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Description
This session of the HIF will discuss different aspects of p+A physics at the CERN SPS, especially discussing its implications for the understanding of relativistic heavy ion collisions. Also, the discussion aims at clarifying to what extent measurements of pbar+A collisions could further clarify open issues.
1. Results from NA49 on p+A
Andrzej Rybicki (Institute of Nuclear Physics, Cracow, Poland)
The distribution of net baryon number including neutrons is studied in the final state of hadron+proton and centrality defined hadron+Pb collisions. In particular, proton and pion induced reactions are used in order to separate contributions from target and projectile hemisphere. This is essential for the interpretation of the asymmetric h+A collisions. Results are compared to A+A interactions at different centrality's.
2. Exciting physics with pA collisions
by Boris Kopeliovich (MPI Heidelberg)
Dedicated experiments with p+A collisions should provide unique information about space-time development of the interaction, which cannot be accessed in hadronic collisions. Baryon number flow enhanced by multiple colour exchanges of the projectile in nuclear matter is responsible for the baryon stopping in heavy ion collisions. A better understanding of this effect can be achieved in pA interactions.
Energy loss by fast partons propagating through a medium is pretty well studied theoretically while an adequate experimental information is still lacking. This phenomenon is expected to serve as a sensitive probe for creation of a dense matter in heavy ion collisions. Broadening of transverse momentum of a parton propagating through nuclear matter results from interplay of soft and hard interactions. Measured in p+A it is a sensitive probe for saturation of gluon density in nuclei, a phenomenon, which is expected to control gluon radiation in heavy ion collisions.
3. Baryon stopping and strange baryon production in p+A and pbar+A collisions
by Alphonse Capella (LPTHE, Orsay)
Baryon stopping and strange baryon production are discussed in the framework of string models such as the Dual Parton Model with emphasis on p+A collisions and on the importance of measuring both p+A and pbar+A.
Organiser(s): Yiota Foka, Ulrich Heinz and Urs Wiedemann
Organiser(s): Yiota Foka, Ulrich Heinz and Urs Wiedemann