6533b7d9fe1ef96bd126cc99

RESEARCH PRODUCT

Numerical evaluation of NLO multiparton processes

Sebastian BeckerDaniel GoetzChristopher SchwanChristian ReuschleStefan Weinzierl

subject

Nuclear physicsPhysicsHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Electron–positron annihilationmedicineFOS: Physical sciencesmedicine.disease_causeLoop integralUltraviolet

description

We discuss an algorithm for the numerical evaluation of NLO multiparton processes. We focus hereby on the virtual part of the NLO calculation, i.e. on evaluating the one-loop integration numerically. We employ and extend the ideas of the subtraction method to the virtual part and we use subtraction terms for the soft, collinear and ultraviolet regions, which allows us to evaluate the loop integral numerically in four dimensions. A second ingredient is a method to deform the integration contour of the loop integration into the complex plane. The algorithm is derived on the level of the primitive amplitudes, where we utilise recursive relations to generate the corresponding one-loop off-shell currents. We discuss the numerical behavior of the approach and the application to the leading colour contribution in e+ e- --> n jets, with n up to seven.

yearjournalcountryeditionlanguage
2013-02-22
https://dx.doi.org/10.48550/arxiv.1209.2846