Resummation of Heavy Jet Mass and Comparison to LEP Data

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Resummation of Heavy Jet Mass and Comparison to LEP Data

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Title: Resummation of Heavy Jet Mass and Comparison to LEP Data
Author: Chen, Yang-Ting; Schwartz, Matthew D

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Citation: Chen, Yang-Ting and Matthew D. Schwartz. 2010. Resummation of heavy jet mass and comparison to LEP data. Journal of High Energy Physics 2010(8): 1-34.
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Abstract: The heavy jet mass distribution in e\(^+\)e\(^−\) collisions is computed to next-to-next-to-next-to leading logarithmic (N\(^3\)LL) 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, α\(_s\)(m\(_Z\) ) = 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 α\(_s\)(m\(_Z\) ) = 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 α\(_s\) 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.
Published Version: doi:10.1007/JHEP08(2010)058
Other Sources: http://arxiv.org/abs/1005.1644
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:8063805

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  • FAS Scholarly Articles [6463]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

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