[d2n-analysis-talk] H2 update report

[Brad Sawatzky]

Looks like good progress Matt.  A few comments:

  p. 11:  (copy-paste error)  'BCM scalers' isn't right -- trigger
          scalers maybe?

  p. 14:  You should use the acceptance defined by the cuts you've
          applied to theta, phi, p, etc earlier.  Those will be smaller
          than the "wide open" parameters listed on the Hall A page.

  p. 17: I'm a little puzzled that there are 216k coincidence events in the 
         LHRS, but only 11k protons.  What is cutting out 95% of the
         data?  Are we really 20:1 proton to pi+ in elastic kinematics?

It would be very good to see a missing mass plot that shows the elastic
proton peak.

I can believe the 93% number for electron tracks in BB in these
kinematics.  That's lower than I would have hoped, but it isn't
terrible.

-- Brad

On Fri, 23 Apr 2010, posik at jlab.org wrote:

>   I have just put together a few slides that go over what I have done with
> computing the H2 cross section. You can find the link here:
> 
> https://hallaweb.jlab.org/wiki/index.php/Analysis_resources_for_d2n#23_April_2010_Meeting:
> 
> I put it under April 23 Meeting.
> 
>  Currently I am waiting on the H2 GMA ref cell target density. Once I have
> this I should be able to pull a rough cross section. Also looking at the
> proton tracks that show up in the LHRS, the BB has ~93% coin electron
> tracks, which I don't think is too bad.
> 
> Let me know if you have any questions or suggestions.
> 
> Thanks
> Matt Posik
> 
> 
> 
> 
> 
-- 
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