$Z$ Width and Branching Ratios in Extended Gauge Models

Altarelli, Guido; Casalbuoni, R.; Dominici, D.; Feruglio, F.; Gatto, Raoul

doi:10.1142/S0217732390000573

$Z$ Width and Branching Ratios in Extended Gauge Models

Guido Altarelli
(
- CERN
)
,
R. Casalbuoni
(
- Salento U. and
- INFN, Lecce and
- Geneva U.
)
,
D. Dominici
(
- Camerino U. and
- INFN, Florence
)
,
F. Feruglio
(
- Geneva U.
)
,
Raoul Gatto
(
- Geneva U.
)

Dec, 1989

22 pages

Published in:

Mod.Phys.Lett.A 5 (1990) 495

DOI:

10.1142/S0217732390000573

Report number:

CERN-TH-5591/89,
UGVA-DPT-1989/11-642

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Abstract: (WSP)

We study the effects of a possible new heavy neutral vector boson ZH on the partial and total widths of the ZL which are being studied at LEP. The analysis is formulated in as general terms as possible, without commitment to a particular model. The constraints on

m_{Z_H }

from CDF and the new data on {{m_W } \mathord{\left/ {\vphantom {{m_W } {m_{Z_L } }}} \right. \kern-\nulldelimiterspace} {m_{Z_L } }} and

m_{Z_L }

are taken into account. As expected, the induced deviations are at the level of a few per cent. The allowed range decreases with increasing mt. The lepton widths and the peak cross-sections are particularly sensitive. A fourth light neutrino is excluded also in extended gauge models.

electron positron: annihilation
annihilation: electron positron
Z0: electroproduction
electroproduction: Z0
Z0: width
Z0: branching ratio
postulated particle: Z'
effect: Z'
interference: (Z' Z0)
top: mass

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