[Clascomment] Your paper on Sigma K photoproduction

[Marco Ripani]

Hi,
from Kei Moriya (he wasn\'t able to post to clascomment)

Regards
Marco Ripani



Dear Sergio et al.,

I read your paper with interest, and I think it shows
some good data for the differential cross sections.

I have a few comments:

p.2 right 4th para. \\\"the Sigma*(1385)- decays into Sigma- pi0 with bSigma* ~ 12%\\\"

I would assume that the Sigma(1385)- would also go to Sigma0 pi-, so change
the br appropriately, or quote as \\\"decays into (Sigma pi)- with bSigma* ~ 12%\\\".
Or by \\\"bSigma*\\\" do you mean BR(Sigma(1385)- -> (Sigma pi)-)? I think this is not clear.

p.2 right 4th para. \\\"the K*(892)+ decays into K+ pi0 with bK*~100%\\\".

Again, the K*+ will have a decay mode into K0 pi+, so either correct
the br or quote as (K pi)+.

p.2 4th para. \\\"Events with a spectator proton were selected by applying
a 3sigma cut around the main peak.\\\"

In Fig 1 it seems the cut aorund the proton peak excludes a lot of
the tails. Does \\\"3 sigma\\\" mean \\\"+/- 1.5 sigma on both sides\\\"?
If so, I would think \\\"+/-1.5 sigma cut around the peak\\\" would be
less confusing.

 Also, I understand that the high side of the peak is
contaminated by background channels, but is it possible
to use the lower side that is excluded by your cut?
It seems to be well fit with just your Gaussian.

p.2 4th para. \\\"Each distribution was fitted with a Lorentzian peak\\\"

Why is a Lorentzian used for a peak that has no intrinsic width (Sigma-)?
A Gaussian or Voigtian would seem a less confusing choice, although the
fit in Fig 2 seems pretty decent.

Best regards,
          Kei Moriya