[d2n-analysis-talk] Fwd: LHRS Scintillator Calibration Study

[David Flay]

On Thu, Mar 4, 2010 at 10:16 AM, Brad Sawatzky <brads at jlab.org> wrote:

> I assume you're referring to the second band in the S1 time average at
> 67ns.  That is usually indicates that you're histogramming two different
>
> trigger types: ie. T3, T4.  Double check that your trigger cut is doing
> what you think it's doing.
>

Yeah -- that's the band I'm talking about... These are the cuts I use:

           //one track from the target
           cut0 = Form("(L.tr.n==1)");
           //trigger cuts
          cut0 += Form("&&(DL.edtpl==0)&&((DL.
evtypebits&(1<<3))==(1<<3))");

I've always used this trigger cut, and I haven't seen any structure that
looked 'odd' until now... For comparison, here's a comparison of run 20263
(p = 1.42 GeV, 5-pass) and run 20207 (p = 1.70 GeV, 5-pass)... strange.
Notice how the band becomes more prominent at higher p.



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

office: Barton Hall, BA319
phone: (215) 204-1331

e-mail: flay at jlab.org
           flay at temple.edu

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