RG-improved single-particle inclusive cross sections and forward-backward asymmetry in t(t)over-bar production at hadron colliders

被引：0

作者：

Ahrens, Valentin ^{[1
]}

Ferroglia, Andrea ^{[2
]}

Neubert, Matthias ^{[1
]}

Pecjak, Ben D. ^{[1
]}

Yang, Li Lin ^{[3
]}

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Phys THEP, D-55099 Mainz, Germany

[2] New York City Coll Technol, Brooklyn, NY 11201 USA

[3] Univ Zurich, Inst Theoret Phys, CH-8057 Zurich, Switzerland

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2011年 / 09期

基金：

美国国家科学基金会; 瑞士国家科学基金会;

关键词：

Heavy Quark Physics; Hadronic Colliders; QCD; HEAVY-QUARK PRODUCTION; DOUBLE-REAL RADIATION; QCD CORRECTIONS; THRESHOLD EXPANSION; CHARGE ASYMMETRY; PAIR PRODUCTION; RESUMMATION; HADROPRODUCTION; COLLISIONS; 2-LOOPS;

D O I：

10.1007/JHEP09(2011)070

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We use techniques from soft-collinear effective theory (SCET) to derive renormalization-group improved predictions for single-particle inclusive (1PI) observables in top-quark pair production at hadron colliders. In particular, we study the top-quark transverse-momentum and rapidity distributions, the forward-backward asymmetry at the Tevatron, and the total cross section at NLO+NNLL order in resummed perturbation theory and at approximate NNLO in fixed order. We also perform a detailed analysis of power corrections to the leading terms in the threshold expansion of the partonic hard-scattering kernels. We conclude that, although the threshold expansion in 1PI kinematics is susceptible to numerically significant power corrections, its predictions for the total cross section are in good agreement with those obtained by integrating the top-pair invariant-mass distribution in pair invariant-mass kinematics, as long as a certain set of subleading terms appearing naturally within the SCET formalism is included.

引用

页数：55

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