[Clas_hadron] dnp presentation

[A.M. Sandorfi]

Dear Chandra,

Interesting results. Beyond the comments others have made, the third bullet
on your conclusion slide is not likely. In general, polarization observables
will be sensitive to interfering multipoles that will be channel dependent.
But we could make a simple model and ignore that: the processes you are
comparing are gp-> K0 Sigma+ and gp -> K+ Sigma0. The photon doesn't
conserve isospin and can act as a scalar or a vector. In the former case,
the ratio of the isospin Clebsch coeff for these two decay channels is
-sqrt(2); for the latter, the ratio is +1/sqrt(2). So you could get a sign
change it the scalar photon interaction dominated. ...but it's a stretch to
assume such a simple isospin dependence for such matrix elements. In any
case your 4th bullet is correct.

Andy





On 10/26/11 5:30 PM, "Volker Crede" <crede at fsu.edu> wrote:

> Dear Chandra,
> 
> the results look interesting, indeed. The Sigma^0 and Sigma^+ results differ,
> but appear to be very similar in shape; the difference for the polarization
> seems to be about one independent of angle and energy.
> 
> In addition to the previous comments:
> 
> * I also do not understand the argument for the QGP, at least not in the sense
> we usually discuss QGP. Perhaps you should take it out.
> 
> * You need to be more consistent with the symbol for the proton (should be
> lower case p) and for the polarization (should be upper case P). It is
> confusing on some slides where you use P for both.
> 
> Good luck
> 
>         Volker
> 
> 
> On Oct 26, 2011, at 10:35 AM, cnepali at jlab.org wrote:
> 
>> Dear all,
>> 
>> I will be giving a talk at DNP meeting on Oct 28th. The talk is
>> http://wwwold.jlab.org/Hall-B/secure/hadron/presentations/2011/dnp2011_chandr
>> a.pdf
>> . Sorry it is late. Please send me your comment and suggestion.
>> 
>> Thanks,
>> Chandra
>> 
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> 
> 
> 
> 
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