Power corrections in the dispersive model for a determination of the strong coupling constant from the thrust distribution

In the context of the dispersive model for non-perturbative corrections, we extend the leading renormalon subtraction to NNLO for the thrust distribution in e + e annihilation. Within this framework, using a NNLL+NNLO perturbative description and including bottom-quark mass effects to NLO, we analyse data in the centre-of-mass energy range sqrts=14-206 GeV in view of a simultaneous determination of the strong coupling constant and the non-perturbative parameter � 0. The fits are performed by matching the resummed and fixed-order predictions both in the R and the log-R matching schemes. The final values in the R scheme are �s(MZ) = 0.1131+0.0028 −0.0022, 0(2GeV ) = 0.538+0.102 −0.047. DOI: https://doi.org/10.1140/epjc/s10052-012-2265-x Posted at the Zurich Open Repository and Archive, University of Zurich ZORA URL: https://doi.org/10.5167/uzh-80700 Accepted Version Originally published at: Gehrmann, Thomas; Luisoni, Gionata; Monni, Pier Francesco (2013). Power corrections in the dispersive model for a determination of the strong coupling constant from the thrust distribution. European Physical Journal C Particles and Fields, 73(1):online. DOI: https://doi.org/10.1140/epjc/s10052-012-2265-x ar X iv :1 21 0. 69 45 v2 [ he pph ] 4 D ec 2 01 2 Eur. Phys. J. C manuscript No. (will be inserted by the editor) Power corrections in the dispersive model for a determination of the strong coupling constant from the thrust distribution Thomas Gehrmann, Gionata Luisoni, Pier Francesco Monni Institut für Theoretische Physik, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland Institute for Particle Physics Phenomenology, University of Durham, Science Laboratories, South Rd, Durham DH1 3LE, UK Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 München, Germany Received: date / Accepted: date Abstract In the context of the dispersive model for non-perturbative corrections, we extend the leading renormalon subtraction to NNLO for the thrust distribution in ee annihilation. Within this framework, using a NNLL+NNLO perturbative description and including bottom quark mass effects to NLO, we analyse data in the centre-of-mass energy range √ s = 14 − 206 GeV in view of a simultaneous determination of the strong coupling constant and the non-perturbative parameter α0. The fits are performed by matching the resummed and fixed-order predictions both in the R and the log-R matching schemes. The final values in the R scheme are αs(MZ) = 0.1131 +0.0028 −0.0022, α0(2 GeV) = 0.538 +0.102 −0.047.