Rare Top-quark Decays to Higgs boson in MSSM

Abstract

In full one-loop generality and in next-to-leading order in QCD, we study rare top to Higgs boson flavour changing decay processes $t\to qh$ with $q=u,c$ quarks, in the general MSSM with R-parity conservation. Our primary goal is to search for enhanced effects on $Br(t\to qh)$ that could be visible at current and high luminosity LHC running. To this end, we perform an analytical expansion of the amplitude in terms of flavour changing squark mass insertions that treats both cases of hierarchical and degenerate squark masses in a unified way. We identify two enhanced effects allowed by various constraints: one from holomorphic trilinear soft SUSY breaking terms and/or right handed up squark mass insertions and another from non-holomorphic trilinear soft SUSY breaking terms and light Higgs boson masses. Interestingly, even with $\mathcal{O}(1)$ flavour violating effects in the, presently unconstrained, up-squark sector, SUSY effects on $Br(t\to qh)$ come out to be unobservable at LHC mainly due to leading order cancellations between penguin and self energy diagrams and the constraints from charge- and colour-breaking minima (CCB) of the MSSM vacuum. An exception to this conclusion may be effects arising from non-holomorphic soft SUSY breaking terms in the region where the CP-odd Higgs mass is smaller than the top-quark mass but this scenario is disfavoured by recent LHC searches. Our calculations for $t\to qh$ decay are made available in SUSY_FLAVOR numerical library.

arXiv comment32 pages, 6 figures; version accepted for publication in JHEP: additional comparison with literature added, minor misprints corrected

References in corpus (58)

• 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
• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• A Supersymmetry Primer
• Observation of Top Quark Production in Pbar-P Collisions
• Minimal Flavour Violation: an effective field theory approach
• Observation of the Top Quark
• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
• A complete analysis of FCNC and CP constraints in general SUSY extensions of the standard model
• Observation of Tau Neutrino Interactions
• SUSY Les Houches Accord 2
• Strong Constraints on the Parameter Space of the MSSM from Charge and Color Breaking Minima
• Complete set of Feynman rules for the MSSM -- ERRATUM
• Phase Transitions and Vacuum Tunneling Into Charge and Color Breaking Minima in the MSSM
• A new evaluation of the t->cH decay width in the standard model
• Soft Yukawa couplings in supersymmetric theories
• FCNC top quark decay in the MSSM: a door to SUSY physics in high luminosity colliders?
• Stability Bounds on Flavor-Violating Trilinear Soft Terms in the MSSM
• Vevacious: A Tool For Finding The Global Minima Of One-Loop Effective Potentials With Many Scalars
• Constraints on Phases of Supersymmetric Flavour Conserving Couplings
• Helicity fractions of W bosons from top quark decays at NNLO in QCD
• SUSY-induced FCNC top-quark processes at the Large Hadron Collider
• Search for new phenomena in final states with large jet multiplicities and missing transverse momentum at sqrt(s)=8 TeV proton-proton collisions using the ATLAS experiment
• Supersymmetry and FCNC effects
• The Mass of the Lightest MSSM Higgs Boson: A Compact Analytical Expression at the Two-Loop Level
• Probing top flavour-changing neutral scalar couplings at the CERN LHC
• Stability of the CMSSM against sfermion VEVs
• When the Higgs meets the Top: Search for t --> ch^0 at the LHC
• Charge and Color Breaking Constraints in MSSM after the Higgs Discovery at LHC
• Vacuum Stability and the MSSM Higgs Mass
• The light stop window
• SUSY_FLAVOR: a computational tool for FCNC and CP-violating processes in the MSSM
• Hierarchical Soft Terms and Flavor Physics
• $K\to \pi \nu \bar{\nu }$: A Model Independent Analysis and Supersymmetry
• Snowmass 2013 Top quark working group report
• Vacuum decay along supersymmetric flat directions
• Top-quark decay into Higgs boson and a light quark at next-to-leading order in QCD
• Soft Supersymmetry Breaking, Scalar Top-Charm Mixing and Higgs Signatures
• Model building for flavor changing Higgs couplings
• Effective Higgs Vertices in the generic MSSM
• Search for top quark decays $t\to qH$ with $H\to \gamma \gamma$ using the ATLAS detector
• Complete resummation of chirally-enhanced loop-effects in the MSSM with non-minimal sources of flavor-violation
• SUSY_FLAVOR v2.5: a computational tool for FCNC and CP-violating processes in the MSSM
• Disentangling Flavor Violation in the Top-Higgs Sector at the LHC
• A Supersymmetric Explanation of the Excess of Higgs--Like Events at the LHC and at LEP
• SUSY induced top quark FCNC decay $t\to ch$ after Run I of LHC
• Complete One-Loop MSSM Predictions for B --> lepton lepton' at the Tevatron and LHC
• Stop on Top
• Searching for $t\to ch$ with Multi-Leptons
• Top Decays with Flavor Changing Neutral Higgs Interactions at the LHC
• Implications of the Higgs discovery for the MSSM
• Constraining the flavor changing Higgs couplings to the top-quark at the LHC
• Constraints on flavor-changing neutral-current $Htq$ couplings from the signal of $tH$ associated production with QCD next-to-leading order accuracy at the LHC
• Metastability bounds on flavour-violating trilinear soft terms in the MSSM
• Searching for t->c(u)h with dipole moments
• THE SEARCH FOR SUPERSYMMETRY
• Optimal Charge and Color Breaking conditions in the MSSM
• The Spectrum of the MSSM with Non-Standard Supersymmetry Breaking

