[G12] Lambda Total Cross Section update.

[Johann Goetz]

MK,
Do you know how often you see two of the tracks in the same sector for p pi+
pi- in the data?

This ratio to total number of events seen is very interesting with p K+ pi-.
I get 20% of the data events to have the p pi- in the same sector, but its
84% in simulations without modelling the trigger which required three tracks
in separate sectors below 3.6 GeV beam energy.

I'm going to develop a small function that takes in all the tracks in the
event and returns true or false based on the trigger logic. Unfortunately,
we had something like 6 or more different trigger configurations so its not
trivial. But I can make it run dependent I suppose.
--Johann

On Fri, Aug 19, 2011 at 9:50 PM, Michael C. Kunkel <mkunkel at jlab.org> wrote:

>  On 8/19/11 7:07 PM, Dennis Weygand wrote:
>
> How does the new gflux do on other cross sections? Did it change by an
> order of magnitude- isn't that the factor we were off?
> Can someone comment on this?
> Dennis
>  On Aug 19, 2011, at 4:29 PM, Johann Goetz wrote:
>
> Hi g12,
> I couldn't get this done before the last meeting, but I did a rough total
> cross section measurement using the most recent gflux data and everything
> looks pretty good so far. There are a few issues I still need to address,
> but after certain corrections (the trigger for example) I believe we will
> have good agreement with older results from CLAS/g1 and SAPHIR.
>
> Here is a link to the plots on the g12 wiki<http://clasweb.jlab.org/rungroups/g12/wiki/index.php/G12_Xi_Paper_-_Lambda_Cross_Sections>
>
> I used 93 complete runs that were evenly distributed throughout g12 - all
> production runs (no single sector runs).
>
> Please mull this over and get back to me with questions on Monday and I can
> investigate further before the next meeting.
> Have a good weekend everyone!
> --
> Johann T. Goetz, PhD.
> jgoetz at ucla.edu
> Nefkens Group, UCLA Dept. of Physics & Astronomy
> Hall-B, Jefferson Lab, Newport News, VA
> Office: 757-269-5465 (CEBAF Center F-335)
> Mobile: 757-768-9999
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>
>   --
> Dennis Weygand
> weygand at jlab.org
> (757) 269-5926 (office)
> (757) 870-4844 (cell)
>
>
>
>
>
>
> _______________________________________________
> G12 mailing listG12 at jlab.orghttps://mailman.jlab.org/mailman/listinfo/g12
>
>  I am attempting to verify this with P Rho (PipPim) cross section. Having
> issues with simulation, hopefully will have result by next meeting.
>
> MK
>
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