Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 1: QCD and electroweak interactions (theory)

T 1.4: Vortrag

Montag, 15. März 2021, 16:45–17:00, Ta

On the automated calculation of beam functions in Soft-Collinear Effective Theory — Guido Bell, Kevin Brune, Goutam Das, and •Marcel Wald — Center for Particle Physics Siegen, Theoretische Physik 1, Universität Siegen

Over the last decades, factorization theorems became an important method to tackle problems in perturbative QCD, especially within the framework of effective field theories. In Soft-Collinear Effective Theory, these factorization theorems include beam functions accounting for the initial-state collinear interactions. While these functions have been calculated case by case for different observables until now, we are investigating an automated approach for a general class of observables. For this, we study a general phase-space parameterization which factorizes the singularities of the beam function in an universal way. This approach has been implemented in the public code "pySecDec" in order to calculate the next-to-leading order and part of the next-to-next-to leading order beam function.