NEW RESULTS FROM ALEPH IN E(-)-ANNIHILATIONS AT ROOT-S=161-172-GEV()E()

Authors
Citation
P. Azzurri, NEW RESULTS FROM ALEPH IN E(-)-ANNIHILATIONS AT ROOT-S=161-172-GEV()E(), ACT PHY P B, 28(6), 1997, pp. 1303-1326
Citations number
55
Categorie Soggetti
Physics
Journal title
ACTA PHYSICA POLONICA B
ISSN journal
05874254 → ACNP
Volume
28
Issue
6
Year of publication
1997
Pages
1303 - 1326
Database
ISI
SICI code
0587-4254(1997)28:6<1303:NRFAIE>2.0.ZU;2-P
Abstract
After the energy upgrade of CERN's LEP electron-positron collider, an integrated luminosity of 22 pb(-1) has been collected by the ALEPH exp eriment during the 1996 data taking period, with a centre-of-mass ener gy of 161 and 172 GeV. With this data, new studies of the standard ele ctroweak theory and of quantum chromodynamics observables are presente d and, most notably, precision measurements of m(W) are obtained from the first observation of W pair decays. No evidence of Higgs boson pro duction, nor any signal of supersymmetry or other new physics has been found in the data so that limits are derived, in the framework of the SM and of its minimal supersymmetric extension. The anomalous four je t production excess that was reported at lower centre-of-mass energies of 130-136 GeV is partially confirmed with the new datal though the o rigin of such excess in not yet well understood and necessitates furth er studies. All the presented ALEPH results are preliminary and subjec t to modifications.