Re: [Brahms-l] Draft version of "Charged particle ratios from p+p collisions at .."

A few comment on the p+p draft from IGB.
The title should be changed to say, for example antiparticle to 
particle ratio.  As is, one might expect k/pi, etc.
Abstract:
write rapidity range as 0<y<3.4

Introduction.
I dislike the third paragraph, but don't have a concrete improvement 
(yet!).  What has been done by
other experiments at similar energy (UA1??).

Analysis:
why do we list the angles?  I would suggest instead a figure showing 
the acceptance for, say, pions, for all settings used.

(picky language comment:) The last sentence should be changed to:
The present analysis was performed as described in Ref(XX).
or
The analysis methods employed here are similar to THOSE described in 
Ref(XX).

Particle ratios vs. rapidity.

I think the anti-proton proton production sentence is a bit clumsy.  
(which means,   a different clumsy than my clumsy:) )
We do not have to assume that antirotons from pair production have an 
associated proton.  That is the definition of pair production.  Maybe 
something along the lines of:
assuming that the (anti-)quarks  from pair creation are equally likely 
to form particles and antiparticles, one expects the same number of 
protons and antiprotons from such processes.  Proton excess, therefore, 
is due to the transport of baryon number from the initial beams.

I guess I find it odd that 15% of the protons carry baryon number...
As for the isospin correction, this can be done by deducing the 
(anti)neutrons    from (anti)deuterons, has anyone looked into this?  
(And, yes, I know the errors would be large.  But, in principle at 
least, we can address the question)

next paragraph:
...this is surprising in view of the different dynamics ONE MIGHT 
EXPECT...
maybe our data are telling us that there isn't so much difference after 
all.  Landau would be happy ;-)

I really like the limiting fragmentation plots!  I wonder about the 
"marked divide" though.  If this were really something, shouldn't it be 
seen in the K and pi ratios as well?  Both of those are smooth as a 
baby's bottom (for the happy new daddy) in our data (though there is, 
perhaps, something similar at -1.5 in NA27 K).

That is what I have time for right now.  I would just like to add that 
none of my comments should be considered "show stoppers," just  things 
I noticed.  I'll try to read the draft more carefully over the next 
couple of days.
-Ian


On 9/7-2004, at 17:45, flemming videbaek wrote:

> Dear Collaborator,
>  
>  
> The analysis of particle ratios in pp reaction from the run-2 data have
> been worked into a near final paper by the paper committee and working 
> group consisting
> of BHSamset, KHagel, Tveter, JHLee, JNatowitz and chaired by MJMurray.
> The paper have been prepared for PLB.
>
> The data analysis have been done by BHSamset and KHagel.
> The main findings have bee been presented at several collaboration 
> meetings, and about the time of
> the Oslo meeting Bjoern and Kris had reached a consensus or their 
> semi-indecently analysis.
> More details can be found at  this page:
> http://www4.rcf.bnl.gov/~bjornhs/ppanalinks.html
> which collects all the material Bjorn have been able to find from 
> collaboration meetings, WebPages and
> analysis reports. It includes the unpublished analysis reports 
> from Bjorn and the just posted
> Analysis note 51 by Kris.
>
> We realize this is the summer period, but will like to have your 
> comments no
> later than July 30. If you have questions that relates to analysis, 
> the comments better come ASAP
>  since BUS will be much less available for a couple of weeks.
> Please send comments to Bjorn and the committee.
>
> The paper is available is several formats on can be found on .
>
>  www.fys.uio.no/~bjornhs/brahms/pp/paper/ppratios_090704_color.pdf
>  www.fys.uio.no/~bjornhs/brahms/pp/paper/ppratios_090704_color.ps
>  www.fys.uio.no/~bjornhs/brahms/pp/paper/ppratios_090704_bw.pdf
>  www.fys.uio.no/~bjornhs/brahms/pp/paper/ppratios_090704_bw.ps
>
>
>
> best regards
>     Flemming
>
>
> ----------------------------------------------------------------
> Flemming Videbaek
> Physics Department
> Brookhaven National Laboratory
>  
> e-mail: videbaek@bnl.gov
> phone: 631-344-4106
> _______________________________________________
> Brahms-l mailing list
> Brahms-l@lists.bnl.gov
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