Speaker
Description
Many data in the High Energy Physics are, in fact, sample means. It is shown that
when this exact meaning of the data is taken into account and the most weakly
bound states are removed from the hadron resonance gas, the acceptable fit to the
whole spectra of pions, kaons and protons measured at midrapidity in central Pb-Pb
collisions at $\sqrt{s_{NN}} = 2.76$ TeV is obtained. The invariant distributions
are predicted with the help of the Single-Freeze-Out Model (SFOM) in the chemical
equilibrium framework. The new idea introduced into the SFOM in this work is to
randomize one of the parameters of the model. It has turned out that the
successful improvement is achieved only when the freeze-out temperature becomes a
random variable and nothing is gained with the randomization of geometric
parameters of the model. Low $p_{T}$ pions and protons are reproduced simultaneously
as well as $p/\pi$ ratio. Additionally, correct predictions extend over lower
parts of large $p_{T}$ data. The method is applied to other centrality bins of
Pb-Pb collisions and the results are also presented. Some more general, possible
implications of this approach are pointed out.
Based on: D.Prorok, "Single Freeze-Out, Statistics and Pion, Kaon and Proton Production in Central Pb-Pb Collisions at $\sqrt{s_{NN}} = 2.76$ TeV'', J. Phys. G: Nuclear and Particle Physics 43 (2016) 055101.
