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Johan Rathsman. Photo.

Johan Rathsman

Senior lecturer

Johan Rathsman. Photo.

The thrust and heavy-jet mass distributions in the two-jet region

Author

  • Einan Gardi
  • Johan Rathsman

Summary, in English


Dressed Gluon Exponentiation (DGE) is used to calculate the thrust and the heavy-jet mass distributions in e
+
e
-
annihilation in the two-jet region. We perform a detailed analysis of power corrections, taking care of the effect of hadron masses on the measured observables. In DGE the Sudakov exponent is calculated in a renormalization-scale invariant way using renormalon resummation. Neglecting the correlation between the hemispheres in the two-jet region, we express the thrust and the heavy-jet mass distributions in terms of the single-jet mass distribution. This leads to a simple description of the hadronization corrections to both distributions in terms of a single shape function, whose general properties are deduced from renormalon ambiguities. Matching the resummed result with the available next-to-leading order calculation, we get a good description of the thrust distribution in a wide range, whereas the description of the heavy-jet mass distribution, which is more sensitive to the approximation of the phase space, is restricted to the range ρ
H
< 1/6. This significantly limits the possibility to determine α
s
from this observable. However, fixing α
s
by the thrust analysis, we show that the power corrections for the two observables are in good agreement.

Publishing year

2002-08-26

Language

English

Pages

243-287

Publication/Series

Nuclear Physics B

Volume

638

Issue

1-2

Document type

Journal article

Publisher

North-Holland

Topic

  • Subatomic Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 0550-3213