Classically conformal ${\mathrm{U}\left(1\right)}^{\text{'}}$ extended standard model, electroweak vacuum stability, and LHC Run2 bounds
Abstract
Here, we consider the minimal U(1)' extension of the standard model (SM) with the classically conformal invariance, where an anomalyfree U(1)' gauge symmetry is introduced along with three generations of righthanded 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 ColemanWeinberg mechanism, generating the mass terms of the U(1)' gauge boson (Z' boson) and the righthanded 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 twoloop level and the central values for the world average masses of the top quark (m _{t}=173.34 GeV) and the Higgs boson (m _{h}=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 Run2 for the sequential Z' boson to constrain the parameter region in our model. Combining the constraints from themore »
 Authors:

 Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Physics and Astronomy
 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 24700010
 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, Daisuke. Classically conformal U(1)' extended standard model, electroweak vacuum stability, and LHC Run2 bounds. United States: N. p., 2016.
Web. doi:10.1103/PhysRevD.93.115038.
Das, Arindam, Oda, Satsuki, Okada, Nobuchika, & Takahashi, Daisuke. Classically conformal U(1)' extended standard model, electroweak vacuum stability, and LHC Run2 bounds. United States. doi:10.1103/PhysRevD.93.115038.
Das, Arindam, Oda, Satsuki, Okada, Nobuchika, and Takahashi, Daisuke. Wed .
"Classically conformal U(1)' extended standard model, electroweak vacuum stability, and LHC Run2 bounds". United States. doi: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 Run2 bounds},
author = {Das, Arindam and Oda, Satsuki and Okada, Nobuchika and Takahashi, Daisuke},
abstractNote = {Here, we consider the minimal U(1)' extension of the standard model (SM) with the classically conformal invariance, where an anomalyfree U(1)' gauge symmetry is introduced along with three generations of righthanded 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 ColemanWeinberg mechanism, generating the mass terms of the U(1)' gauge boson (Z' boson) and the righthanded 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 twoloop 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 Run2 for the sequential Z' boson to constrain the parameter region in our model. Combining the constraints from the electroweak vacuum stability and the LHC Run2 results, we find a bound on the Z' boson mass as mZ'≳3.5 TeV. We also calculate selfenergy corrections to the SM Higgs doublet field through the heavy states, the righthanded neutrinos and the Z' boson, and find the naturalness bound as mZ'≲7 TeV, in order to reproduce the right electroweak scale for the finetuning level better than 10\%. The resultant mass range of 3.5 TeV ≲mZ'≲7 TeV will be explored at the LHC Run2 in the near future.},
doi = {10.1103/PhysRevD.93.115038},
journal = {Physical Review D},
issn = {24700010},
number = 11,
volume = 93,
place = {United States},
year = {2016},
month = {6}
}
Web of Science
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