Minutes
RC:
RC: Presenting sampling fractions.
Single photons, 1-10 GeV, uniform in angle. Required conversion in first 1/2 of EM. Angle cuts in barrel, 45 deg, and endcap, away from edge. (don't remember exactly) Fit for sampling fraction.
Plotting total E in EMCal vs. Generated Energy.
Errors w/ estimate of sampling fraction. Iterate. Do a straight line fit.
Using sid00 detector.
Can do a fit. Not a bad chi-squared, assuming 20%/sqrt(E).
Repeat for endcaps w/ same procedure for 2 other EMCal calorimeters.
In cdcaug05 and sid00, compute sampling fraction doubling the energy from the last 10 layers.
RF: Standard cutoff?
RC: slic-generated with "standard" settings. Effective cutoff parameter is large.
RF: This is why 20% instead of 15%?
RC: Yes.
For sidaug05, cdcaug05, check against ZZ data. Plot the residuals.
Go through data and pick out photons. Pick out residuals. Fit with a Guassian. Mean close to 0. Sigma close to 1. Same thing for endcap. Not perfect, but close.
See slides for results.
Propose to put in as sampling fractions.
WL: Error?
RC: Error on the fit is small, in 4th or 5th decimal place.
Averages over a lot of stuff.
Should use same technique to obtain the number for all detectors.
MR: What does "corrected" mean?
RC: "Corrected" means that last 10 layers get weight x2.
Any objections get to me before tomorrow, will consider, but plan to put the numbers in for now.
RF: Did x2 with EGCS, and seemed to be the best.
RC: Seemed best to me.
MR: Working on reco cheater. Noticed that some quarks are getting through.
RC: Some generators do this – leave quarks hanging.
MR: Crashing the jet finder. Some particles have less energy than their mass – neutrons, klongs. For now, just ignore the particle.
RC: Covert cluster to energy. Maybe neutron < 1 GeV.
JS: Check so that doesn't happen?
TJ: What to do when it does happen?
RC: Suggest at least putting the particle in with some E.
MR: Not sure if MCParticles or Clusters.
TJ: Should not happen with MCParticles. In real found clusters, should add the energy if postulating that it is a neutron.
RC: If don't know the particle, then end up using the total energy as primary variable. Arguing to use kE a while ago.
TJ: Responsibility of person doing the combining.
RC: One number and count the hits. Multiply the hits by some energy = total energy.
TJ: Whoever is making the 4-vectors should check that the E and mass are correct/reasonable.
MR: Added two new detectors into LCDetectors – hd3.1 and ld3.1. Next generation large detector.
TJ: Supposed to be close to GLD/LDC?
MR: First approximation. Also put up some pictures generated by TopDrawer.