Hint for axial-vector contact interactions in the data on $e^{+}e^{-} \to e^{+}e^{-}(\gamma)$ at centre-of-mass energies 192-208 GeV

For the first time the experiments ALEPH, DELPHI, L3 and OPAL have presented preliminary results for fermion-pair production in e+e- collisions on the full data set above the Z pole. A combined analysis of the Bhabha scattering measurements is performed to search for effects of contact interactions....

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Detalles Bibliográficos
Autor principal: Bourilkov, D
Lenguaje:eng
Publicado: 2001
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.64.071701
http://cds.cern.ch/record/496451
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author Bourilkov, D
author_facet Bourilkov, D
author_sort Bourilkov, D
collection CERN
description For the first time the experiments ALEPH, DELPHI, L3 and OPAL have presented preliminary results for fermion-pair production in e+e- collisions on the full data set above the Z pole. A combined analysis of the Bhabha scattering measurements is performed to search for effects of contact interactions. In the case of two axial-vector (AA) currents the best fit to the data is 2.6 standard deviations away from the Standard Model expectation, corresponding to an energy scale $\Lambda = 10.3^{+2.8}_{-1.6}$ TeV for contact interactions. For other models no statistically significant deviations are observed, and the data are used to set lower limits at 95 % confidence level on the contact interaction scales ranging from 8.2 to 21.3 TeV, depending on the helicity structure.
id cern-496451
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2001
record_format invenio
spelling cern-4964512019-09-30T06:29:59Zdoi:10.1103/PhysRevD.64.071701http://cds.cern.ch/record/496451engBourilkov, DHint for axial-vector contact interactions in the data on $e^{+}e^{-} \to e^{+}e^{-}(\gamma)$ at centre-of-mass energies 192-208 GeVParticle Physics - PhenomenologyFor the first time the experiments ALEPH, DELPHI, L3 and OPAL have presented preliminary results for fermion-pair production in e+e- collisions on the full data set above the Z pole. A combined analysis of the Bhabha scattering measurements is performed to search for effects of contact interactions. In the case of two axial-vector (AA) currents the best fit to the data is 2.6 standard deviations away from the Standard Model expectation, corresponding to an energy scale $\Lambda = 10.3^{+2.8}_{-1.6}$ TeV for contact interactions. For other models no statistically significant deviations are observed, and the data are used to set lower limits at 95 % confidence level on the contact interaction scales ranging from 8.2 to 21.3 TeV, depending on the helicity structure.hep-ph/0104165oai:cds.cern.ch:4964512001
spellingShingle Particle Physics - Phenomenology
Bourilkov, D
Hint for axial-vector contact interactions in the data on $e^{+}e^{-} \to e^{+}e^{-}(\gamma)$ at centre-of-mass energies 192-208 GeV
title Hint for axial-vector contact interactions in the data on $e^{+}e^{-} \to e^{+}e^{-}(\gamma)$ at centre-of-mass energies 192-208 GeV
title_full Hint for axial-vector contact interactions in the data on $e^{+}e^{-} \to e^{+}e^{-}(\gamma)$ at centre-of-mass energies 192-208 GeV
title_fullStr Hint for axial-vector contact interactions in the data on $e^{+}e^{-} \to e^{+}e^{-}(\gamma)$ at centre-of-mass energies 192-208 GeV
title_full_unstemmed Hint for axial-vector contact interactions in the data on $e^{+}e^{-} \to e^{+}e^{-}(\gamma)$ at centre-of-mass energies 192-208 GeV
title_short Hint for axial-vector contact interactions in the data on $e^{+}e^{-} \to e^{+}e^{-}(\gamma)$ at centre-of-mass energies 192-208 GeV
title_sort hint for axial-vector contact interactions in the data on $e^{+}e^{-} \to e^{+}e^{-}(\gamma)$ at centre-of-mass energies 192-208 gev
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1103/PhysRevD.64.071701
http://cds.cern.ch/record/496451
work_keys_str_mv AT bourilkovd hintforaxialvectorcontactinteractionsinthedataoneetoeegammaatcentreofmassenergies192208gev

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