[d2n-analysis-talk] BB Cerenkov TDC cut

[Brad Sawatzky]

On Fri, 12 Mar 2010, MATTHEW R POSIK wrote:

> Yes the red region is defined by my cut bounds. I looked at the 20
> TDCs associated with the PMTs and fit the TDC signal with a Gaussian.
> I then too the width to be 2*sigma for the Gaussian fit. So I have two
> arrays of length 20 corresponding to the TDC peak and sigma for each
> PMT. The difference in the TDC cuts is due to how well the fit fits
> the TDC signal on each PMT.  Some are TDC signals are not as sharp as
> others. Should I fix them to all have the same width about the TDC
> peak?

It should be a single fixed cut on all TDCs for now.

I am 99% sure that the hits on the prominent 'shoulder' to the right of
the peaks are real Cherenkov signals too.  I think we had pretty good
idea of what was going on there and how to make a correction that would
put those hits back in the peak...   Can't remeber the details at the
moment though -- I think it had to do with how the coincidence between
the Shower and Cerenkov was made.  It might save you some time if you
look through the halog during the d2n and transversity period.

-- Brad

-- 
Brad Sawatzky, PhD <brads at jlab.org>  -<>-  Jefferson Lab / Hall C / C111
  Ph: 757-269-5947 -<>- Pager: 757-584-5947 -<>- Fax: 757-269-5235
The most exciting phrase to hear in science, the one that heralds new
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