Lancaster EPrints

Z production cross-sections and lepton pair forward-backward asymmetries

Buskulic, D. and Finch, Alexander (1994) Z production cross-sections and lepton pair forward-backward asymmetries. Zeitschrift für Physik C Particles and Fields, 62 (4). pp. 539-550. ISSN 0170-9739

Full text not available from this repository.

Abstract

Precise values of theZ resonance cross sections and lepton pair forward-backward asymmetries are measured from a sample of 1.3 millionZ decays into hadrons and charged leptons taken with the ALEPH detector at LEP. A silicon-tungsten luminosity calorimeter was installed in ALEPH in 1992, permitting the determination of the absolute luminosity to a systematic precision of 0.15% (experimental) and 0.25% (theoretical). This is combined with a better understanding of the hadronic event selection and an improved tau pair selection. Including the ALEPH results of the past three years one obtains σh0 =(41.60±0.16) nb, andRl=20.69±0.09. The corresponding number of light neutrino species isNv =2.983±0.034. The lepton pair forward-backward asymmetry is used to derive the ratio of vector to axial-vector couplings of leptons:gV2(MZ2)/gA2(MZ2)=0.0058 ±0.0011. An application of these results to constrain one model with extraZ bosons is presented.

Item Type: Article
Journal or Publication Title: Zeitschrift für Physik C Particles and Fields
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 64093
Deposited By: ep_importer_pure
Deposited On: 08 May 2013 16:11
Refereed?: Yes
Published?: Published
Last Modified: 20 Sep 2017 06:28
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/64093

Actions (login required)

View Item