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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

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

classification hep-ph nucl-exnucl-th
keywords energycollisionsunitinitialareadensitygluonshigh
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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