Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2010-11-18
Physics
Nuclear Physics
Nuclear Theory
5 pages, 4 figures
Scientific paper
An enhanced \lp\ ratio in heavy-ion relative to $p+p$ collisions has been proposed as one of the signatures for the Quark-Gluon Plasma (QGP) formation. A significantly large \Lp\ ratio of 3.5 has been observed in the mid-rapidity and low $p_T$ region in Au+Au collisions at the nucleon-nucleon center-of-mass energy of $\snn=4.9$~GeV at the Alternating Gradient Synchrotron (AGS). This is significantly larger than the value of 0.2 in $p+p$ collisions at the corresponding energy. By using the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) transport model, we demonstrate that the observed large ratio can be explained by strong absorption of $\pbar$'s ($\sim$99.9%) and $\lbar$'s ($\sim$99%) in dense nuclear matter created in these collisions. We find within the model that the initial \lp\ ratio, mainly from string fragmentation, does not depend on the collision centrality, and is consistent with that observed in $p+p$ collisions. This suggests that the observed large \Lp\ ratio at the AGS does not necessarily imply the formation of the QGP.
Bleicher Marcus
Wang Fuqiang
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