NLO+PS pole-mass correspondence
The argument
In generators matched to next-to-leading-order calculations, the top-quark propagator at parton level has its pole at the input mass parameter, so any difference from the pole mass must come from infrared physics below the shower cutoff. Because shower-cutoff and hadronization effects shift the mass parameter only by amounts of order Lambda_QCD, roughly 200 to 300 MeV, and given that the pole mass itself is defined to within a renormalon ambiguity of roughly 110 to 250 MeV, the identification of the two masses at few-hundred-MeV precision follows.
Does it work?
- Does it follow?
- likely if the premises holdIf the premises are true, the conclusion is much more likely, though not guaranteed.constitution →
- Do the premises hold?
- 1 supported1 not separately assessed
Suppose the parton-level pole sits at the input mass and the infrared corrections are of order Lambda_QCD. Then the two masses should agree to within a few hundred MeV, though the size of the corrections is set by estimation rather than derived. The argument depends mainly on the premise that cutoff and hadronization shifts are of order Lambda_QCD, which is currently supported and is the point experts actually dispute. The renormalon ambiguity of the pole mass sets the lowest precision at which the comparison means anything, and its value is not contested.
Premises
- SupportedThe evidence favors the claim, but the examination is incomplete or the evidence is indirect.constitution →Shower-cutoff and hadronization effects shift the NLO+PS top-quark mass parameter only by amounts of order Lambda_QCD
- UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →The top-quark pole mass has an intrinsic renormalon ambiguity of roughly 110 to 250 MeV
Where it is made
Passages where sources make, criticize or mention this argument. They record where it appears, not how strong it is, and none has precedence over another.
No source is recorded as making it.
Earlier ratings
- Jul 19, 2026
The inference is sound: if infrared shifts are of order the QCD scale and the pole mass is defined more finely than that, the identification follows at the stated precision. The argument lives or dies on the premise that shower-cutoff and hadronization effects shift the mass parameter only by order Lambda_QCD, which now stands supported but remains the exact point the skeptical camp disputes, so the argument is a supported line of evidence rather than a settled one. The presupposition of a small pole-mass renormalon ambiguity is quantitatively established in the literature and carries little risk.
- Jul 19, 2026
The inference is sound: if infrared shifts are of order the QCD scale and the pole mass is defined more finely than that, the identification follows at the stated precision. The argument lives or dies on the premise that shower-cutoff and hadronization effects shift the mass parameter only by order Lambda_QCD, which is exactly what the skeptical camp disputes and which remains unassessed; the presupposition of a small pole-mass renormalon ambiguity is quantitatively established and carries little risk.