PES shape variable studies
MC and test beam cluster widths seem to agree, but clusters in Z data
are much wider. Two candidates to explain this effect are:
- More material in the path of the electrons than there was in the
test beam, or than is modeled in the simulation.
- This seems less likely since adding in the bulk of the silicon
passive material, which was off by accident, did not change the
cluster shapes much in the simulation:
- We can test the effect that adding additional material in the
simulation might have by, say, doubling the thickness of the COT
endplate and seeing how that changes the PES cluster shapes and
widths.
- Crosstalk between strips or pixels in the MAPMTs.
- Anecdotally, it
looks like there is crosstalk at the 10% level in some clusters
between the seed strip and the strips +/- 4 away. There is also a
clearly noticeable effect in the plots from Howard below.
- It's not clear, however, if this effect can explain the full
"extra wideness" we see in the data.
- Also, what's the difference between the test beam and the
current detector in this respect? Isn't the relevant hardware the
same?
Some plots from Howard Budd:
Last modified: Thu Mar 14 18:17:23 PST 2002