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Abstract: The PHOBOS experiment at RHIC has the unique capability of measuring particleproduction at very low transverse momenta. New results on low-transversemomentum invariant yields of pions, kaons, protons and antiprotons in 200 GeVAu+Au collisions are presented as a function of the collision centrality forthe 50% most central events. In contrast to the results from d+Au collisions,no $m {T}$ scaling is observed in the very low $p {T}$ region. The lowtransverse momentum yields agree with extrapolations from intermediatetransverse momentum measurements. For all collision centralities a flatteningof the transverse momentum spectra is observed, consistent with a rapidtransverse expansion of the system.



Autor: Tomasz Gburek, for the PHOBOS Collaboration

Fuente: https://arxiv.org/







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