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

[Mukesh Saini]

Hi Mike,

It is a root macro. You need to download it and save it somewhere. Then when you type on your terminal in that directory,

> root GRID_BEAM_BINS.C

It will open the root histogram. You can also open the macro in gedit or any text editor you use to see the content. I double checked the attachment file. It is a root macro and you should be able to this.

I can send you the polynomial fitted Acceptance tomorrow.

Mukesh.




----- Original Message -----
From: mkunkel at jlab.org
Date: Monday, April 4, 2011 7:59 pm
Subject: Re: [G12] p pi+ pi-  exclusive Cross Section study
To: Mukesh Saini <msaini at fsu.edu>
Cc: g12 at jlab.org

> Mukesh,
> 
> There is only a PDF file, no root files. Can you just fit a 
> polynomial for
> all the acceptance.
> 
> MK
> 
> > 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
> >> >
> >>
> >>
> >> _______________________________________________
> >> G12 mailing list
> >> G12 at jlab.org
> >> https://mailman.jlab.org/mailman/listinfo/g12
> >>
> >
> > Graduate Student,
> > Florida State University.
> >
> 
> 
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Graduate Student,
Florida State University.