# Study of muon-pair production at centre-of-mass energies from 20 to 136 GeV with the Aleph detector

Abstract : The total cross section and the forward-backward asymmetry for the process $e^+ e^- \rightarrow \mu^+ \mu^- (n \gamma)$ are measured in the energy range 20-136 GeV by reconstructing the effective centre-of-mass energy after initial state radiation. The analysis is based on the data recorded with the ALEPH detector at LEP between 1990 and 1995, corresponding to a total integrated luminosity of 143.5 $\mathrm{pb}^{-1}$. Two different approaches are used: in the first one an exclusive selection of events with hard initial state radiation in the energy range 20-88 GeV is directly compared with the Standard Model predictions showing good agreement. In the second one, all events are used to obtain a precise measurement of the energy dependence of $\sigma^0$ and $A_{\mathrm{FB}}^0$ from a model independent fit, enabling constraints to be placed on models with extra Z bosons.
Document type :
Journal articles

Cited literature [10 references]

http://hal.in2p3.fr/in2p3-00010782
Contributor : Hélène Kerec Connect in order to contact the contributor
Submitted on : Friday, March 12, 1999 - 11:55:36 AM
Last modification on : Tuesday, April 20, 2021 - 12:00:05 PM
Long-term archiving on: : Tuesday, June 2, 2015 - 12:12:42 PM

### Identifiers

• HAL Id : in2p3-00010782, version 1

### Citation

D. Decamp, P. Ghez, C. Goy, J.P. Lees, A. Lucotte, et al.. Study of muon-pair production at centre-of-mass energies from 20 to 136 GeV with the Aleph detector. Physics Letters B, Elsevier, 1997, 399, pp.329-341. ⟨in2p3-00010782⟩

Record views