CERN Accelerating science

Preprint
Report number	CERN-OPEN-99-338
Title	Measurement of fermion pair production in $e^{+}e^{-}$ annihilation and interpretation in terms of new physics phenomena
Author(s)	Minard, M N (CERN)
Publication	1997
Collaboration	ALEPH Collaboration
Imprint	19 Aug 1997
Number of pages	22
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	Preliminary hadronic and leptonic cross sections and leptonic asymmetry measurements made with the ALEPH detector in e+e- collisions at 161 GeV and 172 GeV are reported. The data samples correspond to integrated luminosities of 11.08 pb-1 at 161 GeV and 10.65 pb-1 at 172 GeV. Results are given includingand excluding the radiative gamma Z0 contribution. The measurements agree well with Standard Model expectations. They are interpreted in terms of four fermion contact interactions, with limits upon the energy scale of such processes being derived under various hypotheses. Limits are a placed on the t-channel exchange of new heavy scalar particles, such as leptoquarks or squarks with R-parity violation.
Submitted by	catherine.cart@cern.ch