Achieving high baryon densities in the fragmentation regions in heavy ion collisions at top RHIC energy

Workshop for young scientists on the physics of ultrarelativistic nucleus-nucleus collisions 2016

Li, Ming^1 ; Kapusta, Joseph I.^1

School of Physics and Astronomy, University of Minneosota, Minneapolis

MN

55455, United States^1

关键词: Baryon density;    Energy-momentum tensor;    Heavy ion collision;    Nuclear densities;    Nuclear excitation;    Space time;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/832/1/012058/pdf
DOI  :  10.1088/1742-6596/832/1/012058

来源: IOP

【 摘 要 】

Heavy ion collisions at extremely high energy, such as the top energy at RHIC, exhibit the property of transparency where there is a clear separation between the almost net-baryon-free central rapidity region and the net-baryon-rich fragmentation region. We calculate the net-baryon rapidity loss and the nuclear excitation energy using the energy-momentum tensor obtained from the McLerran-Venugopalan model. Nuclear compression during the collision is further estimated using a simple space-time picture. The results show that extremely high baryon densities, about twenty times larger than the normal nuclear density, can be achieved in the fragmentation regions.