2010/04/27 by Riccardo Abbate, Abbate, Riccardo, Michael Fickinger +8
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.1004.4894
6 pages, 6 figures, part of RADCOR 2009 proceedings, small correction in figure 2b
openalex publication_date 2010/04/27 · arxiv created 2010/04/30 · arxiv updated 2010/05/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
From soft-collinear effective theory one can derive a factorization formula for the e+e- thrust distribution dsigma/dtau with tau = 1-T that is applicable for all tau. The formula accommodates available O(alphas3) fixed-order QCD results, resummation of logarithms at NNNLL order, a universal nonperturbative soft function for hadronization effects, factorization of nonperturbative effects in subleading power contributions, bottom mass effects and QED corrections. We emphasize that the use of Monte Carlos to estimate hadronization effects is not compatible with high-precision, high-order analyses. We present a global analysis of all available e+e- thrust data measured at Q = 35 to 207 GeV in the tail region, where a two-parameter fit can be carried out for alphas(mZ) and Omega1, the first moment of the soft function. To obtain small theoretical errors it is essential to define Omega1 in a short-distance scheme, free of an O(LambdaQCD) renormalon ambiguity. We find alphas(mZ) = 0.1135 +- (0.0002)expt +- (0.0005)Omega1 +- (0.0009)pert with chi2/dof = 0.9.