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

[Mukesh Saini]

Hi Mike,

If you look through the file it has all the histograms with the fits I use. It also has a 10 MeV Acceptance Binning for all values of Beam Energies I generated. Just get any of the histos and do GetBinCenter() for the Beam Energy Value and and GetBinContent() for the Acceptance Value.

Use histogram Beam0_MC_Acc for All Bins. Open up the histogram in root like:

> root GRID...C

If you send me the format you would like this acceptance to be in. I can send it to you in a text file too.

Mukesh.

----- Original Message -----
From: mkunkel at jlab.org
Date: Monday, April 4, 2011 5:10 pm
Subject: Re: [G12] p pi+ pi-  exclusive Cross Section study
To: Mukesh Saini <msaini at fsu.edu>
Cc: g12 at jlab.org

> Mukesh,
> 
> Can you please fit a polynomial to your acceptance for all energies 
> andthen 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.
> > _______________________________________________
> > G12 mailing list
> > G12 at jlab.org
> > https://mailman.jlab.org/mailman/listinfo/g12
> >
> 
> 
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> 

Graduate Student,
Florida State University.
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