2017-02 7¶

3-140¶

Slight concern about 3-140 Test4 vs Test3 (run 9971 vs run 9968); I note the strong lobe structure. I suspect tracker inefficiency is the cause, rather than beam per se:

1. beam is narrower in x and more upright
2. particles with small x tend to have small py (angular momentum effect)
3. so py is smaller in general; which means that those tracks with low px have lower pt

4-140¶

Momentum is a bit low, but alpha is reasonably small in tku