Testing the running of the QCD coupling in particle energy spectra

Details Testing the running of the QCD coupling in particle energy spectra Testing the running of the QCD coupling in particle energy spectra

1995-09-07

arxiv.org/abs/hep-ph/9509249v1

Phys.Lett. B365 (1996) 339

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages including 3 figures, uuencoded gz-compressed PS-file

Scientific paper

10.1016/0370-2693(95)01270-2

The spectra of charged particles in the energy variable $\xi = \log 1/x$ (``the hump backed plateau'') are analyzed in terms of moments in order to investigate the sensitivity to the running of $\alpha_s$ in particular towards small scales, and to further test thereby the local parton hadron duality picture. The modified leading log approximation (MLLA) of QCD provides a very satisfying description of the $e^+e^-$ data in the full range of c.m. energies from about 1 up to 91 GeV. The same calculation but with fixed coupling $\alpha_s$ yields moments which are inconsistent with the data already close to threshold. In particular the soft particles ($E\le 1$~GeV) reflect directly the running of $\alpha_s$.

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