[Clascomment] Sigma Ad Hoc -Extended review

[Michael Dugger]

Reinhard,

The committee thanks you for your continuing involvement in the review 
process.

Sincerely,
Michael

On Fri, 29 Jan 2010, Reinhard Schumacher wrote:

> Dear Sergio, Mike, et al.,
>
> 	I have looked at the new version of the K+ Sigma- paper, and I am 
> impressed by the improvements.  The paper looks better (i.e. more convincing) 
> than before.  Let me make some specific remarks about what I see.
>
> Figure 1: Having the dotted line that represents the background contribution 
> makes the whole graph make better sense to me.  The figure caption and the 
> claimed "3 sigma" cut now look fine.
>
> Figure 2: This is much better with the overlay of the Monte Carlo spectrum. 
> The reader will now be satisfied that the CLAS resolution for this situation 
> just happens to indeed look sort of like a Lorentzian function.   I don't 
> think it detracts from the message that the curves are a little hard to tell 
> apart.   That is what we want!
>
> Figure 3: Very impressive.  It is now clear at a glance that at the higher 
> energies the cross section goes up in the backward direction. Not only that, 
> but the theory absolutely fails in the backward direction, but an order of 
> magnitude.  This latter observation was not visible in the previous version 
> of the plot.  Thus, plotting on the semi-log scale shows both the data and 
> the theory better, and that can only help the impact of the paper.
>
> This can be highlighted in the text.  At the end of page 4 you already 
> mention that u-channel may be present, so I would leave that sentence alone. 
> But on page 5 near the end of the left column you have a sentence "The model, 
> however, overestimates..."  What you have stated is not a accurate as it 
> could be.  How about:  "The Regge-based model overestimates our results at 
> forward and intermediate angles by about a factor of two.  At backward angles 
> the calculated cross section is too small by an order or magnitude, which is 
> a reflection of the lack of resonances in the model."
>
> I think with these changes I have no other objections to sending off the 
> paper for publication.
>
> Regards,
> Reinhard.
>
> -- 
> ________________________________________________________________________
> Reinhard Schumacher                            phone: 412-268-5177
> Department of Physics, 5000 Forbes Ave.        fax:   412-681-0648
> Carnegie Mellon University                     email: schumacher at cmu.edu
> Pittsburgh, PA 15213, U.S.A.         web: www-meg.phys.cmu.edu/~schumach
> ________________________________________________________________________
>