Investigation on the Bump in the resolution for higher energies / eta

for energies around 1000 !GeV there is a bump in the resolution for certain eta ranges... (see Fig. 1 a) - no bump and b) - pronounced bump for all calibrations )

Resolution_singeletabins_cscnote_all_J6_eta0_0.7.png Fig. 1a) J6 sample, new calibration for TopoJets, 0.0 < eta < 0.7


Fig. 1b) J6, 1.5 < eta <2.5 here a bump is clearly visible - coming from the crack region?

This effect vanished for a finer binning in eta.... I suspect it comes from the fact, that only ONE Jxx sample was used, where the crack region resolutions dominated the resolution for a specific energy region (due to the fact that the bulk of events is in this kinematic region). See this file for more explanation: EtaBump.ppt

One more remark: It is true that the eta vs. energy plots is done for the J5 sample (unfortunately this plot is not ready for the J6 sample), but the correlation will be the same (apart from a shift along the energy axis). Furthermore, I get similar bumps in slightly different energy/eta regions for the J7 sample at the position, where they would expected, if the bulk events are responsible.

Finer eta binning










-- KristinLohwasser - 25 Jul 2007

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Topic revision: r3 - 2007-07-26 - KristinLohwasser
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