Abstract
Tests of composite models are performed in e{sup +} e{sup -} collisions in the vicinity of the Z{sup 0} pole using the ALEPH detector. Two kinds of substructure effects are searched for: deviations of differential cross section for reactions e{sup +} e{sup -} {yields} l{sup +} l{sup -} and e{sup +} e{sup -} {yields} {gamma} {gamma} from standard model predictions, and direct search for excited neutrino. A new interaction, parametrized by a 4-fermion contact term, cell, is studied in lepton pair production reactions, assuming different chiralities of the currents. Lower limits on the compositeness scale {Lambda} are obtained by fitting model predictions to the data. They are in the range from 1 to a few TeV depending on model and lepton flavour. Researches for the lightest excited particle that could be the excited neutrino, are presented.
Citation Formats
Badaud, F.
A study of composite models at LEP with ALEPH; Etude de modeles composites au LEP avec ALEPH.
France: N. p.,
1992.
Web.
Badaud, F.
A study of composite models at LEP with ALEPH; Etude de modeles composites au LEP avec ALEPH.
France.
Badaud, F.
1992.
"A study of composite models at LEP with ALEPH; Etude de modeles composites au LEP avec ALEPH."
France.
@misc{etde_10127386,
title = {A study of composite models at LEP with ALEPH; Etude de modeles composites au LEP avec ALEPH}
author = {Badaud, F}
abstractNote = {Tests of composite models are performed in e{sup +} e{sup -} collisions in the vicinity of the Z{sup 0} pole using the ALEPH detector. Two kinds of substructure effects are searched for: deviations of differential cross section for reactions e{sup +} e{sup -} {yields} l{sup +} l{sup -} and e{sup +} e{sup -} {yields} {gamma} {gamma} from standard model predictions, and direct search for excited neutrino. A new interaction, parametrized by a 4-fermion contact term, cell, is studied in lepton pair production reactions, assuming different chiralities of the currents. Lower limits on the compositeness scale {Lambda} are obtained by fitting model predictions to the data. They are in the range from 1 to a few TeV depending on model and lepton flavour. Researches for the lightest excited particle that could be the excited neutrino, are presented.}
place = {France}
year = {1992}
month = {Apr}
}
title = {A study of composite models at LEP with ALEPH; Etude de modeles composites au LEP avec ALEPH}
author = {Badaud, F}
abstractNote = {Tests of composite models are performed in e{sup +} e{sup -} collisions in the vicinity of the Z{sup 0} pole using the ALEPH detector. Two kinds of substructure effects are searched for: deviations of differential cross section for reactions e{sup +} e{sup -} {yields} l{sup +} l{sup -} and e{sup +} e{sup -} {yields} {gamma} {gamma} from standard model predictions, and direct search for excited neutrino. A new interaction, parametrized by a 4-fermion contact term, cell, is studied in lepton pair production reactions, assuming different chiralities of the currents. Lower limits on the compositeness scale {Lambda} are obtained by fitting model predictions to the data. They are in the range from 1 to a few TeV depending on model and lepton flavour. Researches for the lightest excited particle that could be the excited neutrino, are presented.}
place = {France}
year = {1992}
month = {Apr}
}