Hello,<br><br>I would suggest to have 2 or 3 dE/dx in order to test different methods. Also a p0 can be usefull with the raw momentum for cross check.<br><br>Best,<br><br><div class="gmail_quote">On Fri, Jul 27, 2012 at 7:44 AM, Nathan Baltzell <<a href="mailto:baltzell@anl.gov">baltzell@anl.gov</a>> wrote:<br>
<blockquote class="gmail_quote">Hi EG6ers,<br>
<br>
I'm preparing the reconstructed bank for RTPC as discussed in our<br>
meetings and here's my thoughts. Currently I have just minimal<br>
information for each track:<br>
<br>
id1,id2,id3 - 3 hypotheses' pids<br>
p1,p2,p3 - 3 hypotheses' corrected vertex momenta<br>
poverq,dedx,theta,phi - drift momentum, dE/dX, and vertex angles<br>
vx,vy,vz - vertex position<br>
<br>
The selection of these good tracks is based upon cuts, but using the<br>
the cuts I use to get good calibration tracks may be overly tight:<br>
<br>
npads > 3<br>
fabs(sdist) < 5<br>
edist > -2 && edist < 5<br>
fabs(doca) < 0.002<br>
chi2 > 0.3 && chi2 < 3<br>
fabs(zvertex) < 100<br>
<br>
Loosening them and including those additional variables in the bank<br>
may be good:<br>
<br>
chi2 - of the helix fit<br>
doca - DOCA of the helix to the beamline<br>
sdist - path length from the first hit to the start of the drift region<br>
edist - path length from the last hit to the end of the drift region<br>
npads - number of hit pads<br>
<br>
<br>
-Nathan<br>
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</blockquote></div><br><br clear="all"><br>-- <br>Raphaël Dupré<br>