Robust estimates of theoretical uncertainties at fixed-order in perturbation theory

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• Rene Poncelet (Cracow, INP)
• Friday 21 February 2025, 16:00-17:00
• MR19 (Potter Room, Pavilion B), CMS.

If you have a question about this talk, please contact Terry Generet.

Precision computations for standard candle processes are a staple of the physics programme at colliders such as the Large Hadron Collider (LHC). The highest precision can be achieved in perturbative computations. In perturbation theory, however, calculations truncated at a fixed order inevitably have inherent theoretical uncertainty. This uncertainty quantifies the contributions from the missing higher-order terms (MHOU) that have not been accounted for. Traditionally, scale variation has been employed to estimate this uncertainty. In this talk, I introduce a straightforward yet effective prescription to directly incorporate these missing higher-order terms through theory nuisance parameters (TNPs). By varying these parameters, the associated uncertainty can effectively be estimated.

I will elaborate on how this methodology can be applied across various processes pertinent to LHC physics, specifically at next-to-leading (NLO) and next-to-next-to-leading order (NNLO) in perturbation theory. The findings reveal that in scenarios where scale variations yield consistent and reliable results, we can successfully mimic their outcomes using TNPs. Moreover, we will observe a considerable improvement in scenarios where traditional scale variation methods tend to underestimate the uncertainty involved.

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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