[G12] Lambda Total Cross Section update.

[Johann Goetz]

MK,
OK, If I read your plots right, then 17.3 % of the time, you have at least
two of the three tracks in the same sector for p pi- pi+ exclusive events in
the data. This *should* be the same for simulations if we model the trigger
logic correctly (which we don't at the moment).

On Sat, Aug 20, 2011 at 2:06 PM, <mkunkel at jlab.org> wrote:

> Johann,
>
> This question I do not have an answer for your question. I do however know
> the answer if you require all 3 to be in same sector, maybe something can
> be extrapolated from these.
> http://clasweb.jlab.org/rungroups/g12/wiki/index.php/Yield_Calculation
> date Wednesday, April 19th 2011.
>
> I can write a simple program to calculate this if you give me till
> Tuesday. I have limited internet access right now.
>
> MK
>
> > 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
> >> _______________________________________________
> >> G12 mailing list
> >> G12 at jlab.org
> >> https://mailman.jlab.org/mailman/listinfo/g12
> >>
> >>
> >>   --
> >> 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
> >>
> > _______________________________________________
> > G12 mailing list
> > G12 at jlab.org
> > https://mailman.jlab.org/mailman/listinfo/g12
> >
>
>
>


-- 
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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