New physics interpretations for nonstandard values of 
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Boto, Rafael; Das, Dipankar; Romão, Jorge C.; Saha, Ipsita; Silva, Joao P.

doi:10.1103/physrevd.109.095002

Phys. Rev. D

2024

DOI: 10.1103/physrevd.109.095002

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New physics interpretations for nonstandard values of h→Zγ

Rafael Boto,

Dipankar Das,

Jorge C. Romão

et al.

Abstract: Current measurements of the h→Zγ signal strength invite us to speculate about possible new physics interactions that exclusively affect μZγ without altering the other signal strengths. Additional consideration of tree unitarity enables us to correlate the nonstandard values of μZγ with an upper limit on the scale of new physics. We find that even when μZγ deviates from the Standard Model value by only 20%, the scale of new physics should be well within the reach of the LHC. … Show more

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Cited by 8 publications

References 27 publications

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The SM expected branching ratio for h → γγ and an excess for h → Zγ

He,

Huang,

et al. 2024

J. High Energ. Phys.

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The recent measurements of h → Zγ from ATLAS and CMS show an excess of the signal strength μZ = $$ {\left(\sigma \cdotp \mathcal{B}\right)}_{\textrm{obs}}/{\left(\sigma \cdotp \mathcal{B}\right)}_{\textrm{SM}} $$ σ · B obs / σ · B SM = 2.2 ± 0.7, normalized as 1 in the standard model (SM). If confirmed, it would be a signal of new physics (NP) beyond the SM. We study NP explanation for this excess. In general, for a given model, it also affects the process h → γγ. Since the measured branching ratio for this process agrees well with the SM prediction, the model is severely constrained. We find that a minimally fermion singlets and doublet extended NP model can explain simultaneously the current data for h → Zγ and h → γγ. There are two solutions. Although both solutions enhance the amplitude of h → Zγ to the observed one, in one of the solutions the amplitude of h → γγ flips sign to give the observed branching ratio. This seems to be a contrived solution although cannot be ruled out simply using branching ratio measurements alone. However, we find another solution that naturally enhances h → Zγ to the measured value, but keeps the amplitude of h → γγ close to its SM prediction. We also comment on the phenomenology associated with these new fermions.

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The SM expected branching ratio for h → γγ and an excess for h → Zγ

He,

Huang,

et al. 2024

J. High Energ. Phys.

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Novel two component dark matter features in the Z2 × Z2 3HDM

Boto,

Figueiredo,

Romão

et al. 2024

J. High Energ. Phys.

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We discuss the constraints and phenomenology of the ℤ2 × ℤ2 three Higgs doublet model (3HDM) with two inert scalars, originating two dark matter (DM) particles. We elucidate the competing vacua and we submit the model to all theoretical and current experimental constraints. We find unexplored regions of parameter space and investigate their experimental signatures. In particular, we find regions where the two DM particles contribute equally to the relic DM density.

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Combining evolutionary strategies and novelty detection to go beyond the alignment limit of the Z3 3HDM

Crispim Romão,

Crispim Romão

2024

Phys. Rev. D

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We present a novel artificial intelligence approach for beyond the Standard Model parameter space scans by augmenting an evolutionary strategy with novelty detection. Our approach leverages the power of evolutionary strategies, previously shown to quickly converge to the valid regions of the parameter space, with a novelty reward to continue exploration once converged. Taking the Z3 3HDM as our physics case, we show how our methodology allows us to quickly explore highly constrained multidimensional parameter spaces, providing up to eight orders of magnitude higher sampling efficiency when compared with pure random sampling and up to four orders of magnitude when compared to random sampling around the alignment limit. In turn, this enables us to explore regions of the parameter space that have been hitherto overlooked, leading to the possibility of novel phenomenological realizations of the Z3 three Higgs doublet model that had not been considered before. Published by the American Physical Society 2024

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New physics interpretations for nonstandard values of h→Zγ

Cited by 8 publications

References 27 publications

The SM expected branching ratio for h → γγ and an excess for h → Zγ

The SM expected branching ratio for h → γγ and an excess for h → Zγ

Novel two component dark matter features in the Z2 × Z2 3HDM

Combining evolutionary strategies and novelty detection to go beyond the alignment limit of the Z3 3HDM

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