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Title: Chiral heavy fermions in a two Higgs doublet model: 750 GeV resonance or not

Abstract

For this article, we revisit models where a heavy chiral 4th generation doublet of fermions is embedded in a class of two Higgs doublets models (2HDM) with a discrete Z2 symmetry, which couples the “heavy” scalar doublet only to the 4th generation fermions and the “light” one to the Standard Model (SM) fermions – the so-called 4G2HDM introduced by us several years ago. We study the constraints imposed on the 4G2HDM from direct searches of heavy fermions, from precision electroweak data (PEWD) and from the measured production and decay signals of the 125 GeV scalar, which in the 4G2HDM corresponds to the lightest CP-even scalar h. We then show that the recently reported excess in the γγspectrum around 750 GeV can be accommodated by the heavy CP-even scalar of the 4G2HDM, H, resulting in a unique choice of parameter space: negligible mixing (sin α ≲ O (10-3)) between the two CP-even scalars h, Hand heavy 4th generation quark and lepton masses mt',mb' ≲ 400 GeV and mν', mτ' ≳ 900 GeV, respectively. Whether or not the 750 GeV γγ resonance is confirmed, interesting phenomenology emerges in q' – Higgs systems (q' = t', b'), that can be searched for at the LHC. For example, the heavy scalar states of the model, S=H, A, H+, may have BR(S→$$-\atop{q'}$$q') ~ O(1), giving rise to observable $$-\atop{q'}$$q' signals on resonance, followed by the flavor changing q' decays t'→uh (u =u, c) and/or b'→dh (d =d, s, b). This leads to rather distinct signatures, with or without charged leptons, of the form $$-\atop{q'}$$q'→(nj +mb +ℓW)S (j and b being light and b-quark jets, respectively), with n +m +ℓ =6–8 and unique kinematic features. These high jet-multiplicity signals appear to be very challenging and may need new search strategies for detection of such heavy chiral quarks. It is also shown that the flavor structure of the 4G2HDM can easily accommodate the interesting recent indications of a percent-level branching ratio in the lepton-flavor-violating (LFV) decay h →τμ of the 125 GeV Higgs, if it is experimentally confirmed.

Authors:
 [1];  [2]
+ Show Author Affiliations
  1. Technion-Israel Inst. of Tech., Haifa (Israel). Physics Dept.
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Physics
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1337704
Alternate Identifier(s):
OSTI ID: 1424958
Report Number(s):
BNL-113900-2017-JAAM
Journal ID: ISSN 0370-2693; S0370269316307924; PII: S0370269316307924
Grant/Contract Number:  
SC0012704
Resource Type:
Published Article
Journal Name:
Physics Letters. B
Additional Journal Information:
Journal Name: Physics Letters. B Journal Volume: 766 Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Bar-Shalom, Shaouly, and Soni, Amarjit. Chiral heavy fermions in a two Higgs doublet model: 750 GeV resonance or not. Netherlands: N. p., 2017. Web. doi:10.1016/j.physletb.2016.12.046.
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Bar-Shalom, Shaouly, & Soni, Amarjit. Chiral heavy fermions in a two Higgs doublet model: 750 GeV resonance or not. Netherlands. https://doi.org/10.1016/j.physletb.2016.12.046
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Bar-Shalom, Shaouly, and Soni, Amarjit. Fri . "Chiral heavy fermions in a two Higgs doublet model: 750 GeV resonance or not". Netherlands. https://doi.org/10.1016/j.physletb.2016.12.046.
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@article{osti_1337704,
title = {Chiral heavy fermions in a two Higgs doublet model: 750 GeV resonance or not},
author = {Bar-Shalom, Shaouly and Soni, Amarjit},
abstractNote = {For this article, we revisit models where a heavy chiral 4th generation doublet of fermions is embedded in a class of two Higgs doublets models (2HDM) with a discrete Z2 symmetry, which couples the “heavy” scalar doublet only to the 4th generation fermions and the “light” one to the Standard Model (SM) fermions – the so-called 4G2HDM introduced by us several years ago. We study the constraints imposed on the 4G2HDM from direct searches of heavy fermions, from precision electroweak data (PEWD) and from the measured production and decay signals of the 125 GeV scalar, which in the 4G2HDM corresponds to the lightest CP-even scalar h. We then show that the recently reported excess in the γγspectrum around 750 GeV can be accommodated by the heavy CP-even scalar of the 4G2HDM, H, resulting in a unique choice of parameter space: negligible mixing (sin α ≲ O (10-3)) between the two CP-even scalars h, Hand heavy 4th generation quark and lepton masses mt',mb' ≲ 400 GeV and mν', mτ' ≳ 900 GeV, respectively. Whether or not the 750 GeV γγ resonance is confirmed, interesting phenomenology emerges in q' – Higgs systems (q' = t', b'), that can be searched for at the LHC. For example, the heavy scalar states of the model, S=H, A, H+, may have BR(S→$-\atop{q'}$q') ~ O(1), giving rise to observable $-\atop{q'}$q' signals on resonance, followed by the flavor changing q' decays t'→uh (u =u, c) and/or b'→dh (d =d, s, b). This leads to rather distinct signatures, with or without charged leptons, of the form $-\atop{q'}$q'→(nj +mb +ℓW)S (j and b being light and b-quark jets, respectively), with n +m +ℓ =6–8 and unique kinematic features. These high jet-multiplicity signals appear to be very challenging and may need new search strategies for detection of such heavy chiral quarks. It is also shown that the flavor structure of the 4G2HDM can easily accommodate the interesting recent indications of a percent-level branching ratio in the lepton-flavor-violating (LFV) decay h →τμ of the 125 GeV Higgs, if it is experimentally confirmed.},
doi = {10.1016/j.physletb.2016.12.046},
journal = {Physics Letters. B},
number = C,
volume = 766,
place = {Netherlands},
year = {Fri Mar 10 00:00:00 EST 2017},
month = {Fri Mar 10 00:00:00 EST 2017}
}
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Works referenced in this record:

