Current Status of Top-Specific Variant Axion Model

Abstract

The invisible variant axion model is very attractive as it is free from the domain wall problem. This model requires at least two Higgs doublets at the electroweak scale, with one Higgs doublet carrying a nonzero Peccei-Quinn (PQ) charge and the other being neutral under the PQ $\text{U}(1)$ symmetry. We consider a scenario where only the right-handed top quark is charged under the PQ symmetry and couples with the PQ-charged Higgs doublet. As a general prediction of this model, the top quark can decay to the observed standard model-like Higgs boson $h$ and the charm or up quark, $t\to hc/u$, which recently exhibit slight excesses at LHC Run-I and Run-II. It will soon be testable at the LHC Run-II. If the rare top decay excess stays at the observed central value, we show that $\tan \beta \sim 1$ or smaller is preferred by the Higgs data. The chiral nature of the Higgs flavor-changing interaction is a distinctive feature, and can be tested using the angular distribution of the $t\to ch$ decays at the LHC.

18 pages, 7 figures. arXiv admin note: text overlap with arXiv:1507.04354

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• Big-Bang Nucleosynthesis
• -- HATHOR -- HAdronic Top and Heavy quarks crOss section calculatoR
• Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at $\sqrt{s}=8$ TeV Using the ATLAS Detector
• Search for top quark decays $t\to qH$, with $H\to \gamma \gamma$, in $\sqrt{s}=13$ TeV $pp$ collisions using the ATLAS detector
• Search for top quark decays via Higgs-boson-mediated flavor-changing neutral currents in pp collisions at sqrt(s) = 8 TeV
• Searching for t->c(u)h with dipole moments

Cited by in corpus (9)

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• Stellar cooling anomalies and variant axion models
• Flavor-Violating Higgs Decays and Stellar Cooling Anomalies in Axion Models
• Search for flavour-changing neutral-current couplings between the top quark and the Higgs boson in multi-lepton final states in 13 TeV $pp$ collisions with the ATLAS detector
• Muon g-2 and rare top decays in up-type specific variant axion models
• Search for flavour-changing neutral current interactions of the top quark and the Higgs boson in events with a pair of $\tau$-leptons in pp collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Classification of three-family flavoured DFSZ axion models that have no domain wall problem
• Probing chirality structure in lepton-flavour-violating Higgs decay $h\to \tau \mu$ at the LHC