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

[Brad Sawatzky]

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