[Hybrid baryons] suggestion

[Viktor Mokeev]

  Hi Gleb and Iulia,

 Please compute at the photon point and Q^2=0.65 GeV^2 (at least, if you have time at all Q^2) chi^2/d.p.(W) as the difference of the following one-fold differential cross sections:

-reference dsigma/dX computed with J^P=1/2 M=2.2 GeV state A1/2 at threshold values
-fit curve differential cross sections computed with J^P=1/2+, running resonance mass, A1/2 by 30% bigger (or smaller) that this for the reference cross sections.

 When we can speak over google talk?

   Best Regards,
                        Victor 

----- Original Message -----
From: "burkert" <burkert at jlab.org>
To: "hybrid baryons" <hybrid_baryons at jlab.org>
Sent: Saturday, April 16, 2016 12:14:05 PM
Subject: [Hybrid baryons] suggestion

Hi all,

In our proposal discussion it was often mentioned that the so-called 
Delta(chi^2) graph, which is based on checking the effect of additional 
hybrid state(s) on the chi^2 vs W by checking a model with the same model.

That is, of course, correct. However, we could do a little better by 
analyzing the model with the hybrid  state included by checking it with 
a model that has another hybrid state with different J^P quantum 
numbers. So, we would simulate data that includes, for example a J^P = 
1/2^+ and scan it with a model that includes, e.g. a 3/2^+ state or a 
3/2^-, etc.. That graph should show a quite different Delta(chi^2) vs W 
behavior (at least that's what I hope for) than the one where the model 
1/2^+ is checked with the same 1/2^+ resonance.

If these graphs looks interesting we could use this technique to test 
against resonances with other J^P values.

Regards,
Volker



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