Analyzing high-energy factorization beyond next-to-leading logarithmic accuracy

Analyzing high-energy factorization beyond next-to-leading logarithmic accuracy
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分析超越对数精度的高能量分解

DOI:
10.1007/jhep02(2015)029
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发表时间:
2014
影响因子:
5.4
通讯作者:
L. Vernazza
L. Vernazza
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
V. Duca;G. Falcioni;L. Magnea;L. Vernazza

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A bstractWe provide a complete and detailed study of the high-energy limit of four-parton scattering amplitudes in QCD, giving explicit results at two loops and higher orders, and going beyond next-to-leading logarithmic (NLL) accuracy. Building upon recent results, we use the techniques of infrared factorization to investigate the failure of the simplest form of Regge factorization, starting at next-to-next-to-leading logarithmic accuracy (NNLL) in ln(s/|t|). We provide detailed accounts and explicit expressions for the terms responsible for this breaking in the case of two-loop and three-loop quark and gluon amplitudes in QCD; in particular, we recover and explain a known non-logarithmic double-pole contribution at two-loops, and we compute all non-factorizing single-logarithmic singular contributions at three loops. Conversely, we use high-energy factorization to show that the hard functions of infrared factorization vanish in d = 4 to all orders in the coupling, up to NLL accuracy in ln(s/|t|). This provides clear evidence for the infrared origin of high-energy logarithms. Finally, we extend earlier studies to t-channel exchanges of color representations beyond the octet, which enables us to give predictions based on the dipole formula for single-pole NLL contributions at three and four loops.
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发表时间: 2004-03
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期刊: Physical Review D
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