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

[Viktor Mokeev]

 Dear Colleagues,

 Is there any results on evaluation of the Hybrid hadronic decay widths? I am not aware of any evaluation of these parameters. If such evaluations exist, it would be worth of looking into them in order to respond on the correct review question on how we estimate the hybrid decay width.

 In regards of e.m. excitation/decay hybrid amplitude, I know only simple minded estimates based on the counting rule. We refer the appropriate papers. However, they are not applicable at Q^2<1.0 GeV^2. This range of photon virtualities is fully disconnected to the asymptotic regime for the counting rules.

  Best Regards,
                Victor

----- Original Message -----
From: "annalisa dangelo" <annalisa.dangelo at roma2.infn.it>
To: "hybrid baryons" <hybrid_baryons at jlab.org>
Sent: Saturday, May 7, 2016 6:01:33 AM
Subject: Re: [Hybrid baryons] Table with cross section vs W, cos #theta,	#phi.

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

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