How much space is left for a new family of fermions?
journal, June 2009

Electroweak symmetry breaking by fourth-generation condensates and the neutrino spectrum
journal, May 1991

  • Hill, Christopher T.; Luty, Markus A.; Paschos, Emmanuel A.
  • Physical Review D, Vol. 43, Issue 9
  • DOI: 10.1103/PhysRevD.43.3011

The Strongly Coupled Fourth Family and a First-Order Electroweak Phase Transition. I: -- Quark Sector --
journal, August 2009

  • Kikukawa, Y.; Kohda, M.; Yasuda, J.
  • Progress of Theoretical Physics, Vol. 122, Issue 2
  • DOI: 10.1143/PTP.122.401

Is electroweak symmetry broken by a fourth family of quarks?
journal, January 1990

Bounding CKM mixing with a fourth family
journal, June 2009

Fourth generation t ′ quark in extensions of the standard model
journal, August 2009

125 GeV Higgs state in the context of four generations with two Higgs doublets
journal, December 2012

Promising interpretation of diphoton resonance at 750 GeV
journal, July 2016

Quarks and leptons beyond the third generation
journal, June 2000

Sealing the fate of a fourth generation of fermions
journal, September 2012

Review of Particle Physics
journal, August 2014

Precision Constraints on Extra Fermion Generations
journal, July 2010

Dynamical electroweak symmetry breaking with large anomalous dimension and t quark condensate
journal, April 1989

CP -conserving two-Higgs-doublet model: The approach to the decoupling limit
journal, April 2003

Four statements about the fourth generation
journal, September 2009

Fourth generation b ′ decays into b + Higgs boson
journal, February 2000

New strongly coupled sector at the Tevatron and the LHC
journal, February 2011

Electroweak phase transition in the minimal supersymmetric standard model with four generations
journal, January 2005

Wide or narrow? The phenomenology of 750 GeV diphotons
journal, June 2016

Can the new resonance at LHC be a CP-odd Higgs boson?
journal, June 2016

Knocking on new physics’ door with a scalar resonance
journal, March 2016

Renormalization group fixed point with a fourth generation: Higgs-induced bound states and condensates
journal, June 2011

First interpretation of the 750 GeV diphoton resonance at the LHC
journal, May 2016

Hybrid dynamical electroweak symmetry breaking with heavy quarks and the 125 GeV Higgs boson
journal, February 2014

Collider signatures of mirror fermions in the framework of a left-right mirror model
journal, November 2013

Heavy Higgs decay to t t ¯ Z and constraints on a 750 GeV pseudoscalar
journal, July 2016

750 GeV diphoton excess
journal, May 2016

Two Higgs doublets with fourth-generation fermions: Models for TeV-scale compositeness
journal, September 2011

Higgs coupling constants as a probe of new physics
journal, December 2004

Minimal dynamical symmetry breaking of the standard model
journal, March 1990

  • Bardeen, William A.; Hill, Christopher T.; Lindner, Manfred
  • Physical Review D, Vol. 41, Issue 5
  • DOI: 10.1103/PhysRevD.41.1647

