Re: updated talk for PID

[Eugene Chudakov <gen@jlab.org>]

Hall D PID Mail List:

Matt,

thanks for sending me your talk on the event fitting.
For my current studies I (in fact) did not use any fitting. I just
selected particle combinations, balancing the initial and final 3-momentum and
the energy. Again, it was very simple: I selected the same absolute cuts
in GeV for all events, without calculating the individual covariances for each event.
Therefore, there must be a room for improvement.
I am sure you have already perfected this method.

If I did any new step with this study, it is considering the minimum bias
background from PYTHIA.
The pion suppression is only a factor of 0.4-0.6 for a kaon candidate,
the overall suppression is about 0.2. The proton PID gives another factor of 4.
Indeed, a factor of 3 comes from combinatorics, while some events may have
no proton as well.

Eugene

------------------------------------------------------
Eugene Chudakov
http://www.jlab.org/~gen
phone (757) 269 6959  fax (757) 269 5703
Thomas Jefferson National Accelerator Facility
12000 Jefferson Ave, Newport News, VA 23606 USA

On Wed, 19 Mar 2008, Matt wrote:

> Hi Eugene,
>
>    The kinematic fit mentioned in your talk, is that the fitter that I
> checked into the repository under $HALLD_HOME/src/libraries/PID? Or a
> different one? I see you're doing a different study than what I did, but I
> found that using time-of-flight info from the BCAL and forward TOF got you
> quite far in trying to do kaon physics, though I had a simpler physics
> background than the full pythia spectrum.
>
> Matt
>
>
> On Wed, Mar 19, 2008 at 3:54 PM, Eugene Chudakov gen <gen@jlab.org> wrote:
>
> > Hall D PID Mail List:
> >
> >
> > I updated the slides, including new pictures and adding more info.
> >
> > It can be found at:
> > http://www.jlab.org/~gen/gluex/talk_pid_rev.pdf<http://www.jlab.org/%7Egen/gluex/talk_pid_rev.pdf>
> >
> > The talk source is located at
> > jlabl1:/home/gen/tex/GLUEX/talk_pid_march_2008.tex
> > The pictures are stored at
> > jlabl1:/home/gen/tex/GLUEX/pictures/plot_glx_*.pdf
> > For each picture there are also .epsi and .ps files.
> >
> > Eugene
> >
> > ----------------------------
> > Eugene Chudakov
> > JLab
> >
> >
>
>
> --
> --
> ----------------------------
> Matt Bellis
> Carnegie Mellon University
> (office) 412-268-6949
> (cell) 412-310-4586
> ----------------------------
>