[Halld-tagger] is_fiducial cut in TPOL analysis

[Richard Jones]

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From: Richard Jones <rjones30 at gmail.com>
To: Sebastian Cole <scole3 at asu.edu>, Michael Dugger <dugger at jlab.org>
Cc: Hall D beam working group <halld-tagger at jlab.org>
Bcc:
Date: Tue, 3 Apr 2018 09:58:18 -0400
Subject: is_fiducial cut in TPOL analysis?
Hello Michael and Sebastian,

A question has come up in discussions here in the counting house, that I
thought I would raise with you and Michael. In the physics analyses, the
standard practice is to exclude events just before and after beam trips
because the properties of the beam can be problematic during those periods.
To help with this in JANA, there is a standard object named DBeamCurrent
that has a method called is_fidiucial() which returns a true/false value.

Are you using this condition to gate the events you analyze for the TPOL
analysis? In order for the polarizations you produce to be directly
applicable to physics analyses, both need to select the events under the
same beam conditions.

-Richard Jones
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