[d2n-analysis-talk] current d2 DB

[posik at jlab.org]

Hi Diana,

  I finished looking at run 1250 where the missing tracks were, you can
find some plots I made and the description of them here as well as the
cuts I used:

http://jlab.org/~posik/1250/

 To start I replayed(not full replay, too many events) the run with no
cuts and got 685,485 events. I then applied the trigger cuts but instead
of using evtype, I used (DL.evtypebits&(1<<X))==(1<<X) where X is the
trigger you want to cut on. The sh/ps cuts that I used are

BB.ts.ps.e>800&&0.5*BB.ts.ps.e+BB.ts.sh.e>700

 Using just the trigger cuts seemed to only get rid of a few events
(~1000), so I then implemented the sh/ps + trigger cuts and then I see
there are only 412602 events left of these 190299 have one or more
tracks.

I was recently able to get a result from a onepass shower and preshower
calibration. So I then used this calibration to see if there is any
significant change. Again I used the same cuts as in the uncalibrated case
and what I found was that in 685485 events after the ps/sh + trigger cuts
was that there were 173839 events of which 94855 were one track events.
The reason for the less one track events here I think is that the
calibration on the ps/sh tightened up the shower+preshower energy and the
ps energy so that the original cuts are cutting out a good amount of good
electrons.

-Matt

Hi Matt,

Good idea! It's run 1250; it was taken in unified-DAQ mode, so it also
includes some LHRS data.

I'm actually getting the track numbers from a macro I got from Xin (which
is a preliminary stage in doing the optics analysis). The basic gist is
that it's a for loop running over all the entries in the T tree in the
root file. I inserted a line wherein I add up the value of the branch
BB.tr.n for each entry.

Initially I only added up the value of that branch for events satisfying
the cuts

((evtype==1||evtype==2||evtype==5||evtype==6)&&pse>800.&&(pse/2.+she)>700.)

which is where the ntracks=28430 number comes from. When I remove that cut
entirely, I get 38503 tracks.

Diana

On Tue, 27 Oct 2009, MATTHEW R POSIK wrote:

    Hi Diana,

     I was wondering what run it was that you were replaying, I can try it
on
    my comp and see if we get the same results. Also to get the tracks are
you
    just plotting the BB.tr.n and making the cut BB.tr.n>=1?

    -Matt

    On Tue, Oct 27, 2009 at 10:44 AM, Diana Parno
<dseymour at andrew.cmu.edu>wrote:

        Thanks Matt,

        I'll try it directly. It took a little time to get the BB library
straightened out, but the new library doesn't seem to have made
any
        significant difference to the number of tracks.

        Diana


        On Mon, 26 Oct 2009, MATTHEW R POSIK wrote:

         Hi Diana,


             Here is a tar ball of my current d2n DB that I am working
with. Also let
            me know if updating the bigbite lib helps at all.

            Thanks
            Matt