Flavor violating top decays and flavor violating quark decays of the Higgs boson

Abstract

In the standard model flavor violating decays of the top quark and of the Higgs boson are highly suppressed. Further, the flavor violating decays of the top and of the Higgs are also small in MSSM and not observable in current or in near future experiment. In this work we show that much larger branching ratios for these decays can be achieved in an extended MSSM model with an additional vector like quark generation. Specifically we show that in the extended model one can achieve branching ratios for $t\to h^{0}c$ and $t\to h^{0}u$ as large as the current experimental upper limits given by the ATLAS and the CMS Collaborations. We also analyze the flavor violating quark decay of the Higgs boson, i.e., $h^0\to b\bar{s}+\bar{b}s$ and $h^0\to b\bar{d}+\bar{b}d$. Here again one finds that the branching ratio for these decays can be as large as $O(1)\%$. The analysis is done with inclusion of the CP phases in the Higgs sector, and the effect of CP phases on the branching ratios is investigated. Specifically the Higgs sector spectrum and mixings are computed involving quarks and mirror quarks, squarks and mirror squarks in the loops consistent with the Higgs boson mass constraint. The resulting effective Lagrangian with inclusion of the vector like quark generation induce flavor violating decays at the tree level. The test of the branching ratios predicted could come with further data from LHC13 and such branching ratios could also be accessible at future colliders such as the Higgs factories where the Higgs couplings to fermions will be determined with greater precision.

arXiv comment26 pages. 8 figures

References in corpus (62)

• 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
• Higgs Bosons in the Minimal Supersymmetric Standard Model with Explicit CP Violation
• The Neutron and the Electron Electric Dipole Moment in N=1 Supergravity Unification
• Electric Dipole Moments Do Not Require the CP-violating Phases of Supersymmetry To Be Small
• Renormalization-Group-Improved Effective Potential for the MSSM Higgs Sector with Explicit CP Violation
• Higgs Scalar-Pseudoscalar Mixing in the Minimal Supersymmetric Standard Model
• The Neutron and the Lepton EDMs in MSSM, Large CP violating Phases, and the Cancellation Mechanism
• Search for lepton-flavour-violating decays of the Higgs boson
• Effects of the supersymmetric phases on the neutral Higgs sector
• CP-Odd Tadpole Renormalization of Higgs Scalar-Pseudoscalar Mixing
• Extra vector-like matter and the lightest Higgs scalar boson mass in low-energy supersymmetry
• Loop Corrections to the Neutral Higgs Boson Sector of the MSSM with Explicit CP Violation
• A new evaluation of the t->cH decay width in the standard model
• Effects of mixing with quark singlets
• The Higgs sector of the complex MSSM at two-loop order: QCD contributions
• FCNC top quark decay in the MSSM: a door to SUSY physics in high luminosity colliders?
• Higgs Boson Mass, Sparticle Spectrum and Little Hierarchy Problem in Extended MSSM
• SUSY-induced FCNC top-quark processes at the Large Hadron Collider
• More on Electric Dipole Moment Constraints on Phases in the Constrained MSSM
• Top-quark rare decay $t\to ch$ in R-parity-violating SUSY
• Large CP Phases and the Cancellation Mechanism in EDMs in SUSY, String and Brane Models
• Flavour Changing Higgs Couplings in a Class of Two Higgs Doublet Models
• Loop Induced Flavor Changing Neutral Decays of the Top Quark in a General Two-Higgs-Doublet Model
• Corrections to the Higgs Boson Masses and Mixings from Chargino, W and Charged Higgs Exchange Loops and Large CP Phases
• New Vector-Like Fermions and Flavor Physics
• When the Higgs meets the Top: Search for t --> ch^0 at the LHC
• Search for lepton-flavour-violating $H\to \mu \tau$ decays of the Higgs boson with the ATLAS detector
• Neutralino Exchange Corrections to the Higgs Boson Mixings with Explicit CP Violation
• Top-quark decay into Higgs boson and a light quark at next-to-leading order in QCD
• CPsuperH2.3: an Updated Tool for Phenomenology in the MSSM with Explicit CP Violation
• Constraining models with vector-like fermions from FCNC in K and B physics
• Higgs boson couplings to quarks with supersymmetric CP and flavor violations
• A Unified Framework for Symmetry Breaking in SO(10)
• Scalar FCNC and rare top decays in a two Higgs doublet model "for the top"
• SUSY induced top quark FCNC decay $t\to ch$ after Run I of LHC
• Fermion Mass Generation in SO(10) with a Unified Higgs Sector
• The Chromoelectric Dipole Moment of the Top Quark in Models with Vector Like Multiplets
• The Hunt for New Physics in the Flavour Sector with up vector-like quarks
• Variety of SO(10) GUTs with Natural Doublet-Triplet Splitting via the Missing Partner Mechanism
• An MSSM Extension with a Mirror Fourth Generation, Neutrino Magnetic Moments and LHC Signatures
• The top quark electric dipole moment in an MSSM extension with vector like multiplets
• Supersymmetry and Vector-like Extra Generation
• Search for top quark decays via Higgs-boson-mediated flavor-changing neutral currents in pp collisions at sqrt(s) = 8 TeV
• Higgs diphoton rate and mass enhancement with vector-like leptons and the scale of supersymmetry
• Large Tau and Tau Neutrino Electric Dipole Moments in Models with Vector Like Multiplets
• Constraining the flavor changing Higgs couplings to the top-quark at the LHC
• Search for flavour-changing neutral current top quark decays $t\to Hq$ in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Electron EDM as a Sensitive Probe of PeV Scale Physics
• Yukawa Couplings and Quark and Lepton Masses in an SO(10) Model with a Unified Higgs Sector
• Radiative Decays of Cosmic Background Neutrinos in Extensions of MSSM with a Vector Like Lepton Generation
• Leptonic $g-2$ moments, CP phases and the Higgs boson mass constraint
• A Detailed Analysis of Flavour-changing Decays of Top Quarks as a Probe of New Physics at the LHC
• $\tau \to \mu \gamma$ Decay in Extensions with a Vector Like Generation
• Revisiting the flavor changing neutral current Higgs decays $H\to q_i{q}_j$ in the Standard Model
• Chromoelectric Dipole Moments of Quarks in MSSM Extensions
• Flavor Changing Higgs Decays in Supersymmetry with Minimal Flavor Violation
• Flavour-changing Higgs decays into bottom and strange quarks in supersymmetry
• The Quark Flavor Violating Higgs Decay $h\to \bar{b}s+b\bar{s}$ in the MSSM
• Flavor violating leptonic decays of the Higgs boson
• The Higgs boson mass constraint and the CP even-CP odd Higgs boson mixing in an MSSM extension
• Searches for flavour changing neutral currents in the top sector

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• Large $h\to bs$ in generic two-Higgs-doublet models