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

Title: Classically conformal U ( 1 ) ' extended standard model, electroweak vacuum stability, and LHC Run-2 bounds

Abstract

Here, we consider the minimal U(1)' extension of the standard model (SM) with the classically conformal invariance, where an anomaly-free U(1)' gauge symmetry is introduced along with three generations of right-handed neutrinos and a U(1)' Higgs field. Since the classically conformal symmetry forbids all dimensional parameters in the model, the U(1)' gauge symmetry is broken by the Coleman-Weinberg mechanism, generating the mass terms of the U(1)' gauge boson (Z' boson) and the right-handed neutrinos. Through a mixing quartic coupling between the U(1)' Higgs field and the SM Higgs doublet field, the radiative U(1)' gauge symmetry breaking also triggers the breaking of the electroweak symmetry. Furthermore, we first investigate the electroweak vacuum instability problem in the SM, in this model context. Employing the renormalization group equations at the two-loop level and the central values for the world average masses of the top quark (mt=173.34 GeV) and the Higgs boson (mh=125.09 GeV), we perform parameter scans to identify the parameter region for resolving the electroweak vacuum instability problem. We then interpret the recent ATLAS and CMS search limits at the LHC Run-2 for the sequential Z' boson to constrain the parameter region in our model. Combining the constraints from the electroweak vacuummore » stability and the LHC Run-2 results, we find a bound on the Z' boson mass as mZ'≳3.5 TeV. We also calculate self-energy corrections to the SM Higgs doublet field through the heavy states, the right-handed neutrinos and the Z' boson, and find the naturalness bound as mZ'≲7 TeV, in order to reproduce the right electroweak scale for the fine-tuning level better than 10\%. The resultant mass range of 3.5 TeV ≲mZ'≲7 TeV will be explored at the LHC Run-2 in the near future.« less

Authors:
 [1];  [2];  [1];  [2]
  1. Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Physics and Astronomy
  2. Okinawa Inst. of Science and Technology Graduate Univ. (OIST) (Japan); Meio Univ., Okinawa (Japan). Research Inst.
Publication Date:
Research Org.:
Univ. of Alabama, Tuscaloosa, AL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1365627
Alternate Identifier(s):
OSTI ID: 1259905
Grant/Contract Number:  
SC0013680
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 93; Journal Issue: 11; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Das, Arindam, Oda, Satsuki, Okada, Nobuchika, and Takahashi, Dai-suke. Classically conformal U(1)' extended standard model, electroweak vacuum stability, and LHC Run-2 bounds. United States: N. p., 2016. Web. doi:10.1103/PhysRevD.93.115038.
Das, Arindam, Oda, Satsuki, Okada, Nobuchika, & Takahashi, Dai-suke. Classically conformal U(1)' extended standard model, electroweak vacuum stability, and LHC Run-2 bounds. United States. https://doi.org/10.1103/PhysRevD.93.115038
Das, Arindam, Oda, Satsuki, Okada, Nobuchika, and Takahashi, Dai-suke. 2016. "Classically conformal U(1)' extended standard model, electroweak vacuum stability, and LHC Run-2 bounds". United States. https://doi.org/10.1103/PhysRevD.93.115038. https://www.osti.gov/servlets/purl/1365627.
@article{osti_1365627,
title = {Classically conformal U(1)' extended standard model, electroweak vacuum stability, and LHC Run-2 bounds},
author = {Das, Arindam and Oda, Satsuki and Okada, Nobuchika and Takahashi, Dai-suke},
abstractNote = {Here, we consider the minimal U(1)' extension of the standard model (SM) with the classically conformal invariance, where an anomaly-free U(1)' gauge symmetry is introduced along with three generations of right-handed neutrinos and a U(1)' Higgs field. Since the classically conformal symmetry forbids all dimensional parameters in the model, the U(1)' gauge symmetry is broken by the Coleman-Weinberg mechanism, generating the mass terms of the U(1)' gauge boson (Z' boson) and the right-handed neutrinos. Through a mixing quartic coupling between the U(1)' Higgs field and the SM Higgs doublet field, the radiative U(1)' gauge symmetry breaking also triggers the breaking of the electroweak symmetry. Furthermore, we first investigate the electroweak vacuum instability problem in the SM, in this model context. Employing the renormalization group equations at the two-loop level and the central values for the world average masses of the top quark (mt=173.34 GeV) and the Higgs boson (mh=125.09 GeV), we perform parameter scans to identify the parameter region for resolving the electroweak vacuum instability problem. We then interpret the recent ATLAS and CMS search limits at the LHC Run-2 for the sequential Z' boson to constrain the parameter region in our model. Combining the constraints from the electroweak vacuum stability and the LHC Run-2 results, we find a bound on the Z' boson mass as mZ'≳3.5 TeV. We also calculate self-energy corrections to the SM Higgs doublet field through the heavy states, the right-handed neutrinos and the Z' boson, and find the naturalness bound as mZ'≲7 TeV, in order to reproduce the right electroweak scale for the fine-tuning level better than 10\%. The resultant mass range of 3.5 TeV ≲mZ'≲7 TeV will be explored at the LHC Run-2 in the near future.},
doi = {10.1103/PhysRevD.93.115038},
url = {https://www.osti.gov/biblio/1365627}, journal = {Physical Review D},
issn = {2470-0010},
number = 11,
volume = 93,
place = {United States},
year = {Wed Jun 29 00:00:00 EDT 2016},
month = {Wed Jun 29 00:00:00 EDT 2016}
}

