Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-07-31
Nucl.Phys. B511 (1998) 396-418; Erratum-ibid. B593 (2001) 729-730
Physics
High Energy Physics
High Energy Physics - Phenomenology
21 pages, no figures, LaTeX. This revised version corrects a mistake in the calculation of the two-loop correction factor. The
Scientific paper
10.1016/S0550-3213(97)00650-0
We address the problem of potential non-universality of the leading 1/Q power corrections to jet shapes emerging from the non-inclusive character of these observables. We consider the thrust distribution as an example and analyse the non-inclusive contributions which emerge at the two-loop level. Although formally subleading in $\as$, they modify the existing na{\"\i}ve one-loop result for the expected magnitude of the power term by a factor of order unity. Such a promotion of a subleading correction into a numerical factor is natural since the non-perturbative power terms are explicitly proportional to powers of the QCD scale $\Lambda$ which can be fixed precisely only at the two-loop level. The ``jet-shape scaling factor'' depends on the observable but remains perturbatively calculable. Therefore it does not undermine the universal nature of 1/Q power corrections, which remain expressible in terms of the universal running coupling and universal soft-gluon emission.
Dokshitzer Yu. L.
Lucenti A.
Marchesini Giuseppe
Salam Gavin P.
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