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arXiv · 0804.4270

Energy and centrality dependence of particle production at very low transverse momenta in Au+Au collisions

Tomasz Gburek
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Abstract

The PHOBOS experiment at RHIC has the unique capability of measuring particle production at very low transverse momenta. New results on low-transverse momentum invariant yields of pions, kaons, protons and antiprotons in 200 GeV Au+Au collisions are presented as a function of the collision centrality for the 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 low transverse momentum yields agree with extrapolations from intermediate transverse momentum measurements. For all collision centralities a flattening of the transverse momentum spectra is observed, consistent with a rapid transverse expansion of the system.

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Tomasz Gburek. 2008-04-27. Energy and centrality dependence of particle production at very low transverse momenta in Au+Au collisions. https://doi.org/10.1088/0954-3899%2F35%2F10%2F104131

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