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

[mkunkel 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
>> >
>>
>>
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>
> Graduate Student,
> Florida State University.
>