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If no Higgs then what?

In the absence of a Higgs boson, the perturbative description of the Standard Model ceases to make sense above a TeV. Heavy spin-1 fields coupled to W and Z bosons can extend the validity of the theory up to higher scales. We carefully identify regions of parameter space where a minimal addition - a...

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Autores principales: Falkowski, A., Grojean, C., Kaminska, A., Pokorski, S., Weiler, A.
Lenguaje:eng
Publicado: 2011
Materias:
Acceso en línea:https://dx.doi.org/10.1007/JHEP11(2011)028
http://cds.cern.ch/record/1373366
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author Falkowski, A.
Grojean, C.
Kaminska, A.
Pokorski, S.
Weiler, A.
author_facet Falkowski, A.
Grojean, C.
Kaminska, A.
Pokorski, S.
Weiler, A.
author_sort Falkowski, A.
collection CERN
description In the absence of a Higgs boson, the perturbative description of the Standard Model ceases to make sense above a TeV. Heavy spin-1 fields coupled to W and Z bosons can extend the validity of the theory up to higher scales. We carefully identify regions of parameter space where a minimal addition - a single spin-1 custodial SU(2) triplet resonance - allows one to retain perturbative control in all channels. Elastic scattering of longitudinal W and Z bosons alone seems to permit a very large cut-off beyond the Naive Dimensional Analysis expectation. We find however that including scattering of the spin-1 resonances then leads to an earlier onset of strong coupling. Most importantly for LHC searches, we define a self-consistent set-up with a well-defined range of validity without recourse to unitarization schemes whose physical meaning is obscure. We discuss the LHC phenomenology and the discovery reach for these electroweak resonances and mention the possibility of a nightmare scenario with no Higgs nor resonance within the LHC reach. Finally, we discuss the effects of parity breaking in the heavy resonance sector which reduces the contributions to the S parameter.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2011
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spelling cern-13733662023-03-14T16:48:22Zdoi:10.1007/JHEP11(2011)028http://cds.cern.ch/record/1373366engFalkowski, A.Grojean, C.Kaminska, A.Pokorski, S.Weiler, A.If no Higgs then what?Particle Physics - PhenomenologyIn the absence of a Higgs boson, the perturbative description of the Standard Model ceases to make sense above a TeV. Heavy spin-1 fields coupled to W and Z bosons can extend the validity of the theory up to higher scales. We carefully identify regions of parameter space where a minimal addition - a single spin-1 custodial SU(2) triplet resonance - allows one to retain perturbative control in all channels. Elastic scattering of longitudinal W and Z bosons alone seems to permit a very large cut-off beyond the Naive Dimensional Analysis expectation. We find however that including scattering of the spin-1 resonances then leads to an earlier onset of strong coupling. Most importantly for LHC searches, we define a self-consistent set-up with a well-defined range of validity without recourse to unitarization schemes whose physical meaning is obscure. We discuss the LHC phenomenology and the discovery reach for these electroweak resonances and mention the possibility of a nightmare scenario with no Higgs nor resonance within the LHC reach. Finally, we discuss the effects of parity breaking in the heavy resonance sector which reduces the contributions to the S parameter.In the absence of a Higgs boson, the perturbative description of the Standard Model ceases to make sense above a TeV. Heavy spin-1 fields coupled to W and Z bosons can extend the validity of the theory up to higher scales. We carefully identify regions of parameter space where a minimal addition - a single spin-1 custodial SU(2) triplet resonance - allows one to retain perturbative control in all channels. Elastic scattering of longitudinal W and Z bosons alone seems to permit a very large cut-off beyond the Naive Dimensional Analysis expectation. We find however that including scattering of the spin-1 resonances then leads to an earlier onset of strong coupling. Most importantly for LHC searches, we define a self-consistent set-up with a well-defined range of validity without recourse to unitarization schemes whose physical meaning is obscure. We discuss the LHC phenomenology and the discovery reach for these electroweak resonances and mention the possibility of a nightmare scenario with no Higgs nor resonance within the LHC reach. Finally, we discuss the effects of parity breaking in the heavy resonance sector which reduces the contributions to the S parameter.arXiv:1108.1183DESY-11-132CERN-PH-TH-2011-185LPT-ORSAY-11-666CERN-PH-TH-2011-185oai:cds.cern.ch:13733662011-08-05
spellingShingle Particle Physics - Phenomenology
Falkowski, A.
Grojean, C.
Kaminska, A.
Pokorski, S.
Weiler, A.
If no Higgs then what?
title If no Higgs then what?
title_full If no Higgs then what?
title_fullStr If no Higgs then what?
title_full_unstemmed If no Higgs then what?
title_short If no Higgs then what?
title_sort if no higgs then what?
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1007/JHEP11(2011)028
http://cds.cern.ch/record/1373366
work_keys_str_mv AT falkowskia ifnohiggsthenwhat
AT grojeanc ifnohiggsthenwhat
AT kaminskaa ifnohiggsthenwhat
AT pokorskis ifnohiggsthenwhat
AT weilera ifnohiggsthenwhat