[d2n-analysis-talk] cerenkov cuts

[David Flay]

On Fri, Mar 19, 2010 at 12:54 PM, <posik at jlab.org> wrote:

> Hi all,
>
>  So after our meeting yesterday, I decided to look at the cuts that I was
> using. So what I did is used the first ~500k or so events from run 2060
> and applied one by one the cuts that I was using. What I found was that
> using BB.tr.n==1 killed about 95% of the events. I know that we are
> going to be a lot of BB.tr.n!=1 tracks, but 95% seems high. The rest of
> the cuts that I used didn't seem to drastically affect the statistics.
>
> Here is a summary of how the statistics changed with various cuts.
>
> http://www.jlab.org/~posik/d2n/BB/cer/cer_cuts/cer_cut_summary.txt<http://www.jlab.org/%7Eposik/d2n/BB/cer/cer_cuts/cer_cut_summary.txt>
>

run 0 already includes the 1-track cut (BB.tr.n==1)  the n signifies the
number of tracks (compare to L.tr.n => number of tracks).

In which case, I find it odd that 'run 1' gives ~2x the amount of events
after run 0.

Maybe start with the momentum cut + z-vertex reconstruction cut as your
'standard' cut, then tack on the BB.tr.n cut and see what happens?



-- 
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David Flay
Physics Department
Temple University
Philadelphia, PA 19122

office: Barton Hall, BA319
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e-mail: flay at jlab.org
           flay at temple.edu

website: http://www.jlab.org/~flay
             http://quarks.temple.edu
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