Date: Thursday January 28, 2016 at 4pm
Location: 223 Herman Brown Hall, Rice University
Title: The Hadron pT Distribution in High-Energy pp Collisions and its Implications
Speaker: Cheuk-Yin Wong (ORNL)
Abstract: Transverse momentum distribution of jets and hadrons provide useful information on the collision mechanisms and their subsequent dynamics. It was found recently that the hadron spectra spanning over 14 decades of magnitude from the lowest of ~0.5 GeV/c to the highest $p_T$ of a few hundred GeV/c at central rapidity in pp collisions at LHC can be adequately described by a single Tsallis distribution with only three
apparent degrees of freedom [1]. The simplicity of the p_T spectrum suggests that a single mechanism dominates over a large pT domain at central rapidity in these high-energy collisions. As the high-$p_T$ region is known to arise from the relativistic hard-scattering process at high pT, one is led to the suggestion that the hard-scattering process dominates over a very large pT domain in these high-energy pp collisions. We shall explore the implications of the pT distribution on many related topics of the diminishing role of the competing flux-tube fragmentation [2] and the initial conditions for the momentum kick model of the near-side ridge in pp collisions [3].
apparent degrees of freedom [1]. The simplicity of the p_T spectrum suggests that a single mechanism dominates over a large pT domain at central rapidity in these high-energy collisions. As the high-$p_T$ region is known to arise from the relativistic hard-scattering process at high pT, one is led to the suggestion that the hard-scattering process dominates over a very large pT domain in these high-energy pp collisions. We shall explore the implications of the pT distribution on many related topics of the diminishing role of the competing flux-tube fragmentation [2] and the initial conditions for the momentum kick model of the near-side ridge in pp collisions [3].
[1] C.Y.Wong and G.Wilk, Acta Phys. Pol. {B43}, 2047 (2012);
C.Y.Wong and G.Wilk, Phys. Rev. {D87},114007 (2013);
C. Y. Wong, G. Wilk, L. J. L. Cirto and C. Tsallis, Phys. Rev. {D91}, 114027 (2015).
[2] C.Y.Wong, Phys.Rev. {D92}, 074007 (2015).
[3] C.Y.Wong, Phys.Rev. {C84}, 024901 (2011).
C.Y.Wong and G.Wilk, Phys. Rev. {D87},114007 (2013);
C. Y. Wong, G. Wilk, L. J. L. Cirto and C. Tsallis, Phys. Rev. {D91}, 114027 (2015).
[2] C.Y.Wong, Phys.Rev. {D92}, 074007 (2015).
[3] C.Y.Wong, Phys.Rev. {C84}, 024901 (2011).