Quick Search:

uzh logo
Browse by:

Zurich Open Repository and Archive

Maintenance: Tuesday, July the 26th 2016, 07:00-10:00

ZORA's new graphical user interface will be relaunched (For further infos watch out slideshow ZORA: Neues Look & Feel). There will be short interrupts on ZORA Service between 07:00am and 10:00 am. Please be patient.

Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-30917

Dissertori, G; Gehrmann-De Ridder, A; Gehrmann, T; Glover, E; Heinrich, G; Luisoni, G; Stenzel, H (2009). Determination of the strong coupling constant using matched NNLO+NLLA predictions for hadronic event shapes in e+e− annihilations. Journal of High Energy Physics, (8):036.

[img] PDF (Verlags-PDF) - Registered users only
View at publisher
Accepted Version


We present a determination of the strong coupling constant from a fit of QCD predictions for six event-shape variables, calculated at next-to-next-to-leading order (NNLO) and matched to resummation in the next-to-leading-logarithmic approximation (NLLA). These event shapes have been measured in e+e− annihilations at LEP, where the data we use have been collected by the ALEPH detector at centre-of-mass energies between 91 and 206 GeV. Compared to purely fixed order NNLO fits, we observe that the central fit values are hardly affected, but the systematic uncertainty is larger because the NLLA part re-introduces relatively large uncertainties from scale variations. By combining the results for six event-shape variables and eight centre-of-mass energies, we find αs(MZ) = 0.1224 ± 0.0009 (stat) ± 0.0009 (exp) ± 0.0012 (had) ± 0.0035 (theo), which improves previously published measurements at NLO+NLLA. We also carry out a detailed investigation of hadronisation corrections, using a large set of Monte Carlo generator predictions.


24 citations in Web of Science®
25 citations in Scopus®
Google Scholar™



35 downloads since deposited on 22 Feb 2010
9 downloads since 12 months

Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Uncontrolled Keywords:Jets; LEP HERA and SLC Physics; NLO Computations; QCD
Deposited On:22 Feb 2010 11:48
Last Modified:05 Apr 2016 13:56
Publisher:Institute of Physics Publishing
Publisher DOI:10.1088/1126-6708/2009/08/036
Related URLs:http://arxiv.org/abs/0906.3436

Users (please log in): suggest update or correction for this item

Repository Staff Only: item control page