| Preprint | |
| Report number | CERN-OPEN-99-323 |
| Title | QCD studies with $e^+ e^-$ annihilation data from 130 to 172 GeV |
| Author(s) | Cowan, G D ; Gao, Y ; Jones, R ; Stenzel, H |
| Affiliation | (CERN) |
| Publication | 1997 |
| Collaboration | ALEPH Collaboration |
| Imprint | 19 Jul 1997 |
| Number of pages | 28 |
| Presented at | International Europhysics Conference on High-Energy Physics, Jerusalem, Israel, 19 - 25 Aug 1997 |
| Subject category | Particle Physics - Experiment |
| Accelerator/Facility, Experiment | CERN LEP ; ALEPH |
| Keywords | e+ e- |
| Abstract | Hadronic events produced at LEP at centre-of-mass energies of 130, 136, 161 and 172 GeV have been studied and compared with QCD predictions. Distributions of event-shape observables, jet rates, momentum spectra and multiplicities are presented and compared to the predictions of several Monte Carlo models and analytic QCD calculations. From a fit of O(alpha_s^2)+NLLA QCD calculations to the differential two-jet rate, alpha_s has been determined at various energies. The mean charged particle multiplicities and the peak positions xi_star in the xi = ln(1/x_p) distribution have also been determined. These results have been compared to lower energy data and to analytic QCD or Monte Carlo predictions for their energy evolution. |
| Submitted by | catherine.cart@cern.ch |
Record created 1999-11-09, last modified 2014-07-14
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