An S matrix analysis of the Z resonance

Adriani, O.; Aguilar-Benitez, M.; Ahlen, S.P.; Alcaraz, J.; Aloisio, A.; Alverson, G.; Alviggi, M.G.; Ambrosi, G.; An, Q.; Anderhub, H.

doi:10.1016/0370-2693(93)91646-5

An S matrix analysis of the Z resonance

L3

Collaboration

Aug, 1993

12 pages

Published in:

Phys.Lett.B 315 (1993) 494-502

DOI:

10.1016/0370-2693(93)91646-5

Report number:

CERN-PPE-93-150

Experiments:

CERN-LEP-L3

View in:

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Abstract: (Elsevier)

The S matrix ansatz is a rigorously model independent approach to describe the cross-sections and asymetries in e + e − annihilation. Using the cross-sections and asymetries measured with the L3 detector during the 1990 and 1991 running period, we determine the mass and the width of the Z boson, the contributions of the Z exchange and the γZ interference. Including the polarization of the τ lepton in the analysis, the leptonic helicity amplitudes of the scattering process are determined assuming lepton universality. The results are compared with other model independent ansatzes as realized in ZFITTER. A systematic bias of the Z mass due to the γZ interference term is detected, which leads to an underestimation of the error on m Z for model independent determinations.

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
Z0: electroproduction
electroproduction: Z0
fermion: pair production
pair production: fermion
S-matrix
Z0: mass

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Figures(0)

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