Study of the muon pair production at center-of-mass energies from 20-GeV to 136-GeV with the ALEPH detector - INSPIRE

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Study of the muon pair production at center-of-mass energies from 20-GeV to 136-GeV with the ALEPH detector

ALEPH

Collaboration

Jan, 1997

18 pages

Published in:

Phys.Lett.B 399 (1997) 329-341

DOI:

10.1016/S0370-2693(97)00353-5

Report number:

CERN-PPE-97-010,
CERN-PPE-97-10,
FSU-SCRI-97-92

Experiments:

CERN-LEP-ALEPH

View in:

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Abstract: (Elsevier)

The total cross section and the forward-backward asymmetry for the process e + e − → μ + μ − ( nγ ) 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 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 σ 0 and A FB 0 from a model independent fit, enabling constraints to be placed on models with extra Z bosons.

electron positron: colliding beams
electron positron: annihilation
muon: pair production
channel cross section
angular distribution: asymmetry
energy dependence
photon: emission
initial-state interaction
electroweak interaction
mass: Z'

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