current simulation is inadequate and needs work; discrepancies in CTBCORE probably associated to this (extend of excess unclear but probably large), historical issue with CalTransRms from BT data associated to that
simulation requires implementation of this effect; discussion about implementation, i) adding finer McIntegratingHits closer to xtal edge ii) holding info from every single particle simulated in the shower (computationally unacceptable?) iii) implement average behaviour from data asimmetry (NB each xtal has a specific asimmetry curve that requires calibration)
Path forward: modify McIntegratingHit to include effect of direct light and Brewster angle effect at Xtal ends. Modify Xtal response to incorporate new information available from McIntegratingHit. Observe effects using modified CalValsTool that includes Xtal end-to-end light asymetries. Presently being implemented by Tracy.
handling longitudinal position in data
Bill proposes resolving ambiguity by looking at adjacent layers up/below
Philippe says this can be done when reconstructing shower profiles
Luca B propose empirical method to re-align xtals too far away from shower main axis for EM showers - what happens with MIPs?
Energy scale and BT analysis
historical discrepancy from BT: implications for the LAT not unanimously accepted, existing reservations on different calibrations and environments between data and MC
Grove prefers measurement from CRE cutoff wrt BT as it comes from the LAT and is not affected by rate/T effects
agreement to use BT data to study edge effects with EM showers