Cargando…

Buried Higgs boson

We present an extension of the MSSM where the dominant decay channel of the Higgs boson is a cascade decay into a four-gluon final state. In this model the Higgs is a pseudo-Goldstone boson of a broken global symmetry SU(3)-> SU(2). Both the global symmetry breaking and electroweak symmetry break...

Descripción completa

Detalles Bibliográficos
Autores principales: Bellazzini, Brando, Csaki, Csaba, Falkowski, Adam, Weiler, Andreas
Lenguaje:eng
Publicado: 2009
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.80.075008
http://cds.cern.ch/record/1184496
_version_ 1780916415387140096
author Bellazzini, Brando
Csaki, Csaba
Falkowski, Adam
Weiler, Andreas
author_facet Bellazzini, Brando
Csaki, Csaba
Falkowski, Adam
Weiler, Andreas
author_sort Bellazzini, Brando
collection CERN
description We present an extension of the MSSM where the dominant decay channel of the Higgs boson is a cascade decay into a four-gluon final state. In this model the Higgs is a pseudo-Goldstone boson of a broken global symmetry SU(3)-> SU(2). Both the global symmetry breaking and electroweak symmetry breaking are radiatively induced. The global symmetry breaking pattern also implies the existence of a light (few GeV) pseudo-Goldstone boson eta which is a singlet under the standard model gauge group. The h -> eta eta branching fraction is large, and typically dominates over the standard h -> b b decay. The dominant decay of eta is into two gluons, while the decays to photons, taus or lighter standard model flavors are suppressed at the level of 10^(-4) or more. With h-> 4 jets as the dominant decay, the Higgs could be as light as 78 GeV without being detected at LEP, while detection at the LHC is extremely challenging. However many of the super- and global symmetry partners of the standard model particles should be easily observable at the LHC. Furthermore, the LHC should be able to observe a "wrong Higgs" that is a 300-400 GeV heavy Higgs-like particle with suppressed couplings to W and Z that by itself does not account for electroweak precision observables and the unitarity of WW scattering. At the same time, the true Higgs is deeply buried in the QCD background.
id cern-1184496
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2009
record_format invenio
spelling cern-11844962023-02-01T03:48:53Zdoi:10.1103/PhysRevD.80.075008http://cds.cern.ch/record/1184496engBellazzini, BrandoCsaki, CsabaFalkowski, AdamWeiler, AndreasBuried Higgs bosonParticle Physics - PhenomenologyWe present an extension of the MSSM where the dominant decay channel of the Higgs boson is a cascade decay into a four-gluon final state. In this model the Higgs is a pseudo-Goldstone boson of a broken global symmetry SU(3)-> SU(2). Both the global symmetry breaking and electroweak symmetry breaking are radiatively induced. The global symmetry breaking pattern also implies the existence of a light (few GeV) pseudo-Goldstone boson eta which is a singlet under the standard model gauge group. The h -> eta eta branching fraction is large, and typically dominates over the standard h -> b b decay. The dominant decay of eta is into two gluons, while the decays to photons, taus or lighter standard model flavors are suppressed at the level of 10^(-4) or more. With h-> 4 jets as the dominant decay, the Higgs could be as light as 78 GeV without being detected at LEP, while detection at the LHC is extremely challenging. However many of the super- and global symmetry partners of the standard model particles should be easily observable at the LHC. Furthermore, the LHC should be able to observe a "wrong Higgs" that is a 300-400 GeV heavy Higgs-like particle with suppressed couplings to W and Z that by itself does not account for electroweak precision observables and the unitarity of WW scattering. At the same time, the true Higgs is deeply buried in the QCD background.We present an extension of the MSSM where the dominant decay channel of the Higgs boson is a cascade decay into a four-gluon final state. In this model the Higgs is a pseudo-Goldstone boson of a broken global symmetry SU(3)-> SU(2). Both the global symmetry breaking and electroweak symmetry breaking are radiatively induced. The global symmetry breaking pattern also implies the existence of a light (few GeV) pseudo-Goldstone boson eta which is a singlet under the standard model gauge group. The h -> eta eta branching fraction is large, and typically dominates over the standard h -> b b decay. The dominant decay of eta is into two gluons, while the decays to photons, taus or lighter standard model flavors are suppressed at the level of 10^(-4) or more. With h-> 4 jets as the dominant decay, the Higgs could be as light as 78 GeV without being detected at LEP, while detection at the LHC is extremely challenging. However many of the super- and global symmetry partners of the standard model particles should be easily observable at the LHC. Furthermore, the LHC should be able to observe a 'wrong Higgs' that is a 300-400 GeV heavy Higgs-like particle with suppressed couplings to W and Z that by itself does not account for electroweak precision observables and the unitarity of WW scattering. At the same time, the true Higgs is deeply buried in the QCD background.arXiv:0906.3026CERN-PH-TH-2009-096RUNHETC-2009-07CERN-PH-TH-2009-096RUNHETC 2009-07oai:cds.cern.ch:11844962009-06-18
spellingShingle Particle Physics - Phenomenology
Bellazzini, Brando
Csaki, Csaba
Falkowski, Adam
Weiler, Andreas
Buried Higgs boson
title Buried Higgs boson
title_full Buried Higgs boson
title_fullStr Buried Higgs boson
title_full_unstemmed Buried Higgs boson
title_short Buried Higgs boson
title_sort buried higgs boson
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1103/PhysRevD.80.075008
http://cds.cern.ch/record/1184496
work_keys_str_mv AT bellazzinibrando buriedhiggsboson
AT csakicsaba buriedhiggsboson
AT falkowskiadam buriedhiggsboson
AT weilerandreas buriedhiggsboson