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arXiv 0704.0612hep-phnucl-th
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含运行耦合修正的高能演化方程的求解

Solving The High Energy Evolution Equation Including Running Coupling Corrections

Javier L. Albacete, Yuri V. Kovchegov

摘要:

我们研究了具有最近计算的运行耦合修正的非线性BK演化方程的解[hep-ph/0609105,hep-ph/0609090]。进行数值求解,我们证实了[hep-ph/0408216]的早期结果,即运行耦合的高能量演化导致偶极子散射振幅的普遍标度行为。最近计算的运行耦合校正显着改变的形状的标度函数相比,固定耦合的情况下,导致相当大的增加异常尺寸和减慢的演变与快速。最近的两个计算之间的差异是由于一个额外的贡献的演变内核,被称为减法项,这产生时,运行耦合校正包括在内。这些减法项在最近的两次计算中都被忽略了。我们数值计算的减法项,并证明,当减法项被添加回两个工程中得到的演化内核所得到的偶极子振幅彼此一致!然后,我们使用完整的运行耦合内核,包括减法项,找到所产生的完整的非线性演化方程的数值解与运行耦合校正。同样,标度制度恢复非常大的速度。

英文摘要:

We study the solution of the nonlinear BK evolution equation with the recently calculated running coupling corrections [hep-ph/0609105, hep-ph/0609090]. Performing a numerical solution we confirm the earlier result of [hep-ph/0408216] that the high energy evolution with the running coupling leads to a universal scaling behavior for the dipole scattering amplitude. The running coupling corrections calculated recently significantly change the shape of the scaling function as compared to the fixed coupling case leading to a considerable increase in the anomalous dimension and to a slow-down of the evolution with rapidity. The difference between the two recent calculations is due to an extra contribution to the evolution kernel, referred to as the subtraction term, which arises when running coupling corrections are included. These subtraction terms were neglected in both recent calculations. We evaluate numerically the subtraction terms for both calculations, and demonstrate that when the subtraction terms are added back to the evolution kernels obtained in the two works the resulting dipole amplitudes agree with each other! We then use the complete running coupling kernel including the subtraction term to find the numerical solution of the resulting full non-linear evolution equation with the running coupling corrections. Again the scaling regime is recovered at very large rapidity.

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