English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

Here we thoroughly discuss some weak points of the thermal model which istraditionally used to describe the hadron multiplicities measured in thecentral nucleus-nucleus collisions. In particularly, the role of conservationlaws, the values of hard-core radii along with the effects of the Lorentzcontraction of hadron eigen volumes and the hadronic surface tension aresystematically studied. It is shown that for the adequate description of hadronmultiplicities the conservation laws should be modified, whereas for thedescription of hadron yield ratios the conservation laws are not necessary atall. Also here we analyzed the usual criteria for the chemical freeze-out andfound that none of them is robust. A new chemical freeze-out criterion ofconstant entropy per hadron equals to 7.18 is suggested and a novel effect ofadiabatic chemical hadron production is discussed. Additionally, we found thatthe data for the center of mass energies above 10 GeV lead to the temperatureof the nil hadronic surface tension coefficient of about $T_0 = 147 \pm 7$ MeV.This is a very intriguing result since a very close estimate for such atemperature was obtained recently within entirely different approach. We arguethat these two independently obtained results evidence that the (tri)criticaltemperature of the QCD phase diagram is between 140 and 154 MeV. In addition,here we suggest to consider the pion and kaon hard-core radii as new fittingparameters. Such an approach for the first time allows us to simultaneouslydescribe the hadron multiplicities and the Strangeness Horn and get a very highquality fit of the available experimental data.

Investigation of hadron multiplicities and hadron yield ratios in heavy ion collisions