[Tpe] tracking problems in TPE

[Mac Mestayer]

Rob;

Normally neither HBLA nor TBLA are written out because they
are quite large.  But for this study, write out both.

 			- Mac

"mestayer at jlab.org", (757)-269-7252

On Fri, 29 Jun 2012, Bennett, Robert P. wrote:

> Hi Mac,
>             I just want to double check something.  We already write out TBLA.  Did you mean HBLA?
> Regards,
> Robert
>
> ________________________________________
> From: tpe-bounces at jlab.org [tpe-bounces at jlab.org] On Behalf Of Mac Mestayer [mestayer at jlab.org]
> Sent: Friday, June 29, 2012 2:19 PM
> To: Larry Weinstein
> Cc: tpe; stepan Stepanyan
> Subject: [Tpe] tracking problems in TPE
>
> Hello all;
>
> I've been talking ot Rob and Stepan about the strange changes
> to tracking when one artificially changes the assigned torus
> polarity.  Here are some thoughts on things to look at.
>
> We all agree that more information is needed.  Rob will
> re-cook some data and write out the TBLA bank as well as
> the DC bank and others.  Once that is done, we will be able
> to look at events with ced.  Perhaps these events will
> have nearby accidental groups of hits which might be
> selected instead of the true one.
>
> Some of the problems may just be software bugs; for example,
> bad pointers or perhaps different road files for positive and
> negative tracks instead of for outbending and inbending tracks.
>
> Some of the problems may be due to unreasonably large chi-squared
> cuts (> 100/d.f. ?)
>
> Some of the problems might be due to out-of-time accidental tracks.
> These will have very unusual velocities: perhaps very low beta or
> beta greater than one.  The drift chamber residuals will also show
> a strange pattern with a mean time residual not centered at zero
> but off-center.
>
> By the way, once the TBLA bank is written out the TRKMON program
> can be run on the data and turn the bank into an ntuple which
> can be studied with PAW.
>
>                                - Mac
>
> "mestayer at jlab.org", (757)-269-7252
>
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