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Hadronic Decays of a Higgs-mixed Scalar

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arxiv 2407.13587 v1 pith:I7NTM3X4 submitted 2024-07-18 hep-ph hep-ex

Patrick J. Blackstone , Jaume Tarrús Castellà , Emilie Passemar , Jure Zupan This is my paper · ORCID
classification hep-phhep-ex
keywords scalardecayslighthiggs-mixedcouplingshadronicmodelresults
verification ladder T0 review T1 audit T2 compute T3 formal

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One of the portals to new physics is a light scalar coupled to the Standard Model (SM) Higgs. In this paper we focus on hadronic decays of such a scalar in the regime where QCD dynamics is nonperturbative, resulting, e.g., in decays to pairs of pions or kaons, while also allowing for scalar couplings to the SM fermions to deviate from the Higgs-mixed light scalar limit. Representations of the corresponding form factors can be obtained using dispersive techniques, however, several sources of uncertainty affect the final results. We reexamine these decays, paying special attention to the quantification of uncertainties. For the light Higgs-mixed scalar scenario, we compare our results with previous works. For a general set of couplings of the light scalar to Standard Model fields, we provide a public code, {\tt hipsofcobra}, to compute the decay widths.

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Cited by 4 Pith papers

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  1. Dark Higgs-strahlung at Belle II: A distinctive dark sector signature with displaced vertices and missing energy

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    Dark Higgs-strahlung, with or without an initial-state photon, gives a displaced-vertex plus missing-energy signature that could make Belle II more sensitive to dark photon models than single-photon searches alone.

  2. Flavor at FASER: Discovering Light Scalars Beyond Minimal Flavor Violation

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    Flavored scalar models with a Froggatt-Nielsen symmetry make D-meson decays a major production source for long-lived scalars at FASER/FASER2, with reach presented model-independently in branching fraction and lifetime...

  3. micrOMEGAs 7: Beyond standard cosmology

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    The micrOMEGAs dark-matter package now solves Boltzmann equations with user-defined expansion and entropy histories, adds sub-GeV hadronic annihilation, and updates CMB, dwarf-galaxy, LZ, and CMS constraints.

  4. Scalar and tensor meson dominance and gravitational form factors of the pion

    hep-ph 2024-11 conditional novelty 5.0 of 10

    Monopole fits to lattice pion gravitational form factors support scalar f0(600) and tensor f2(1270) meson dominance, yield chiral LECs and D(0)=-0.95(3), and expose sum-rule violations needing negative spectral strength.

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