Higgs data does not rule out a sequential fourth generation with an extended scalar sector

Abstract

Contrary to the common perception, we show that the current Higgs data does not eliminate the possibility of a sequential fourth generation that get their masses through the same Higgs mechanism as the first three generations. The inability to fix the sign of the bottom-quark Yukawa coupling from the available data plays a crucial role in accommodating a chiral fourth generation which is consistent with the bounds on the Higgs signal strengths. We show that effects of such a fourth generation can remain completely hidden not only in the production of the Higgs boson through gluon fusion but also to its subsequent decay to $\gamma \gamma$ and $Z\gamma$. This, however, is feasible only if the scalar sector of the Standard Model is extended. We also provide a practical example illustrating how our general prescription can be embedded in a realistic model.

9 pages, 2 Figures, no Table; Title and abstract modified, conclusion unchanged, matched with published version. Accepted in Phys. Rev. D (Rapid Communications)

References in corpus (39)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Theory and phenomenology of two-Higgs-doublet models
• Measurements of the Higgs boson production and decay rates and constraints on its couplings from a combined ATLAS and CMS analysis of the LHC $pp$ collision data at $\sqrt{s}=$ 7 and 8 TeV
• The oblique parameters in multi-Higgs-doublet models
• Four Generations and Higgs Physics
• A precision constraint on multi-Higgs-doublet models
• Impact of a Higgs boson at a mass of 126 GeV on the standard model with three and four fermion generations
• Sealing the fate of a fourth generation of fermions
• Probing wrong-sign Yukawa couplings at the LHC and a future linear collider
• Scalar sector of Two-Higgs-Doublet models: A mini-review
• Invisible Higgs Boson Decay into Massive Neutrinos of 4th Generation
• Wrong sign and symmetric limits and non-decoupling in 2HDMs
• Evasive Higgs Maneuvers at the LHC
• Search for pair production of a new heavy quark that decays into a $W$ boson and a light quark in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Scalar sector properties of two-Higgs-doublet models with a global U(1) symmetry
• Nondecoupling of charged scalars in Higgs decay to two photons and symmetries of the scalar potential
• Implications of Higgs Searches on the Four Generation Standard Model
• An extended scalar sector to address the tension between a fourth generation and Higgs searches at the LHC
• Combined search for the quarks of a sequential fourth generation
• Two Higgs doublets with 4th generation fermions - models for TeV-scale compositeness
• Modified Higgs couplings and unitarity violation
• A reappraisal of the wrong-sign $hb\overline{b}$ coupling and the study of $h\to Z\gamma$
• Long Lived Fourth Generation and the Higgs
• Fourth Family Neutrinos and the Higgs Boson
• Higgs data confronts Sequential Fourth Generation Fermions in the Higgs Triplet Model
• Masses of a Fourth Generation with Two Higgs Doublets
• Constraining wrong-sign $hbb$ couplings with $h\to {\rm Y}\gamma$
• Alignment, reverse alignment, and wrong sign Yukawa couplings in two Higgs doublet models
• The 125 GeV Higgs in the context of four generations with 2 Higgs doublets
• Large mass splittings for fourth generation fermions allowed by LHC Higgs exclusion
• Impact of the relatively light fourth family neutrino on the Higgs boson search
• New limits on $\tan \beta$ for 2HDMs with ${\mathbf{Z}}_2$ symmetry
• Revisiting Constraints on Fourth Generation Neutrino Masses
• On the nature of the fourth generation neutrino and its implications
• The Need for New Search Strategies for Fourth Generation Quarks at the LHC
• The Wrong Sign limit in the 2HDM
• Comment on an invisible Higgs boson and 50 GeV neutrino
• The rise and fall of the fourth quark-lepton generation

Cited by in corpus (19)

• Confirming $U(1{)}_{L_{\mu }-L_{\tau }}$ as a solution for $(g-2{)}_{\mu }$ with neutrinos
• Cornering the Two Higgs Doublet Model Type II
• Interactions of Astrophysical Neutrinos with Dark Matter: A model building perspective
• Disentangling new physics effects on non-resonant Higgs boson pair production from gluon fusion
• Wrong Sign Bottom Yukawa in Low Energy Supersymmetry
• Constraints on the quark mixing matrix with vector-like quarks
• Chromomagnetic and chromoelectric dipole moments of the top quark in the 4GTHDM
• Closing in on new chiral leptons at the LHC
• Confronting the fourth generation two Higgs doublet model with the phenomenology of heavy Higgs bosons
• $H\to Z\gamma$ decay and $CP$ violation
• A variant two-Higgs doublet model with a new Abelian gauge symmetry
• Gauged $L_e-L_{\mu }-L_{\tau }$ symmetry, fourth generation, neutrino mass and dark matter
• Double Higgs boson production as an exclusive probe for a sequential fourth generation with wrong-sign Yukawa couplings
• Investigating the sterile neutrino parameters with QLC in 3 + 1 scenario
• Rescuing 331 bileptons from the Landau pole
• CP-Violation phase analysis via non-trivial correlation of quarks and leptons in 3+1 scenario
• Fixing the number of non-sequential generations within the $SU(2{)}_L\otimes U(1{)}_Y$ gauge group
• Paths to proton stability in grand unification
• $S_4$ symmetric four-generation models for charged leptons