[Clas12_rgb] results of the forward tracking efficiency studies

[Stepan Stepanyan]

Dear all,

Attached are the results of my analysis. As I said at the meeting, slops of track multiplicity as a function of the beam current are close to what we have observed for other data sets with different versions of the tracking code, decreasing by ~05-0.6% per nA.

On the "eff_curr.eps" the closed symbols are current RG-B data with the current trigger. The corresponding open symbols are from run 11372, current RG-B data with spring 2019 trigger. The open crosses are from a set of spring 2019 50 nA runs processed with the same (current) code.

In the "theta_pos_eff.eps" ratio of angular distributions of positive track multiplicity at 50(20) nA over 10 nA is shown.

Finally, fmn.eps shows figure-of-merit for 2-track (+,-) and 3-track (+,+,-) events as a function of the beam current using the efficiency slopes from "eff_curr.eps". As can be seen, for 3-prong events we are OK at 45-50 nA. Note, this is only forward tracking.

Regards, Stepan

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