Ερευνητικό υλικό ΕΚΠΑ

Energy dependence of event shapes and of alpha(s) at LEP 2

Αγγλικά

Infrared and collinear safe event shape distributions and their mean
values are determined using the data taken at five different centre of
mass energies above M-Z with the DELPHI detector at LEP. From the event
shapes, the strong coupling alpha(s) is extracted in O(alpha(s)(2)),
NLLA and a combined scheme using hadronisation corrections evaluated
with fragmentation model generators as well as using an analytical power
ansatz. Comparing these measurements to those obtained at M-Z, the
energy dependence (running) of alpha(s) is accessible. The logarithmic
energy slope of the inverse strong coupling is measured to be
d alpha(s)(-1)/d log(E-cm) = 1.39 +/- 0.34 (stat) +/- 0.17(syst),
in good agreement with the QCD expectation of 1.27. (C) 1999 Published
by Elsevier Science B.V. All rights reserved.

1999

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Adam, W
Adye, T
Adzic, P
Albrecht, Z and
Alderweireld, T
Alekseev, GD
Alemany, R
Allmendinger, T and
Allport, PP
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DELPHI Collaboration

PHYSICS LETTERS B

ELSEVIER SCIENCE BV

456

2-4

322-340

https://doi.org/10.1016/S0370-2693(99)00472-4

10.1016/S0370-2693(99)00472-4

https://pergamos.lib.uoa.gr/uoa/dl/object/3051908