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SUMMARY:Robust estimates of theoretical uncertainties at fixed-order in pe
 rturbation theory - Rene Poncelet (Cracow\, INP)
DTSTART:20250221T160000Z
DTEND:20250221T170000Z
UID:TALK227701@talks.cam.ac.uk
CONTACT:Terry Generet
DESCRIPTION:Precision computations for standard candle processes are a sta
 ple of the physics programme at colliders such as the Large Hadron Collide
 r (LHC). The highest precision can be achieved in perturbative computation
 s. In perturbation theory\, however\, calculations truncated at a fixed or
 der inevitably have inherent theoretical uncertainty. This uncertainty qua
 ntifies the contributions from the missing higher-order terms (MHOU) that 
 have not been accounted for. Traditionally\, scale variation has been empl
 oyed to estimate this uncertainty. In this talk\, I introduce a straightfo
 rward yet effective prescription to directly incorporate these missing hig
 her-order terms through theory nuisance parameters (TNPs). By varying thes
 e parameters\, the associated uncertainty can effectively be estimated.\n\
 nI will elaborate on how this methodology can be applied across various pr
 ocesses pertinent to LHC physics\, specifically at next-to-leading (NLO) a
 nd next-to-next-to-leading order (NNLO) in perturbation theory. The findin
 gs reveal that in scenarios where scale variations yield consistent and re
 liable results\, we can successfully mimic their outcomes using TNPs. More
 over\, we will observe a considerable improvement in scenarios where tradi
 tional scale variation methods tend to underestimate the uncertainty invol
 ved.
LOCATION:MR19 (Potter Room\, Pavilion B)\, CMS
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