolution slightly different in data and MC. due to photon energy or proton momentum resolution (previous studies suggest the latter is the problem)
- FCAL photon delta T resolution in data and MC is close, could be tuned a little more
- Colin
- 1% differences in pi+ BCAL delta t, pi- TOF delta t - driven by low momentum particles?
- 4% difference in proton TOF delta t - at low momentum, a delta T cut of +-0.6 ns is clearly too tight, maybe +-1.0, 1.5 ns at the lowest bin?
- maybe mostly affects baryon analyses?
- Need more 1D slice plots
- Foda
- 1% differences in pi+/pi- TOF delta t - also low momentum?
- Need more 1D slice plots
- Peter
- 3% difference in K+ TOF delta t - maybe this is good for a +-0.3 ns cut? maybe small changes in mean and tails needed? loosen to +-0.35 ns?
- 3% difference in K- BCAL delta t - clear difference in negative side tails - low momentum charged particle calorimeter showers are hard to simulate
- 2% difference in missing mass cut, see above
- Nilanga
- 2% difference in K+ TOF and BCAL delta t
- George
- Everything is consistent within 1%, nice!
- Will need to check missing mass cut