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The initial gluon multiplicity in heavy ion collisions

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arxiv hep-ph/0007108 v1 pith:33JOFQFG submitted 2000-07-11 hep-ph nucl-exnucl-th

classification hep-phnucl-exnucl-th
keywords gluoninitialunitareacollidercollisionscomputeheavy
verification ladder T0 review T1 audit T2 compute T3 formal
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The initial gluon multiplicity per unit area per unit rapidity, dN/L^2/d\eta, in high energy nuclear collisions, is equal to f_N (g^2\mu L) (g^2\mu)^2/g^2, with \mu^2 proportional to the gluon density per unit area of the colliding nuclei. For an SU(2) gauge theory, we compute f_N (g^2\mu L)=0.14\pm 0.01 for a wide range in g^2\mu L. Extrapolating to SU(3), we predict dN/L^2/d\eta for values of g^2\mu L in the range relevant to the Relativistic Heavy Ion Collider and the Large Hadron Collider. We compute the initial gluon transverse momentum distribution, dN/L^2/d^2 k_\perp, and show it to be well behaved at low k_\perp.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. 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.

  2. QCD-Gravity double copy in Regge asymptotics: from $2\rightarrow n$ amplitudes to radiation in shockwave collisions

    hep-th 2025-07 accept novelty 3.0 of 10

    A lecture-note synthesis showing that the same Lipatov vertices and reggeized propagators govern multi-particle production in QCD and gravity, with double-copy, Weinberg soft, and shockwave limits all connected in one...

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