Power Corrections to Event Shape Distributions

Details Power Corrections to Event Shape Distributions Power Corrections to Event Shape Distributions

1997-04-11

arxiv.org/abs/hep-ph/9704298v2

Phys.Lett. B404 (1997) 321-327

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, LaTeX, 2 figures; further reference to related work by Korchemsky and Sterman added 30/4/97

Scientific paper

10.1016/S0370-2693(97)00573-X

We estimate the effects of non-perturbative physics on the differential distributions of infrared- and collinear-safe $e^+e^-$ event shape variables, by extending the notion of an infrared-regular effective strong coupling, which accounts for the non-perturbative corrections to the mean values of several shape variables, to their distributions. This leads to $1/Q$ power corrections over a range of values of the shape variables considered, where $Q$ is the centre-of-mass energy. In the case of the thrust variable, the leading correction is simply a shift of the distribution, by an amount proportional to $1/Q$. We show that this gives an excellent description of the data throughout a wide range of $T$ and $Q$.

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