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The initial energy density of gluons produced in very high energy nuclear collisions

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arxiv hep-ph/9909203 v3 pith:JPWCYSDQ submitted 1999-09-01 hep-ph nucl-exnucl-th

classification hep-phnucl-exnucl-th
keywords energycollisionsunitinitialareadensitygluonshigh
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

In very high energy nuclear collisions, the initial energy of produced gluons per unit area per unit rapidity, $dE/L^2/d\eta$, is equal to $f(g^2\mu L) (g^2\mu)^3/g^2$, where $\mu^2$ is proportional to the gluon density per unit area of the colliding nuclei. For an SU(2) gauge theory, we perform a non--perturbative numerical computation of the function $f(g^2\mu L)$. It decreases rapidly for small $g^2\mu L$ but varies only by $\sim 25$%, from $0.208\pm 0.004$ to $0.257\pm 0.005$, for a wide range 35.36--296.98 in $g^2\mu L$, including the range relevant for collisions at RHIC and LHC. Extrapolating to SU(3), we estimate the initial energy per unit rapidity for Au-Au collisions in the central region at RHIC and LHC.

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Cited by 3 Pith papers

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    Medium-induced gluon radiation computed with kinetic-theory backgrounds shows a persistent, non-vanishing imprint of the pre-equilibrium stage on jet spectra, so jet observables can probe early-time dynamics in heavy-...

  2. Collision energy dependence in heavy ion collisions from nonlinear QCD evolution

    nucl-th 2025-02 conditional novelty 6.0 of 10

    JIMWLK evolution of the nuclear initial state flattens the centrality dependence of multiplicity and lowers mean transverse momentum, improving data agreement at LHC energies.

  3. Constraining hot and cold nuclear matter properties from heavy-ion collisions and deep-inelastic scattering

    nucl-th 2025-04 unverdicted novelty 5.0 of 10

    Global analysis of HERA DIS and ALICE Pb+Pb data using saturation initial-state model determines early-time non-equilibrium η/s of QGP.

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