Scaling Properties of the Transverse Mass Spectra

Motivated from the formation of an initial state of gluon-saturated matter, we discuss scaling relations for the transverse mass spectra at BNL’s Relativistic Heavy-Ion Collider (RHIC). We show on linear plots, that the transverse mass spectra for various hadrons can be described by an universal function in mt. The transverse mass spectra for different centralities can be rescaled into each other. Finally, we demonstrate that mt-scaling is also present in proton-antiproton collider data and compare it to mt-scaling at RHIC. In this work, we report on applying scaling features of the initial state of the color glass condensate to data at RHIC, in particular to the transverse momentum distribution of hadrons (see [1, 2]). It has been suggested that in collisions of heavy-ions at ultrarelativistic bombarding energies gluons are so densely packed in phase-space that they saturate [3] and form a color glass condensate [4, 5, 6, 7, 8, 9]. The initial momentum distribution of gluons for a color-glass condensate can be described by the scaling relation [10]: 1 σ dNg dηdpt = 1 αs(Qs) fg (