Johan Rathsman
Senior lecturer
The thrust and heavy-jet mass distributions in the two-jet region
Author
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