Krasnitz A, Venugopalan R
UCEH, Universidade do Algarve, Campus de Gambelas, P-8000 Faro, Portugal.
Phys Rev Lett. 2001 Feb 26;86(9):1717-20. doi: 10.1103/PhysRevLett.86.1717.
The initial gluon multiplicity per unit area per unit rapidity, dN/L2/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 +/- 0.01 for a wide range in g(2)mu L. Extrapolating to SU(3), we predict dN/L2/d eta for values of g(2)mu L relevant to the Relativistic Heavy Ion Collider and the Large Hadron Collider. We compute the initial gluon transverse momentum distribution, dN/L2/d(2)k( perpendicular), and show it to be well behaved at low k( perpendicular).
在高能核碰撞中,每单位面积每单位快度的初始胶子多重性,即dN/L²/dη,等于f(N)(g²μL)(g²μ)²/g²,其中μ²与碰撞核每单位面积的胶子密度成正比。对于SU(2)规范理论,我们在g²μL的广泛范围内计算出f(N)(g²μL) = 0.14 ± 0.01。外推到SU(3),我们预测了与相对论重离子对撞机和大型强子对撞机相关的g²μL值下的dN/L²/dη。我们计算了初始胶子横向动量分布,即dN/L²/d²k⊥,并表明它在低k⊥时表现良好。