Abstract
The interpretation of quark ($q$)- antiquark ($\bar q$) pairs production and the sequential string breaking as tunneling through the event horizon of colour confinement leads to a thermal hadronic spectrum with a universal Unruh temperature, $T \simeq 165$ Mev,related to the quark acceleration, $a$, by $T=a/2\pi$. The resulting temperature depends on the quark mass and then on the content of the produced hadrons, causing a deviation from full equilibrium and hence a suppression of strange particle production in elementary collisions. In nucleus-nucleus collisions, where the quark density is much bigger, one has to introduce an average temperature (acceleration) which dilutes the quark mass effect and the strangeness suppression almost disappears.
Highlights
Hadron production in high energy collisions shows remarkably universal thermal features
In this contribution we briefly review the Hawking-Unruh hadronization approach and show that when the quark density is much bigger than in elementary scattering, as in relativistic heavy ion collisions, the effect of strange quark mass is washed out by the average acceleration due to the large number of light quarks and the strangeness suppression disappears
We show in table 1 the temperatures obtained for σ = 0.2 GeV2 and three different strange quark masses
Summary
Hadron production in high energy collisions shows remarkably universal thermal features. In ref.[13] it has been shown that strangeness suppression in elementary collisions naturally occurs in this framework without requiring an ad-hoc suppression factor due to the non-negligible strange quark mass, which modifies the emission temperature for such quarks. In this contribution we briefly review the Hawking-Unruh hadronization approach and show that when the quark density is much bigger than in elementary scattering, as in relativistic heavy ion collisions, the effect of strange quark mass is washed out by the average acceleration due to the large number of light quarks and the strangeness suppression disappears
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