Dynamical electroweak symmetry breaking with two composite Higgs doublets
journal, May 1990

Dynamical electroweak symmetry breaking with a heavy fourth generation
journal, July 2011

Study of some rare decays of B s meson in the fourth generation model
journal, January 2012

An extended scalar sector to address the tension between a fourth generation and Higgs searches at the LHC
journal, February 2012

New constraint on a strongly interacting Higgs sector
journal, August 1990

Heavy Quarks and Electroweak Symmetry Breaking
journal, November 1986

Strongly coupled fourth generation at the LHC
journal, April 2009

Muon g−2 and lepton flavor violation in a two Higgs doublets model for the fourth generation
journal, March 2012

The global electroweak fit at NNLO and prospects for the LHC and ILC
journal, September 2014

Large time-dependent C P violation in the B s 0 system and finite D 0 − D ¯ 0 mass difference in a four generation standard model
journal, July 2007

Less space for a new family of fermions
journal, November 2010

Higgs data confronts sequential fourth generation fermions in the Higgs triplet model
journal, April 2014

Diphoton excess in the 2HDM: Hastening towards instability and the nonperturbative regime
journal, December 2016

Heavy Quarks and Electroweak Symmetry Breaking
journal, January 1987

Electroweak constraints on the fourth generation at two loop order
journal, July 2013

The <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msub><mml:mi>E</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:math> inspired isosinglet quark and the Higgs boson
journal, October 2008

Standard model with four generations: Selected implications for rare B and K decays
journal, August 2010

Source of cp Violation for the Baryon Asymmetry of the Universe
journal, August 2011

Electroweak baryogenesis and new TeV fermions
journal, June 2005

Pseudoscalar Higgs bosons at the LHC: production and decays into electroweak gauge bosons revisited
journal, May 2010

Four generations and Higgs physics
journal, October 2007

Parton distributions for the LHC
journal, July 2009

Anatomy of the Higgs mass spectrum
journal, June 1997

The fourth family: A simple explanation for the observed pattern of anomalies in <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi>B</mml:mi><mml:mtext>–</mml:mtext><mml:mi mathvariant="italic">CP</mml:mi></mml:math> asymmetries
journal, January 2010

Implication of a quasi fixed point with a heavy fourth generation: The emergence of a TeV-scale physical cutoff
journal, January 2011

Dynamical Model of Elementary Particles Based on an Analogy with Superconductivity. I
journal, April 1961

Constraints on the four-generation quark mixing matrix from a fit to flavor-physics data
journal, April 2011

Higgs mass constraints on a fourth family: Upper and lower limits on CKM mixing
journal, August 2010

750 GeV diphoton excess and its explanation in two-Higgs-doublet models with a real inert scalar multiplet
journal, March 2016

Search for Resonant Production of High-Mass Photon Pairs in Proton-Proton Collisions at s = 8 and 13 TeV
journal, July 2016

Estimation of oblique electroweak corrections
journal, July 1992

Search for lepton-flavour-violating decays of the Higgs boson
journal, October 2015

IS THE t QUARK RESPONSIBLE FOR THE MASS OF W AND Z BOSONS?
journal, June 1989

  • Miransky, V. A.; Tanabashi, Masaharu; Yamawaki, Koichi
  • Modern Physics Letters A, Vol. 04, Issue 11
  • DOI: 10.1142/S0217732389001210

Renormalization-group-improved unitarity bounds on the Higgs-boson and top-quark masses
journal, September 1989

Scenarii for interpretations of the LHC diphoton excess: Two Higgs doublets and vector-like quarks and leptons
journal, May 2016

Combined results of searches for the standard model Higgs boson in pp collisions at <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>7</mml:mn><mml:mtext> TeV</mml:mtext></mml:math>
journal, March 2012

Gauged Two Higgs Doublet Model confronts the LHC 750 GeV diphoton anomaly
journal, August 2016

Two Higgs Doublets, a 4th Generation and a 125 GeV Higgs: A Review
journal, January 2013

  • Bar-Shalom, Shaouly; Geller, Michael; Nandi, Soumitra
  • Advances in High Energy Physics, Vol. 2013
  • DOI: 10.1155/2013/672972

Four generations, the electroweak phase transition, and supersymmetry
journal, October 2008

Implications of Higgs Searches on the Four-Generation Standard Model
journal, February 2013

Higgs decays in the two Higgs doublet model: large quantum effects in the decoupling regime
journal, January 2004

Dynamical symmetry breaking, CP violation, and a Higgs-like particle
journal, April 2013

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