[Hybrid baryons] moment analysis

[Viktor Mokeev]

Hi All,

 Based on the Volker proposal, I would suggest Evgeny will extend chi^2/d.p evaluation employing in the sum also the induced Lambda recoil polarization. I hope Dan has the expression for the amplitude combination for this observable under Ghent amplitude convention. After these expressions will be available, I guess it will be straightforward for Evgeny and also for Annalisa and Lucilla to implement them to the codes.

   Best Regards,
                     Victor

----- Original Message -----
From: "burkert" <burkert at jlab.org>
To: "hybrid baryons" <hybrid_baryons at jlab.org>
Sent: Sunday, March 13, 2016 8:38:55 PM
Subject: [Hybrid baryons] moment analysis

Dear all,

  At our previous meeting we discussed to extend the moment analysis to 
the interference terms in the differential K-Lambda cross section. What 
we have not included in our discussion in any detail is the fact that 
the electron beam is highly spin polarized and that in the K+Lambda 
channel we already measure the Lambda decay to proton-pi-, and thus we 
automatically have the induced Lambda recoil polarization. With the 
polarized electron beam we then can measure the polarization transfer 
from the electron (virtual photon) to the Lambda.

In the real photon case the BnGa analysis showed that  the N(1900)3/2^+ 
state was clearly identified by using the polarization transfer data 
together with the other parts of the cross section. We will certainly do 
the same in the future data analysis as well. However it would be nice 
if we could demonstrate the sensitivity of these terms to resonance 
excitation already for the proposal.

  I am sure Daniel has those components already written down and we 
could study the Legendre expansion of those terms in the simulation as 
well.

All the best,
Volker





_______________________________________________
Hybrid_baryons mailing list
Hybrid_baryons at jlab.org
https://mailman.jlab.org/mailman/listinfo/hybrid_baryons