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arXiv 1005.1606hep-ph
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非对角分裂函数和系数函数的超前对数大x表示

Leading logarithmic large-x resummation of off-diagonal splitting functions and coefficient functions

A. Vogt

摘要:

本文分析了大x极限下未因式分解部分子结构函数的迭代结构,导出了Higgs-玻色子和规范-玻色子交换深度非弹性散射中首对数非对角分裂函数P_gq和P_qg以及相应的系数函数C_phi,q和C_2,g的全阶表达式。分裂函数是用微扰QCD中从未遇到过的一个新函数给出的,并且在超对称极限C_A-C_F到0处最大为零。系数函数在此极限下不为零,并由上述新函数和著名的超前对数阈值指数的简单表达式给出。我们的结果也适用于碎裂函数和半包含e^+ e^-湮没的演化。

英文摘要:

We analyze the iterative structure of unfactorized partonic structure functions in the large-x limit, and derive all-order expressions for the leading-logarithmic off-diagonal splitting functions P_gq and P_qg and the corresponding coefficient functions C_phi,q and C_2,g in Higgs- and gauge-boson exchange deep-inelastic scattering. The splitting functions are given in terms of a new function not encountered in perturbative QCD so far, and vanish maximally in the supersymmetric limit C_A - C_F to 0. The coefficient functions do not vanish in this limit, and are given by simple expressions in terms of the above new function and the well-known leading-logarithmic threshold exponential. Our results also apply to the evolution of fragmentation functions and semi-inclusive e^+ e^- annihilation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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