skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: CERN LEP indications for two light Higgs bosons and the U(1){sup '} model

Abstract

Reanalyses of LEP data have shown preference to two light CP-even Higgs bosons. We discuss implications of such a Higgs boson spectrum for the minimal supersymmetric model extended by a standard model singlet chiral superfield and an additional Abelian gauge invariance [the U(1){sup '} model]. We, in particular, determine parameter regions that lead to two light CP-even Higgs bosons while satisfying existing bounds on the mass and mixings of the extra vector boson. In these parameter regions, the pseudoscalar Higgs is found to be nearly degenerate in mass with either the lightest or next-to-lightest Higgs boson. Certain parameters of the U(1){sup '} model such as the effective {mu} parameter are found to be significantly bounded by the LEP two light Higgs signal.

Authors:
 [1];  [1];  [2];  [3]
  1. Department of Physics, Izmir Institute of Technology, IZTECH, TR35430 (Turkey)
  2. (Turkey)
  3. Department of Physics, Balikesir University, Balikesir, TR10100 (Turkey)
Publication Date:
OSTI Identifier:
20774643
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 73; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevD.73.016001; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CHIRAL SYMMETRY; CHIRALITY; CP INVARIANCE; ENERGY SPECTRA; GAUGE INVARIANCE; HIGGS BOSONS; HIGGS MODEL; LEP STORAGE RINGS; PARTICLE IDENTIFICATION; REST MASS; STANDARD MODEL; SUPERSYMMETRY; UNITARY SYMMETRY

