Very light CP-odd scalar in the Two-Higgs-Doublet Model

Abstract

We show that a general two-Higgs-doublet model (THDM) with a very light CP-odd scalar (A) can be compatible with the rho parameter, Br(b --> sγ), R_b, A_b, (g-2) of muon, Br(Upsilon --> A gamma), and the direct search via the Yukawa process at LEP. For its mass around 0.2 GeV, the muon (g-2) and Br(Upsilon --> A γ) data require tan(beta) to be about 1. Consequently, A can behave like a fermiophobic CP-odd scalar and predominantly decay into a photon pair ("gamma gamma"), which registers in detectors of high energy collider experiments as a single photon signature when the momentum of A is large. We compute the partial decay width of Z --> A A A and the production rate of f \bar{f} --> Z A A --> Z +"gamma gamma", f^' {\bar f} --> W^{\pm} A A --> W^\pm + "gamma gamma" and f \bar f --> H^+ H^- --> W^+ W^- A A --> W^+ W^- + "gamma gamma" at high energy colliders such as LEP, Tevatron, LHC, and future Linear Colliders. Other production mechanisms of a light A, such as gg --> h --> AA --> "gamma gamma", are also discussed.

Some improvementes, references updated, 3 new figures, one new appendix, abstract and conclusions unchaged. Version to appear in Physical Review D

References in corpus (3)

• Precise Measurement of the Positive Muon Anomalous Magnetic Moment
• The Muon Anomalous Magnetic Moment: A Harbinger For "New Physics"
• Search for a fermiophobic Higgs at LEP 2

Cited by in corpus (31)

• New physics explanations of $a_{\mu }$ in light of the FNAL muon $g-2$ measurement
• Light Neutralino Dark Matter in the NMSSM
• Limiting two-Higgs-doublet models
• Lepton-Specific Two-Higgs Doublet Model: Experimental Constraints and Implication on Higgs Phenomenology
• Leptonic Precision Test of Leptophilic Two-Higgs-Doublet Model
• Revisiting lepton-specific 2HDM in light of muon g-2 anomaly
• Scalar sector properties of two-Higgs-doublet models with a global U(1) symmetry
• Hunting a light CP-odd non-standard Higgs boson through its tauonic decay at a (Super) B factory
• Two-loop Barr-Zee type Contributions to $(g-2{)}_{\mu }$ in the MSSM
• LHC $\tau$-rich Tests of Lepton-specific 2HDM for $(g-2{)}_{\mu }$
• The 2HD+a model for a combined explanation of the possible excesses in the CDF ${\mathbf{M}}_{\mathbf{W}}$ measurement and $(\mathbf{g}-2{)}_{\mu }$ with Dark Matter
• Searching for a light Fermiophobic Higgs Boson at the Tevatron
• Searching for a very light Higgs boson at the Tevatron
• Lepton Dipole Moments and Rare Decays in the CP-violating MSSM with Nonuniversal Soft-Supersymmetry Breaking
• Rare Z-decay into light CP-odd Higgs bosons: a comparative study in different new physics models
• Searching in CMS Open Data for Dimuon Resonances with Substantial Transverse Momentum
• Muon $g-2$ in a two-Higgs-doublet model with a type-II seesaw mechanism
• Decay H^+ -> W^+ gamma in a nonlinear R_xi-gauge
• Update on very light CP-odd scalar in the Two-Higgs-Doublet Model
• Faking SM Photons by Displaced Dark Photon Decays
• Implications of a very light pseudoscalar boson on lepton flavor violation
• The Muon Magnetic Moment and Physics Beyond the Standard Model
• A 17 MeV pseudoscalar and the LSND, MiniBooNE and ATOMKI anomalies
• Models with two Higgs doublets and a light pseudoscalar:a portal to dark matter and the possible $(\mathbf{g}-2{)}_{\mu }$ excess
• Probing the Light Pseudoscalar Window
• Rare Z-decay into light pseudoscalar bosons in the simplest little Higgs model
• Dipole moments of charged leptons in the THDM-III with Textures
• Supersymmetric One-family Model without Higgsinos
• Muon g-2 Anomaly confronted with the higgs global data in the Left-Right Twin Higgs Models
• Leptonic probes of Alternative Left-Right Symmetric Models
• On the possibility of a very light A^0 at low \tanβ