Cited by in corpus (26)

• New physics in $b\to s$ transitions after LHC run 1
• Rare Top Decays in Minimal and Non-minimal Universal Extra Dimension
• Probing Anomalous FCNC Top-Higgs Yukawa Couplings at the Large Hadron Electron Collider
• Asymmetry in flavour changing electromagnetic transitions of vector-like quarks
• MassToMI - a Mathematica package for an automatic Mass Insertion expansion
• A Detailed Analysis of Flavour-changing Decays of Top Quarks as a Probe of New Physics at the LHC
• $h^0\to c\bar{c}$ as a test case for quark flavor violation in the MSSM
• $t\to cg$ and $t\to cZ$ in Universal Extra Dimensional Models
• Lepton flavour violation in the MSSM: exact diagonalization vs mass expansion
• Rare top decay $t\to c\gamma$ with flavor changing neutral scalar interactions in two Higgs doublet model
• Exploring the Anomalous Top-Higgs FCNC Couplings at the electron proton colliders
• Search for top quark flavour changing neutral currents in same-sign top quark production
• $CP$ asymmetries in the rare top decays $t\to c\gamma$ and $t\to cg$
• Flavour-changing neutral scalar interactions of the top quark
• Impact of Future Lepton Flavor Violation Measurements in the Minimal Supersymmetric Standard Model
• The supersymmetric Higgs boson with flavoured A-terms
• Mass Insertions vs. Mass Eigenstates calculations in Flavour Physics
• Flavour-changing top quark decays in the alternative left-right model
• Rare top-quark decays $t\to cg(g)$ in the aligned two-Higgs-doublet model
• Two-body decays of gluino at full one-loop level in the quark-flavour violating MSSM
• The decays $h^0\to b\bar{b}$ and $h^0\to c\bar{c}$ in the light of the MSSM with quark flavour violation
• Imprint of SUSY in radiative B-meson decays
• Correlation between the decays $h^0\to \gamma \gamma /gg$ in the MSSM with quark flavour violation
• Signs of Tops from Highly Mixed Stops
• Impact of quark flavor violating SUSY on h(125) decays at future lepton colliders
• $B_{s(d)}-{\bar{B}}_{s(d)}$ Mixing and $B_s\to {\mu }^{+}{\mu }^{-}$ Decay in the NMSSM with the Flavour Expansion Theorem