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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 (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 Run-2 for the sequential Z' boson to constrain the parameter region in our model. Combining the constraints from themore » electroweak vacuum stability and the LHC Run-2 results, we find a bound on the Z' boson mass as m Z'≳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 m Z'≲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 ≲m Z'≲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. doi:10.1103/PhysRevD.93.115038.
Das, Arindam, Oda, Satsuki, Okada, Nobuchika, and Takahashi, Dai-suke. Wed . "Classically conformal U(1)' extended standard model, electroweak vacuum stability, and LHC Run-2 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 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},
journal = {Physical Review D},
issn = {2470-0010},
number = 11,
volume = 93,
place = {United States},
year = {2016},
month = {6}
}

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