argumentA line of reasoning from premises to a conclusion. Like a claim, it belongs to no one who makes it.constitution →

Quantitative infrared-sensitivity studies

forThis argument, if it holds, bears in favour of the claim.constitution →Shower-cutoff and hadronization effects shift the NLO+PS top-quark mass parameter only by amounts of order Lambda_QCD

The argument

Because linked claim and linked claim, the two dominant infrared effects on the generator mass parameter are each quantified at the few-hundred-MeV scale, so their combined shift is of order Lambda_QCD. Comparisons of NLO+PS generators of increasing accuracy point the same way, finding that variations of the shower, matching, and hadronization model move the mass extracted from the reconstructed top peak by at most a few hundred MeV.

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 verified

If its premises hold, the claim becomes much more likely: if the dominant infrared effects are each quantified at a few hundred MeV and the generator mass calibrates to a short-distance mass within about 200 MeV, the combined shift is of order Lambda_QCD. The inference stops short of certain because calibration in e+e- conditions has to be carried over to hadron-collider extractions, and because effects outside the models are not bounded. The argument rests chiefly on the calibration finding, now verified across three generators, and secondarily on the shower-cutoff analysis, which is supported but derived only for angular-ordered showers.

Premises

VerifiedThe evidence, examined directly, establishes the claim.constitution →Calibration studies find the Monte Carlo top-quark mass agrees with the MSR mass at 1 GeV within about 200 MeV
SupportedThe evidence favors the claim, but the examination is incomplete or the evidence is indirect.constitution →The parton-shower infrared cutoff makes the generator top-quark mass a short-distance mass differing from the pole mass by roughly half a GeV

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 31, 2026
The inference goes through provided the two quantified effects are the dominant infrared influences on the generator mass parameter, an assumption the generator-comparison studies corroborate for the reconstructed-peak extraction but do not prove in general. Its first anchor, the half-GeV shower-cutoff shift, is now contested, but the contest runs between values that all sit at the few-hundred-MeV scale and concerns scheme, direction, and applicability to pT-ordered dipole showers, so it narrows the anchor's scope without undermining the order-of-magnitude conclusion the argument needs. The second anchor, the 200-MeV agreement with the MSR mass, remains consistent with the primary literature but unassessed, and was obtained in e+e- rather than hadron-collider conditions; if it failed, the argument would lose its sharpest quantitative support.
Jul 19, 2026
The inference goes through provided the two quantified effects are the dominant infrared influences on the generator mass parameter, an assumption the generator-comparison studies corroborate for the reconstructed-peak extraction but do not prove in general. The argument rests on the half-GeV shower-cutoff shift and the 200-MeV agreement with the MSR mass, both consistent with the primary literature but not yet independently assessed; the calibration result was moreover obtained in e+e- simulations rather than hadron-collider conditions. If either premise failed, the argument would lose its quantitative anchor.