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arXiv 0705.1147nucl-thhep-ph
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高扭转射流展宽和经典传播

Higher twist jet broadening and classical propagation

A. Majumder, B. Müller

摘要:

在共线极限下研究了大核深度非弹性散射(DIS)中喷注的横向展宽。对一类介质增强的高扭转修正进行了重新求和,计算了共线射流的横向动量分布。与以前的方法相比,remmation的领先长度增强高扭转校正示出导致一个二维扩散方程的横向动量的传播射流。从这种方法获得的平均横向动量的结果进行比较,预期从一个经典的朗之万分析的波动色洛伦兹力的作用下的核子内的射流的传播的加宽。的一组近似,导致相同的结果,从两种方法的概述。导出了动量扩散常数$D$与输运系数$\hat{q}$之间的关系式。

英文摘要:

The transverse broadening of jets produced in deep-inelastic scattering (DIS) off a large nucleus is studied in the collinear limit. A class of medium enhanced higher twist corrections are re-summed to calculate the transverse momentum distribution of the produced collinear jet. In contrast to previous approaches, resummation of the leading length enhanced higher twist corrections is shown to lead to a two dimensional diffusion equation for the transverse momentum of the propagating jet. Results for the average transverse momentum obtained from this approach are then compared to the broadening expected from a classical Langevin analysis for the propagation of the jet under the action of the fluctuating color Lorentz force inside the nucleons. The set of approximations that lead to identical results from the two approaches are outlined. The relationship between the momentum diffusion constant $D$ and the transport coefficient $\hat{q}$ is explicitly derived.

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