Hi all,
the track momentum and the neutral energy spectrum are different between
data and MC. In
http://www.slac.stanford.edu/~daniele/vub/comp1600.ps TRACKS
http://www.slac.stanford.edu/~daniele/vub/comp9900.ps NEUTRALS
this difference is shown.
Taking this difference into account and reweighting the MC (basically
taking the numbers from the ratio plot in the bottom of the ps files) on
data I got:
No reweighting:
BRBR :0.0161+-0.0031
Trk reweighting:
BRBR :0.0162+-0.0030
Neu reweighting:
BRBR :0.0169+-0.0030
Total reweighting:
BRBR :0.0172+-0.0029
The difference for the tracking is within the systematics quoted in the
BAD. The neutral one is larger (5% instead of 2%). We could use the more
conservative 5% for the neutral reconstruction systematics.
Daniele
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