[G12] p pi+ pi- exclusive Cross Section study

[mkunkel at jlab.org]

Mukesh,

Can you please fit a polynomial to your acceptance for all energies and
then send me the result including the plot of the fit. I would like to use
this for my part of the analysis study.

Thanks
MK

> Hello All,
>
> For the plots and information from the study of p pi+ pi- exclusive Cross
> Section Follow the link at:
>
> http://clasweb.jlab.org/rungroups/g12/wiki/index.php/Omega_Cross-Section_Check#Apr_04
>
> or
>
> http://www.jlab.org/~mukesh/Strangeonia/Analysis/yield_study_ppippim.pdf
>
> The error bars are drawn on the plots 2 and 3 but they are almost
> invisible to the eye. The errors calculated were statistical : SQRT(Number
> of exclusive Events) and propogated through the calculations. Errors on
> gflux numbers were ignored (N_Photons >>> N_Events).
>
> Cut for the exclusive events are:
>
> Event with p pi+ pi- Detected &&
> Event Within vertex &&
> TCut pppexc = "abs(mm_sq) <= 0.010 && abs(mm_pz) <= 0.100 && abs(mm_pt) <=
> 0.100";
>
> No other Cuts are employed.
>
> Cross Section is calculated using the Formulae:
>
> Cross Section = N_Events / N_Photons * (2.016 / 2) / (0.0717 * 40 * 6.022
> * 10e+22 * Acceptance);
>
> Cross Section = (Events/Beam Photons) * (Molar Weight of H2 / Number of H
> atoms) / (LH2 Density * Target Length * Avogadros Number * Acceptance)
>
> I would like everyone to confirm that this is the way Cross Section is
> Calculated and all the Numbers in here are Correct. Else I have been
> obviously giving you guys all the wrong numbers.
>
> Mukesh,
> Graduate Student,
> Florida State University.
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