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Matching NLLA+NNLO for event shape distributions


Gehrmann, T; Luisoni, G; Stenzel, H (2008). Matching NLLA+NNLO for event shape distributions. Physics Letters B, 664(4-5):265-273.

Abstract

We study the matching of the next-to-leading logarithmic approximation (NLLA) onto the fixed next-tonext-
to-leading order (NNLO) calculation for event shape distributions in electron–positron annihilation. The resulting theoretical predictions combine all precision QCD knowledge on the distributions, and are theoretically reliable over an extended kinematical range. Compared to previously available matched NLLA + NLO and fixed order NNLO results, we observe that the effects of the combined NLLA + NNLO are small in the three-jet region, relevant for precision physics.

Abstract

We study the matching of the next-to-leading logarithmic approximation (NLLA) onto the fixed next-tonext-
to-leading order (NNLO) calculation for event shape distributions in electron–positron annihilation. The resulting theoretical predictions combine all precision QCD knowledge on the distributions, and are theoretically reliable over an extended kinematical range. Compared to previously available matched NLLA + NLO and fixed order NNLO results, we observe that the effects of the combined NLLA + NNLO are small in the three-jet region, relevant for precision physics.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:June 2008
Deposited On:10 Mar 2009 08:19
Last Modified:05 Apr 2016 13:06
Publisher:Elsevier
ISSN:0370-2693
Publisher DOI:https://doi.org/10.1016/j.physletb.2008.05.023
Related URLs:http://arxiv.org/abs/0803.0695

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