Citation Formats

Demir, Durmus A., Solmaz, Levent, Department of Physics, Balikesir University, Balikesir, TR10100, and Solmaz, Saime. CERN LEP indications for two light Higgs bosons and the U(1){sup '} model. United States: N. p., 2006. Web. doi:10.1103/PhysRevD.73.016001.
Demir, Durmus A., Solmaz, Levent, Department of Physics, Balikesir University, Balikesir, TR10100, & Solmaz, Saime. CERN LEP indications for two light Higgs bosons and the U(1){sup '} model. United States. doi:10.1103/PhysRevD.73.016001.
Demir, Durmus A., Solmaz, Levent, Department of Physics, Balikesir University, Balikesir, TR10100, and Solmaz, Saime. Sun . "CERN LEP indications for two light Higgs bosons and the U(1){sup '} model". United States. doi:10.1103/PhysRevD.73.016001.
@article{osti_20774643,
title = {CERN LEP indications for two light Higgs bosons and the U(1){sup '} model},
author = {Demir, Durmus A. and Solmaz, Levent and Department of Physics, Balikesir University, Balikesir, TR10100 and Solmaz, Saime},
abstractNote = {Reanalyses of LEP data have shown preference to two light CP-even Higgs bosons. We discuss implications of such a Higgs boson spectrum for the minimal supersymmetric model extended by a standard model singlet chiral superfield and an additional Abelian gauge invariance [the U(1){sup '} model]. We, in particular, determine parameter regions that lead to two light CP-even Higgs bosons while satisfying existing bounds on the mass and mixings of the extra vector boson. In these parameter regions, the pseudoscalar Higgs is found to be nearly degenerate in mass with either the lightest or next-to-lightest Higgs boson. Certain parameters of the U(1){sup '} model such as the effective {mu} parameter are found to be significantly bounded by the LEP two light Higgs signal.},
doi = {10.1103/PhysRevD.73.016001},
journal = {Physical Review. D, Particles Fields},
number = 1,
volume = 73,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}
  • We study the scalar Higgs sector of the next-to-minimal supersymmetric standard model with an extra U(1), which has two Higgs doublets and a Higgs singlet, in the light leptophobic Z{sup '} scenario where the extra neutral gauge boson Z{sup '} does not couple to charged leptons. In this model, we find that the sum of the squared coupling coefficients of the three neutral scalar Higgs bosons to ZZ, normalized by the corresponding standard model coupling coefficient, is noticeably smaller than unity, due to the effect of the extra U(1), for a reasonable parameter space of the model, whereas it ismore » unity in the next-to-minimal supersymmetric standard model. Thus, these two models may be distinguished if the coupling coefficients of neutral scalar Higgs bosons to ZZ are measured at the future International Linear Collider by producing them via the Higgs-strahlung, ZZ fusion, and WW fusion processes.« less
  • We discuss the discovery reach of CERN LEP 2 for the Higgs sector of a general extension of the MSSM including a single gauge singlet field. This change introduces a new quartic Higgs boson self-coupling which can increase the masses of the {ital CP}-even states, and also allows mixing between singlet and nonsinglet states which can reduce the couplings of the mass eigenstates to the {ital Z}. The lightest {ital CP}-even Higgs boson is bounded by a parameter {Lambda} which takes a maximum value {Lambda}{sub max}{approx_equal} 136{endash}146 GeV for a top quark mass of 150{endash}195 GeV. We generalize the discussionmore » of the bound to include the entire {ital CP}-even spectrum and show how experiment may exclude values of {Lambda} smaller than some {Lambda}{sub min}. {ital CP}-even Higgs boson searches at LEP 2 will be able to exclude {Lambda}{sub min}{approx_equal} 81{endash}105 GeV, depending on the machine parameters. We also present exclusion plots in the {ital m}{sub {ital A}}-tan{beta} plane, based on an analysis of {ital CP}-even, {ital CP}-odd, and charged Higgs boson production processes at LEP 2. {copyright} {ital 1996 The American Physical Society.}« less
  • We study the potential of CERN LEP II to unravel the existence of invisibly decaying Higgs bosons, predicted in a wide class of models. We perform a model-independent analysis, focusing our attention on the final state topologies exhibiting b{bar b} or scr(l){sup +}scr(l){sup {minus}} (scr(l)={mu} or e) pairs and missing energy. We carefully evaluate the signals and backgrounds, choosing appropriate cuts to enhance the discovery limits. Our results demonstrate that LEP II is capable of discovering such a Higgs boson for a wide range of masses and couplings. {copyright} {ital 1997} {ital The American Physical Society}
  • We study the discovery potential of the CERN LHC, Fermilab Tevatron and CERN LEP colliders in the search for the neutral CP-even Higgs boson of the MSSM which couples to the weak gauge bosons with a strength close to the standard model one and, hence, plays a relevant role in the mechanism of electroweak symmetry breaking. We place special emphasis on the radiative effects which influence the discovery reach of these colliders. We concentrate on the Vbb(bar sign) channel, with V=Z or W, and on the channels with diphoton final states, which are the dominant ones for the search formore » a light standard model Higgs boson at LEP or Tevatron and LHC, respectively. By analyzing the parameters of the MSSM for which the searches become difficult at one or more of these three colliders, we demonstrate their complementarity in the search for a light Higgs boson which plays a relevant role in the mechanism of electroweak symmetry breaking. (c) 2000 The American Physical Society.« less
  • We perform a study of the charged Higgs production from an SU(3){sub C} x SU(3){sub L} x U(1){sub X} model with right-handed neutrinos, postulating a custodial symmetry which reduces the number of free parameters in the scalar potential. We compute the cross sections for charged scalars for typical and new production modes. One of the new SU(3){sub L} neutral gauge bosons, Z', affects some production cross sections distinguishing the model from other standard model extensions like, for example, the minimal supersymmetric standard model and general two-Higgs doublets models. The interplay between the Higgs sector of the model and that Z'more » gauge boson enhances substantially all the production rates of the lightest charged Higgs boson, H{sub 1}{sup {+-}}, at hadron colliders compared to the MSSM. We found that a large portion of the parameters space can be probed at the LHC running at 14 TeV center-of-mass energy in the associated pp{yields}W{sup {+-}H}{sub 1}{sup {+-}+}X production channel in the low luminosity run stage of the experiment.« less