Journal Article:

Citation Metrics:
Cited by: 54 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

SARAH   4: A tool for (not only SUSY) model builders
journal, June 2014


Solution to the hierarchy problem from an almost decoupled hidden sector within a classically scale invariant theory
journal, February 2008


Electroweak measurements in electron–positron collisions at W-boson-pair energies at LEP
journal, August 2013


Conformal symmetry and the Standard Model
journal, May 2007


New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
journal, July 2002


SARAH 3.2: Dirac gauginos, UFO output, and more
journal, July 2013


Z gauge bosons at the Fermilab Tevatron
journal, November 2004


Vacuum stability in U ( 1 ) -prime extensions of the Standard Model with TeV scale right handed neutrinos
journal, November 2014


Implications for New Physics from Fine-Tuning Arguments: I. Application to SUSY and Seesaw Cases
journal, November 2004


Higgs mass implications on the stability of the electroweak vacuum
journal, March 2012


Natural electroweak symmetry breaking from scale invariant Higgs mechanism
journal, November 2013


Z B L portal dark matter and LHC Run-2 results
journal, April 2016


Higgs vacuum stability from the dark matter portal
journal, August 2014


Novel effects in electroweak breaking from a hidden sector
journal, October 2007


A new dynamics of electroweak symmetry breaking with classically scale invariance
journal, April 2016


Classically conformal B – L extended Standard Model
journal, June 2009


Bosonic seesaw mechanism in a classically conformal extension of the Standard Model
journal, March 2016


Shadow Higgs boson from a scale-invariant hidden U ( 1 ) s model
journal, June 2007


Search for physics beyond the standard model in dilepton mass spectra in proton-proton collisions at s = 8 $$ \sqrt{s}=8 $$ TeV
journal, April 2015


Radiative Corrections as the Origin of Spontaneous Symmetry Breaking
journal, March 1973


The next-to-minimal Coleman-Weinberg model
journal, June 1996


Heavy Fermions in the Standard Sequential Scheme
journal, April 1979


Nonexotic neutral gauge bosons
journal, August 2003


Neutrinos, axions and conformal symmetry
journal, October 2008


μ→eγ at a rate of one out of 109 muon decays?
journal, April 1977


Scalar dark matter in scale invariant standard model
journal, April 2016


Classically conformal U ( 1 ) extended standard model and Higgs vacuum stability
journal, July 2015


Neutrino Mass and Spontaneous Parity Nonconservation
journal, April 1980


Investigating the near-criticality of the Higgs boson
journal, December 2013


Physical naturalness and dynamical breaking of classical scale invariance
journal, May 2014


Gauge coupling unification in a classically scale invariant model
journal, February 2016


Constraints on abelian extensions of the Standard Model from two-loop vacuum stability and U(1) B−L
journal, February 2016


Electroweak Higgs as a pseudo-Goldstone boson of broken scale invariance
journal, November 2007


Stabilizing the Higgs potential with a Z′
journal, May 2015


Effective action, conformal anomaly and the issue of quadratic divergences
journal, February 2008


Electroweak Measurements in Electron–Positron Collisions at W-Boson-Pair Energies at LEP
text, January 2013


Electroweak Higgs as a pseudo-Goldstone boson of broken scale invariance
text, January 2007


Neutrino mass in radiatively-broken scale-invariant models
text, January 2007


Classically Conformal B-L extended Standard Model
text, January 2009


Radiative Symmetry Breaking of the Minimal Left-Right Symmetric Model
text, January 2009


Electroweak Measurements in Electron-Positron Collisions at W-Boson-Pair Energies at LEP
text, January 2013


Investigating the near-criticality of the Higgs boson
text, January 2013


Higgs vacuum stability from the dark matter portal
text, January 2014


Neutrino Masses and Conformal Electro-Weak Symmetry Breaking
text, January 2014


Stabilizing the Higgs potential with a Z$'$
text, January 2014


Scalar Dark Matter in Scale Invariant Standard Model
text, January 2015


Nonexotic Neutral Gauge Bosons
text, January 2002


Conformal Symmetry and the Standard Model
text, January 2006


Works referencing / citing this record:

Conformal invariance and singlet fermionic dark matter
journal, October 2019


Hunting for heavy composite Majorana neutrinos at the LHC
journal, October 2016


Nonpolynomial Higgs interactions and vacuum stability
journal, January 2019


Phase transition and vacuum stability in the classically conformal B–L model
journal, July 2019