[d2n-analysis-talk] BB nofield sieve/vertex

[MATTHEW R POSIK]

Hi Brad,

  I think that the prshower location that was wrong was because it was
copied from an old .dat file.

  The other positions are consistent with the transversity locations.

-Matt

On Fri, Jul 23, 2010 at 5:41 PM, Brad Sawatzky <brads at jlab.org> wrote:

> On Fri, 16 Jul 2010, posik at jlab.org wrote:
>
> >   I have started working on the optics. Here I show the results for a no
> > field run that we took, run 1250.
> >
> >   The no field run is done in order to define the position of the wire
> > chamber through data. Here I compare my results to the results that
> > Diana/Xin have found. The d2n_mp_xxxx are the plots that I made and the
> > d2n_xxxx are the comparison plots that were done by Diana/Xin (not sure
> > who made them). They seem to agree rather well with each other.
>
> That is good to see.
>
> Back in mid-June you made a change to the preshower location in the
> Database files and it made a big difference in the track reconstruction,
> cluster identification, etc.
>
> Did you ever figure out why the preshow location was wrong?  Are the
> other detector component positions verified?  (Or at least compared to
> the Transversity data.)
>
> -- Brad
>
> --
> Brad Sawatzky, PhD <brads at jlab.org>  -<>-  Jefferson Lab / Hall C / C111
> Ph: 757-269-5947  -<>-  Fax: 757-269-5235  -<>- Pager: brads-page at jlab.org
> The most exciting phrase to hear in science, the one that heralds new
>  discoveries, is not "Eureka!" but "That's funny..."   -- Isaac Asimov
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-- 
Matthew Posik
Email: posik at temple.edu
Temple University Physics Dept.
Office: BA-319
Office #:  215-204-1331
WebSites:
Temple:
http://quarks.temple.edu/
d2n:
http://hallaweb.jlab.org/experiment/E06-014/
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