ABSTRACT

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ABSTRACT Measurements of high pt pion, kaon and
proton production play a central role in
the understanding of AA, pA and pp interactions.
The cleanest signature for jet-quenching is
provided by the measurement of the nuclear
modification factor RAA.
Latest NA49 results at 158 GeV on RCP
comparing central to peripheral collisions
indicate a picture which is qualitatively
similar to the RHIC at a somewhat weaker
scale. In order to better understand the
picture one needs high pt pp, and pA data to
be able to disentangle the Cronin- and
jet-quenching effects.
High statistic high precision pp data on
charged pion production was published by the
NA49 collaboration up to pt of 2.2 GeV/c. By
accepting reduced accuracy the pt range can be
increased at least by 0.5 GeV/c. As in the case
of RHIC experiments one can compare the pp and
AA particle yields in exactly the same detector
which will minimize the systematic effects.


. The present pp statistics is surely not
enough to go above 3 GeV/c in pt. It will be
shown how far one can go in the near future
using the upgraded NA49 detector at 17.3 GeV
CM-energy. NA49-future proposal, Study of Hadron
Production in Hadron-Nucleus and Nucleus-Nucleus
Collisions at the CERN SPS, CERN-SPSC-2006-034
SPSC-P-330 Assuming the existence of an effect
of transverse spectra modification at 17.3 GeV,
one is wondering is there a threshold energy
somewhere at lower value? In the long- run the
FAIR accelerator is planned to provide at the
CBM-detector 1011 proton/sec beam intensity
upto 90 GeV energy. This unprecendented
luminosity provides a unique possibility to
extend the pt range into practically unknown
territory. The perspectives of these extreme
luminosities will be discussed.

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C. Alt et al., Nucl.Phys. A 774, 473 (2006),
arXiv nucl-ex/0510054
T. Schuster et al., submitted to J. Phys. G,
arXiv nucl-ex/0606005
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M(?i) N(?i) N(?i1 ) in 2???bins
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