# Baryon-to-entropy ratio in very high energy nuclear collisions

Source: [Baryon-to-entropy ratio in very high energy nuclear collisions](<https://www.sota2.com/research/paper/68fa34541e209131ce898285>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T20:36:28.907Z

Authors: K.J. Eskola, K. Kajantie

Published: 1996-10-10T16:10:06.000Z

## Abstract

We compute as a function of rapidity $y$ the baryon number carried by quarks and antiquarks with $p\_T \> p\_0 \\approx$ 2 GeV produced in Pb+Pb collisions at TeV energies. The computation is carried out in lowest order QCD perturbation theory using structure functions compatible with HERA results. At $p\_0=2$ GeV the initial gluon density is both transversally saturated and thermalised in the sense that the energy/gluon equals to that of an ideal gas with the same energy density. Even at these high energies the initial net baryon number density at $y=0$ at $\\tau=0.1$ fm will be more than the normal nuclear matter density but the baryon-to-entropy ratio is only $(B-\\bar B)/S\\sim 1/5000$. Further evolution of the system is discussed and the final baryon-to-entropy ratio is estimated.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/nucl-th/9610015>)

[PDF](<https://arxiv.org/pdf/nucl-th/9610015.pdf>)