[Hybrid baryons] Table with cross section vs W, cos #theta, #phi.

[Annalisa D'Angelo]

Dear Victor, Evgeny and All,

Lucilla has computed the four-fold electron scattering differential 
cross section:
d^4 sigma/dQ2 dW dOmega_k, as Victor defines in point a).

Since dW units are GeV and Q2 units are GeV{2} the four-fold electron 
scattering differential cross section units
are micro barn GeV{-3}/sr.

Since the virtual photon Flux and polarization depend on the electron 
beam energy, we should also specify that the
tables were evaluated at 6.6 GeV. (Lucilla please correct me if I am wrong)

All the best
Annalisa
Il 06/05/16 20:25, Viktor Mokeev ha scritto:
> Dear Colleagues,
>
>   We need to clarify which cross section you are using. Whether they are
> a)dsigma/(dW*dQ^2domega_{K}} exclusive cross sections for electron scattering, or
> b)dsigma/domega_{K} for exclusive virtual photon cross section.
>
> My guess is: Evgeny is using b) with units GeV{-2}/Ster
>
> Lucilla uses
>
> mcbarn/(Sr GeV^3)
>
> It looks like the electron scattering exclusive KY cross section in which virtual photon cross sections was converted from GeV{-2}/Ster to
> mcbarn/(Sr), while GeV^{-3} comes from 1/(dW*dQ^2) from extra differentials for exclusive electron scattering cross section.
>
> Evgeny and Lucilla, please come to common units and common cross sections. Both a) and b) cross sections are equally fine. GeV{-2}/Ster or
> mcbarn/Ster units are equally fine. However, you have to use the common units in order to be able to fit the cross sections from each other.
>
>    Best Regards,
>                      Victor
>
> ----- Original Message -----
> From: "Evgeny Golovach" <golovach at jlab.org>
> To: "hybrid baryons" <hybrid_baryons at jlab.org>
> Sent: Friday, May 6, 2016 2:05:25 PM
> Subject: [Hybrid baryons] Table with cross section vs W, cos #theta, #phi.
>
> Dear All,
>
> Lucilla, I am sending you my table.
> It is in the same format.
> I guess, your cross sections is in the units of GeV^{-2}.
> I used the same units.
>
> Regards,
>    Evgeny
>
>
>> Dear all,
>>
>> here is the table with the unpolarized cross section vs phi, cos theta
>> and W.
>> We used ifstream and ofstream classes to read and write it.
>>
>> Best regards,
>>
>> Annalisa and Lucilla_______________________________________________
>> Hybrid_baryons mailing list
>> Hybrid_baryons at jlab.org
>> https://mailman.jlab.org/mailman/listinfo/hybrid_baryons
>>
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-- 
================================================
Prof. Annalisa D'Angelo
Dip. Fisica, Universita' di Roma "Tor Vergata"
INFN Sezione di Roma Tor Vergata, Rome Italy
email:annalisa.dangelo at roma2.infn.it
Jefferson Laboratory, Newport News, VA USA
Email: annalisa at jlab.org
Tel: + 39 06 72594562
Fax: + 39 06 2040309