QCD matrix elements plus parton showers. The NLO case

被引：493

作者：

Hoeche, Stefan ^{[1
]}

Krauss, Frank ^{[2
]}

Schoenherr, Marek ^{[2
]}

Siegert, Frank ^{[3
]}

机构：

[1] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[2] Univ Durham, Inst Particle Phys Phenomenol, Durham DH1 3LE, England

[3] Univ Freiburg, Inst Phys, D-79104 Freiburg, Germany

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2013年 / 04期

基金：

美国国家科学基金会;

关键词：

Monte Carlo Simulations; NLO Computations;

D O I：

10.1007/JHEP04(2013)027

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 present a process-independent technique to consistently combine next-to-leading order parton-level calculations of varying jet multiplicity and parton showers. Double counting is avoided by means of a modified truncated shower scheme. This method preserves both the fixed-order accuracy of the parton-level result and the logarithmic accuracy of the parton shower. We discuss the renormalisation and factorisation scale dependence of the approach and present results from an automated implementation in the SHERPA event generator using the test case of W-boson production at the Large Hadron Collider. We observe a dramatic reduction of theoretical uncertainties compared to existing methods which underlines the predictive power of our novel technique.

引用

页数：22

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