Resummation of heavy jet mass and comparison to LEP data
From MaRDI portal
Publication:2248145
DOI10.1007/JHEP08(2010)058zbMATH Open1291.81385arXiv1005.1644MaRDI QIDQ2248145
Author name not available (Why is that?)
Publication date: 30 June 2014
Published in: (Search for Journal in Brave)
Abstract: The heavy jet mass distribution in e+e- collisions is computed to next-to-next-to-next-to leading logarithmic (NNNLL) 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 alpha_s is extracted, alpha_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 alpha_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 alpha_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.
Full work available at URL: https://arxiv.org/abs/1005.1644
No records found.
No records found.
This page was built for publication: Resummation of heavy jet mass and comparison to LEP data
Report a bug (only for logged in users!)Click here to report a bug for this page (MaRDI item Q2248145)
