Ruprecht Karls Universität Heidelberg

Relativistic Heavy-Ion Physics

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Heavy-ion collisions at LHC energies

Some of the methods and results of the theoretical treatments outlined in the preceeding projects are very suitable for an extension to energies reached at the Large Hadron Collider. Indeed, we have already made predictions for Pb + Pb collisions at LHC energies both with the nonequilibrium-statistical approach (see [1] for a short review with references), and in a qcd-inspired partonic model [2,3].

The consequences of the second approach for the midrapidity region in net baryons (baryons minus antibaryons, indicative for stopping and energy loss in the collision) are still being explored. Here the first data from ALICE for central collisions with particle identification with soon be available, hopefully already end of 2010. These will be compared with our predictions for the midrapidity region.

Regarding the physically more interesting region of large rapidities close to the fragmentation peak in net baryons, extensions of the experimental apparatus will be required to provide particle identification at small angles. This region is particularly interesting for the test of gluon saturation in net-baryon distributions. For produced charged hadronbs, such tests can also be performed at midrapidity where particle identification will be available.

We shall further pursue this line of research in close contact with the upcoming experimental results that will be used to test our predictions, as well as influence future theoretical directions.

1. G. Wolschin, Prog. Part. Nucl. Phys. 59, 374 (2007).
2. Y. Mehtar-Tani and G. Wolschin, Phys. Rev. C 80, 054905 (2009); Phys. Rev. Lett. 102, 182301 (2009).
3. Y. Mehtar-Tani and G. Wolschin, Phys. Lett. B 688, 174 (2010).

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