Resummation of heavy jet mass and comparison to LEP data
By Y. Chien, M. Schwartz. 2010
132 citations recorded by the source corpus.
The heavy jet mass distribution in e+e− collisions is computed to next-to-nextto-next-to leading logarithmic (N3LL) and next-to-next-to leading fixed order accuracy (NNLO). The singular terms predicted from the resummed distribution are confirmed by the fixed order distributions allowing a precise extraction of the unknown soft function coefficients. A number of quantitative and qualitative comparisons of heavy jet mass and the related thrust distribution are made. From fitting to ALEPH data, a value of αs is extracted, αs(mZ) = 0.1220 ± 0.0031, which is larger than, but not in conflict with, the corresponding value for thrust. A weighted average of the two produces αs(mZ) = 0.1193 ± 0.0027, consistent with the world average. A study of the non-perturbative corrections shows that the flat direction observed for thrust between αs and a simple non-perturbative shape parameter is not lifted in combining with heavy jet mass. The Monte Carlo treatment of hadronization gives qualitatively different results for thrust and heavy jet mass, and we conclude that it cannot be trusted to add power corrections to the event shape distributions at this accuracy. Whether a more sophisticated effective field theory approach to power corrections can reconcile the thrust and heavy jet mass distributions remains an open question.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/5f08b9226069bbd0aa7c891a88c7c0c69756811b
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In Nuclear and High Energy Physics
Citations in the corpus
- Jet substructure at the Large Hadron Collider: A review of recent advances in theory and machine learning (2017, methodology): “With the scaling log(pTJ/mJ) ∼ 1/αs, we have that the resummed expansions include all terms at the follow- 5 ing orders LL : O(α−1s ) NLL : O(1) NNLL : O(αs) NNNLL : O(α2s) (5) Therefore, a LL calculation includes only the most singular terms, namely all terms that scale as O(α−1s ).”
- Combining higher-order resummation with multiple NLO calculations and parton showers in GENEVA (2012, unknown): “Finally, for heavy jet mass, N(3)LLρ resummed results exist [51]; however, we show the NNLLρ+NLO3 resummation since this is consistent with the highest T2 resummation we use.”
- Power counting to better jet observables (2014, background): “Perturbative predictions of distributions have traditionally been constrained to only the simplest observables, such as the jet mass [35–39], but to high accuracy.”
- Introduction to Soft-Collinear Effective Theory (2014, background): “One such example is the heavy jet mass, which was evaluated in [231] to N3LL accuracy.”
- Factorization for groomed jet substructure beyond the next-to-leading logarithm (2016, background): “[82], in the context of CF channel extractions from EVENT2, and to resolve it might require significantly longer run times.”
- Two-loop soft corrections and resummation of the thrust distribution in the dijet region (2011, methodology): “We analytically derived the two-loop corrections to the soft subprocess for thrust, for which only two numerical results [61, 70] fitted to the subtracted fixed-order expressions were available previously.”