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Possible Issues at Eta=4.0 and Cos(phi)=-1
There has been a question of whether the large AN at small pt for Energy ~ 50 GeV could be related to a possible problem in the detector near eta=4.0
and cos(phi)=-1.
This is the 1 parameter fit for that region 4.1>Eta>3.9 and 40<Energy<60, .04<Mass<.3
I do not see evidence of one region that is making this slope large. Note: the chi2 is 4.5 for 9 DOF.
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