Phys. Rev. Lett. 86, 1717 - 1720 (2001)Initial Gluon Multiplicity in Heavy-Ion Collisions |
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Alex Krasnitz
UCEH, Universidade do Algarve, Campus de Gambelas, P-8000 Faro, Portugal
Raju Venugopalan
Physics Department, Brookhaven National Laboratory, Upton, New York 11973
Received 14 July 2000
The initial gluon multiplicity per unit area per unit rapidity, dN/L2/dη, in high energy nuclear collisions, is equal to fN(g2μL) (g2μ)2/g2, with μ2 proportional to the gluon density per unit area of the colliding nuclei. For an SU(2) gauge theory, we compute fN(g2μL) = 0.14±0.01 for a wide range in g2μL. Extrapolating to SU(3), we predict dN/L2/dη for values of g2μL relevant to the Relativistic Heavy Ion Collider and the Large Hadron Collider. We compute the initial gluon transverse momentum distribution, dN/L2/d2k⊥, and show it to be well behaved at low k⊥.
©2001 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v86/p1717
DOI: 10.1103/PhysRevLett.86.1717
PACS: 24.85.+p, 12.38.Mh, 25.75.-q
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