[G12] (no subject)

[Johann Goetz]

The eqn: A = R / G (acceptance = reconstructed / generated) is done for each
energy bin seen in the plots. The events simulated was exactly:
   gamma p --> Xi- K+ K+
and the Xi- was allowed to decay according to geant. So the events were
exclusively Xi- signal events. We did not put any effort into reproducing
the background shape which is extremely complicated and may not be quite
possible yet (it would appear that the background in Fig. 3.37 consists
mostly of real physics events and not just pion misidentification, though
its unclear what these events really are)

The simulated flux actually followed the shape of the excitation function of
the Xi- quite well though it hardly matters since I did not do any angular
distribution analyses for instance. This might be done after i give my
defense to get the differential cross section, but then we'll need a better
event generator than the one I used.

I hope that answered your questions, and thank you for taking the time to
look at my thesis!

On Thu, Oct 7, 2010 at 2:02 PM, <mher at jlab.org> wrote:

>
> Dear Johann,
>
> Very nice and detail work! It was useful to read.
>
> I have few questions about Eq 4.5 in section 4.1.2 Acceptance.
> Probably it is very naive, for me is not clear how you have done it:
>
> you selected exclusive events from MM(K+K+) and then for exact that region
> divided MC Reconstructed to generated?
>
> it was done for given photon energy bin only ?
> or you have another bin/cut also ?
>
> Thank you in advance,
> best regards,
> Mher
>
> p.s. I am in g12 list, but I am not working on g12 so, even if i will make
> some comments fill free to ignore.
>
> >> > here is the updated version:
> >> > http://www.jlab.org/~goetz/thesis_draft5.7.pdf<
> http://www.jlab.org/%7Egoetz/thesis_draft5.7.pdf>
> >> >
> >> > what are you opinions on this? Thank you,
> >> > Johann.
>
>
>


-- 
Johann Goetz
jgoetz at ucla.edu
UCLA Dept. Physics & Astronomy
Nefkens Group
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