Standard Model couplings and collider signatures of a light scalar

Abstract

The electroweak symmetry breaking (EWSB) sector of the Standard Model can be far richer and more interesting than the usual single scalar doublet model. We explore scenarios where the EWSB sector is nearly scale invariant and consequently gives rise to a light CP even scalar particle. The one-doublet SM is in that category, as are many other models with either weakly or strongly coupled sectors that trigger EWSB. We study the couplings of the light scalar to the SM particles that can arise from the explicit breaking of scale invariance focusing on the possible differences with the minimal SM. The couplings of the light scalar to light fermions, as well as to the massless gauge bosons, can be significantly enhanced. We find possible new discovery channels due to the decays of the conformal scalar into e^+e^- and mu^+mu^- pairs as well as new production channels via light quark annihilation.

arXiv comment10 pages, 7 figures

References in corpus (38)

• A Large Mass Hierarchy from a Small Extra Dimension
• The Cosmological Parameters 2006
• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• Modulus Stabilization with Bulk Fields
• The Minimal Composite Higgs Model
• Minimal Flavour Violation: an effective field theory approach
• The Littlest Higgs
• The Strongly-Interacting Light Higgs
• The Twin Higgs: Natural Electroweak Breaking from Mirror Symmetry
• TeV Symmetry and the Little Hierarchy Problem
• Universal Unitarity Triangle and Physics Beyond the Standard Model
• Towards a Realistic Model of Higgsless Electroweak Symmetry Breaking
• Walking in the SU(N)
• Light Composite Higgs from Higher Representations versus Electroweak Precision Measurements -- Predictions for LHC
• Little Higgses from an Antisymmetric Condensate
• Extracting Higgs boson couplings from LHC data
• The Little Higgs from a Simple Group
• A solution to the hierarchy problem from an almost decoupled hidden sector within a classically scale invariant theory
• Anomalous Higgs boson couplings in vector boson fusion at the CERN LHC
• A Warped Supersymmetric Standard Model
• Electroweak Higgs as a pseudo-Goldstone boson of broken scale invariance
• Shadow Higgs from a scale-invariant hidden $U(1{)}_s$ model
• A Simple Model of two Little Higgses
• Profiles of the Unitarity Triangle and CP-Violating Phases in the Standard Model and Supersymmetric Theories
• Modifications to the Properties of the Higgs Boson
• Discovering an Invisibly Decaying Higgs at Hadron Colliders
• Unparticles-Higgs Interplay
• Hiding the Higgs at the LHC
• $h\to {\mu }^{+}{\mu }^{-}$ via gluon fusion at the LHC
• Higgs Decays to Muons in Weak Boson Fusion
• Search for New High Mass Particles Decaying to Lepton Pairs in pbarp Collisions at sqrt(s)=1.96 TeV
• Maximum Significance at the LHC and Higgs Decays to Muons
• DISCOVERING THE HIGGS BOSONS OF MINIMAL SUPERSYMMETRY WITH MUONS
• Two Higgs Models for Large Tan Beta and Heavy Second Higgs
• The Higgs Decay Width in Multi-Scalar Doublet Models
• Discovering the Higgs Bosons of Minimal Supersymmetry with Muons and a Bottom Quark
• New Physics Effects in Higgs Decay to Tau Leptons
• Discovering the Higgs Bosons of Minimal Supersymmetry with Tau Leptons and a Bottom Quark

Cited by in corpus (54)

• Composite Higgses
• Flavour-Changing Decays of a 125 GeV Higgs-like Particle
• New Physics in LHC Higgs boson pair production
• A Higgslike Dilaton
• Tasi 2009 lectures: The Higgs as a Composite Nambu-Goldstone Boson
• Have We Observed the Higgs (Imposter)?
• Global Analysis of the Higgs Candidate with Mass ~ 125 GeV
• Effective Theory of a Light Dilaton
• A Light Dilaton in Walking Gauge Theories
• A Naturally Light Dilaton and a Small Cosmological Constant
• Gravity-mediated (or Composite) Dark Matter
• Electroweak Symmetry Breaking and the Higgs Boson: Confronting Theories at Colliders
• Global Analysis of Experimental Constraints on a Possible Higgs-Like Particle with Mass ~ 125 GeV
• Phenomenology of a light scalar: the dilaton
• Directly Measuring the Tensor Structure of the Scalar Coupling to Gauge Bosons
• Evasive Higgs Maneuvers at the LHC
• Composite Higgs Search at the LHC
• A Very Light Dilaton
• Holographic techni-dilaton at 125 GeV
• Is 125 GeV techni-dilaton found at LHC?
• Dynamical Stabilization of the Fermi Scale: Phase Diagram of Strongly Coupled Theories for (Minimal) Walking Technicolor and Unparticles
• Discovering 125 GeV techni-dilaton at LHC
• Differentiating the Higgs boson from the dilaton and the radion at hadron colliders
• Minimal Dilaton Model
• Techni-dilaton at 125 GeV
• Higher-Loop Structural Properties of the $\beta$ Function in Asymptotically Free Vectorial Gauge Theories
• The Unhiggs
• Spin-2 Resonances in Vector-Boson-Fusion Processes at NLO QCD
• Dilaton constraints and LHC prospects
• Conformal Standard Model with an extended scalar sector
• Note on 125 GeV Spin-2 particle
• Interpreting the 750 GeV diphoton excess in the Minimal Dilaton Model
• A Light Scalar in the Minimal Dilaton Model in Light of LHC Constraints
• Precocious Diphoton Signals of the Little Radion at Hadron Colliders
• A light dilaton at the LHC
• Higgs-radion unification: radius stabilization by an SU(2) bulk doublet and the 126 GeV scalar
• Interactions of a Stabilized Radion and Duality
• Unconstraining the Unhiggs
• Generalized Skyrmions in QCD and the Electroweak Sector
• Dynamical vector resonances from the EChL in VBS at the LHC: the WW case
• A dilaton-pion mass relation
• Constraints on the Unhiggs Model from Top Quark Decay
• Determination of SU(4)${}_{TC}$ Technicolor Gauge Group from Embedding in Extended Technicolor
• Flavour-changing Higgs decays into bottom and strange quarks in supersymmetry
• Searching for a dilaton decaying to muon pairs at the LHC
• Higgs Boson as a Dilaton
• The Radion as a Harbinger of Deca-TeV Physics
• Indications on the Mass of the Lightest Electroweak Baryon
• A technique for natural gauge boson masses
• Peccei-Quinn violating minimal supergravity and a 126 GeV Higgs
• Higgs Decays in Gauge Extensions of the Standard Model
• Dilaton decays into unparticles and a single photon
• On the compatibility of the diboson excess with a gg-initiated composite sector
• A note on the coupling of the techni-dilaton to the weak bosons