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Hello Norman,
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<div class="">We’ve been discussing the differences in these two plots which should in principle be similar. Some things I notice here:</div>
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<div class="">1) For tracks on the electron side (phi0 < ~0.045), they appear very similar.</div>
<div class="">2) For tracks on the positron side, you have a “bifurcation”. However, the momentum width of each peak is unphysically narrow: better than the ideal resolution of the tracker.</div>
<div class="">3 The two “peaks” on the positron side appear to lie on the same p vs. phi0 trend line (these are correlated by construction).</div>
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<div class="">Together, (2) and (3) suggest that these are not actually two peaks, but rather that - for some reason - you are not reconstructing many of the tracks on the positron side, and that is actually shaping the distributions there. This is further
supported by the appearance of a hard cutoff in statistics on the line at ~0.045 which does not appear in Cameron’s plot.</div>
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<div class="">So, I wonder if there could be some cut (chisq?) that is causing you not to plot a large number of the slot side tracks. Things to try:</div>
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<div class="">- Make this plot for the same run that Cam is using (to be sure not something real in the detector)</div>
<div class="">- Compare N(phi0 < 0.045)/N(phi0 > 0.045) with Cameron to see if it does seem like you are reconstructing fewer tracks on that side.</div>
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<div class="">Best,</div>
<div class="">Tim</div>
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