Abstract
We compute as a function of rapidity y the baryon number carried by quarks and antiquarks with p T > p 0 ≈ 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 τ = 0.1 fin will be more than the normal nuclear matter density but the baryon-toentropy ratio is only (B-B̄)/S ∼ 1/5000. Further evolution of the system is discussed and the final baryon-to-entropy ratio is estimated.
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Eskola, K., Kajantie, K. Baryon-to-entropy ratio in very high energy nuclear collisions. Z Phys C - Particles and Fields 75, 515–522 (1997). https://doi.org/10.1007/s002880050495
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DOI: https://doi.org/10.1007/s002880050495