Michael Murray wrote:
DEAR MICHAEL
Many thanks for your mail. I have responded to JHL and to the list with
my views on the general publication strategy. I feel that expediency is
more important than elegance in our situation.
>
> Micha Dear Jens Jorgen,
> thanks very much for sending out the two
> drafts. Here are some remarks on
> the ratios paper.
>
> My first question is does the mechanism of stoppiing change from pp to AuAu?
> At the ISR the R-807 collaboration measured pi+-, k+-,p and pbar from pp and
> pbarp coolisions.
> They find that 16% of the pbars observered at y=0 come from the fragmentation of
> the beam.
> Note each beam had an energy of 26GeV so sqrt(s)=52GeV. They found pbar/p=.6 for
> pp collisions.
> This seems very close to our situation.
Indeed. I have on my desk the old Boeggild and Ferbel ARNS on IRS p+p.
it also looks as if
the ratio at y=2 is not too far from ours . Food for thought?
>
> I could not find anything about pbar/p from alpha alpha collisions at the ISR.
> There may be
> something in CERN-EP/84-112 by M.A. Faessler but I could not find the report on
> the Web. Hans should be an
> expert.
He is at CERN right now. Could you pursue it with him?
>
> If you are going to report K+/K- and pbar/p why not try to connect them. It
> would be simple to
> do a chemical analysis at y=0. At QM01 people were even saying that you should
> only use the
> central rapidity ratios at sqrt{s}=130GeV. Another nice way of doing this would
> be to plot
> pbar/p versus k+/k- versus sqrt{s}. This should show a clear trend. One could
> put pp results on
> the same plot.
Would you prepare a figure? We will need it anyway. If not for this
paper then for talks
and certainly in early June when we fill in the 100+100 point in a
pre-written paper!
>
> Do we still have strong pbar absorbtion at RHIC?
> does pbar/n_part (or pbar/pi) increase with centrality? At the SPS it was flat.
>
> I think it would be very useful to try to get a k+/k- ratio in the FRS.
Ian is looking at this. there is a little tiny corner in the acceptance
at very low pt that could be clean iun the toF vs p plot. If ready it
should go in.
> One idea would be to devide the mass**2 spectra directly. Presumably the pion
> contamination in the decreases with mass**2 and so the ratio should approch the
> true
> value for mass**2=.3 or so.
>
> I think it would be very good to convert the tex to latex and to include the
> plots as .eps files.
RAMI has done the dndeta, and promisewd the pbar/p for the weekend.
> I have included some references that may be useful. I will find the model ones
> too.
Many thanks
Cheers
JJ
> Yours Michael
>
> \bibitem{ZDCNim} % The RHIC Zero Degree Calorimeter
> C. Adler, et al., submitted to Nuclear Instruments and Methods,
> xxx.lanl.gov/abs/nucl-ex/0008005
>
> \bibitem{NA44PbPbK} % Strange Meson Enhancement in PbPb Collisions at 158 GeV/c
> Bearden, I.G. et al.; Phys. Lett. B 471, 6-12 (1999)
> xxx.lanl.gov/abs/nucl-ex/9907013
>
> \bibitem{ NA44Spbar} %Proton and Antiproton Distributions at Midrapidity in
> Proton-Nucleus and Sulphur-Nucleus Collisions
> Bearden, I.G. et al.; Phys. Rev. C57 837-846 (1998)
>
> \bibitem{NA44SAK} % Charged Kaon and Pion Production at Midrapidity in
> Proton-Nucleus and Sulphur-Nucleus Collisions} \\
> Boggild, H. et al.; Phys. Rev. C59 328-359 (1999)
> xxx.lanl.gov/abs/nucl-ex/9808002
> % K-/K+ at y_cm falls from pBe to SPb while pbar/p increases.
>
> \bibitem{ NA49pbar} % Antiproton production in nuclear collisions at 158 A
> GeV/c
> G.I. Veres et al., Nucl. Phys. A 661 383c-386c.
> \bibitem{NA49stop} %Stopping: from peripheral to Central Nuclear Collisions at
> the SPS
> G.E. Cooper et al., Nucl. Phys. A 661 362c-365c
> % Beautiful proton distributions versus rapidity and centrality.
>
> \bibitem{NA49kaon} % Strangeness production in nuclear collisions-recent
> results from NA49.
> C Hohne et al., Nucl. Phys. A 661 485c-488c
> % Shows k+/pi and k-/pi vs sqrt{s} for AA and pp
> \bibitem{NA49QM99} F. Sikler et al., % Hadron Production from NA49 at 158GeV/c/A
> % K+ and K- increase with n_part whereas pbar does not
> \bibitem{NA52QM99} %Impact parameter dependence of pi+-,K+- ,pbar,d & dbar for
> PbPb
> S. Kabana et al., Nucl. Phys. A 661 370c-373c
> % At low Pt pbar/n_part FALLS as n_part increases while K+/n_part and K-/n_part
> increase.
> el Murray, Cyclotron TAMU, 979 845 1411 x 273, Fax 1899
--
____________________________________________________
JENS JORGEN GAARDHOJE
Assoc. Prof. of Physics, Dr. Scient.
Niels Bohr Institute,
University of Copenhagen
Blegdamsvej 17, 2100 Copenhagen
Denmark.
Tlf: (+45) 35 32 53 09 (dir)
(+45) 35 32 52 09 (secr)
Fax: (+45) 35 32 50 16
Email: gardhoje @ nbi.dk
Home page: http://alf.nbi.dk/~gardhoje
-Chair Ph. D. School of Physics at NBI.F.AFG.
(secr. Frank Kristensen 35 32 04 41, Ørsted Lab.)
-Member Danish National Commission for UNESCO
(secr. Ulla Holm 35 32 52 72, NBI)
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