Xsec: the cross-section evaluation code

doi:10.1140/epjc/s10052-020-08635-y

Xsec: the cross-section evaluation code

2020-12-02

6

OA

AI

Jeriek Van den Abeele *

V

Vazquez-Holm, Ingrid A.

DOI：10.1140/epjc/s10052-020-08635-y

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Abstract

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The evaluation of higher-order cross-sections is an important component in the search for new physics, both at hadron colliders and elsewhere. For most new physics processes of interest, total cross-sections are known at next-to-leading order (NLO) in the strong coupling alpha s, and often beyond, via either higher-order terms at fixed powers of alpha s, or multi-emission resummation. However, the computation time for such higher-order cross-sections is prohibitively expensive, and precludes efficient evaluation in parameter-space scans beyond two dimensions. Here we describe the software tool xsec, which allows for fast evaluation of cross-sections based on the use of machine-learning regression, using distributed Gaussian processes trained on a pre-generated sample of parameter points. This first version of the code provides all NLO Minimal Supersymmetric Standard Model strong-production cross-sections at the LHC, for individual flavour final states, evaluated in a fraction of a second. Moreover, it calculates regression errors, as well as estimates of errors from higher-order contributions, from uncertainties in the parton distribution functions, and from the value of alpha s. While we focus on a specific phenomenological model of supersymmetry, the method readily generalises to any process where it is possible to generate a sufficient training sample.

Keywords:

GAUGINO-PAIR PRODUCTION

THRESHOLD RESUMMATION

JOINT RESUMMATION

HADRON

SQUARK

Xsec: the cross-section evaluation code

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