[Clascomment] OPT-IN:Differential cross sections and spin density matrix elements for the reaction gamma p --> p omega

[Mike Williams]

Dear Michel,

I have read the omega electroproduction paper and, while it was very 
interesting, I don't see a 
clear link worth adding to our paper.  It is true that we also see a 
dominant pi0 t-channel exchange at low t; however, as you say in your 
paper this has been known about omega photoproduction for some time. Since 
the electroprod results are mostly at high Q^2, I'm not sure there are any 
other "clear" (i.e. non model-dependent) statements that can be made.

Cheers,

Mike

On Tue, 21 Jul 2009, Michel Gar?on wrote:

> Dear Matthew, Curtis,
>
> I read with interest (though admittedly rather quickly) the paper on omega spin density matrix elements in photoproduction.
> CLAS also published SDME\'s in omega electroproduction (EPJA 24, 445 (2005)). Since this is at rather high Q2, I do not see any obvious connection with the present results. However, please take a quick look and see whether you can establish a conceptual link. In that paper, we could not extract sigma_T, but found through the SDME\'s that most of the transverse cross section is due to unnatural-parity exchange.
>
> Regards,
> Michel Gar?on.
>