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首页> 外文期刊>Nuclear Physics, A: Journal Devoted to the Experimental Study of the Fundamental Constituents of Matter and Their Actions >Multiple parton scattering in nuclei: heavy quark energy loss and modified fragmentation functions
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Multiple parton scattering in nuclei: heavy quark energy loss and modified fragmentation functions

机译：原子中的多个parton散射：重夸克能量损失和改进的碎裂功能

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摘要

Multiple scattering, induced radiative energy loss and modified fragmentation functions of a heavy quark in nuclear matter are studied within the framework of generalized factorization in perturbative QCD. Modified heavy quark fragmentation functions and energy loss are derived in detail with illustration of the mass dependencies of the Landau-Pomeranchuk-Migdal interference effects and heavy quark energy loss. Due to the quark mass dependence of the gluon formation time, the nuclear size dependencies of nuclear modification of the heavy quark fragmentation function and heavy quark energy loss are found to change from a linear to a quadratic form when the initial energy and momentum scale are increased relative to the quark mass. The radiative energy loss of the heavy quark is also significantly suppressed due to limited cone of gluon radiation imposed by the mass. Medium modification of the heavy quark fragmentation functions is found to be limited to the large z region due to the form of heavy quark fragmentation functions in vacuum. (c) 2005 Elsevier B.V. All rights reserved.
机译：在扰动QCD的广义因式分解框架内，研究了核物质中一个重夸克的多重散射，诱导辐射能损失和修饰的碎裂功能。修改后的重夸克碎裂函数和能量损失通过对Landau-Pomeranchuk-Migdal干扰效应和重夸克能量损失的质量依赖性进行了详细说明。由于胶子形成时间的夸克质量依赖性，发现当初始能量和动量尺度增加时，重夸克碎裂函数的核修饰和重夸克能量损失的核尺寸依赖性从线性变为二次形式。相对于夸克质量。由于质量施加的胶子辐射锥度有限，重夸克的辐射能量损失也得到了显着抑制。由于在真空中重夸克碎裂函数的形式，发现重夸克碎裂函数的介质修饰被限制在较大的z区域。 （c）2005 Elsevier B.V.保留所有权利。

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