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The 2026 Zhuhai Particle Physics and Cosmology Symposium (ZPCS 2026): Early Universe, Phase Transitions and Fundamental Symmetries

15–19 Oct 2026
Asia/Shanghai timezone

Session

Parallel Talks (3)

16 Oct 2026, 16:10

Presentation materials

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  1. 15. Floquet and Sideband Dynamics of Photon–Axion Mixing in Coherent Axion Backgrounds
    Run-Min Yao (HIAS, UCAS)
    16/10/2026, 16:10

    Coherent axion dark matter provides a periodically time-dependent background for electromagnetic propagation. In the presence of an external magnetic field, the oscillating axion field acts as a temporal pump and can drive photon–axion conversion beyond the conventional static or adiabatic level-crossing picture. A unified Floquet and sideband description of this dynamics will be...

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  2. 28. Energy-Correlator-Inspired Tau Polarimetry for Higgs CP and Electroweak Precision at Lepton Colliders
    Anjan Kumar Barik (TDLI)
    16/10/2026, 16:25

    The azimuthal angle difference between the decay planes of the two tau leptons
    in $h\to\tau^+\tau^-$ probes charge-parity (CP) violation in the
    Higgs-tau Yukawa coupling. In the dominant hadronic channel
    $\tau^\pm\to\rho^\pm\nu$, the spin-analyzing power is suppressed by the
    mixture of longitudinal and transverse $\rho$ polarizations. We propose an
    energy-correlator-inspired method that...

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  3. 38. Two-loop QCD corrections to $H \to b +\bar{ b} + g at higher powers in the dimensional regulator
    Chinmoy Dey (Tsung-Dao Lee Institute, SJTU)
    16/10/2026, 16:40

    We compute the two-loop massless QCD corrections to the amplitude of Higgs
    boson decay to bottom quark pair and a gluon ($H → b + \bar{b} + g$) in the higher powers of the dimensional regularization parameter $\epsilon$. The calculation is performed by projecting the amplitude onto the appropriate Lorentz structures related to the process. We also show the numerical behaviour of the form...

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  4. 34. Probing a First-Order Electroweak Phase Transition with Long-Lived Scalars at CEPC
    Xinchen Li (上海交通大学李政道研究所)
    16/10/2026, 16:55

    Light scalar particles coupled through the Higgs portal provide a connection between collider physics and the thermal history of the early Universe. In the real singlet extension of the Standard Model, these particles can modify the Higgs potential and support a first-order electroweak phase transition. Small mixing with the Higgs can also make the light scalar long-lived, leading to displaced...

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  5. 37. Electroweak phase transitions in the complex triplet model: a 3D EFT study
    Qin Yu
    16/10/2026, 17:10

    The complex triplet extension of the Standard Model generates neutrino masses through the type-II seesaw mechanism and can alter the electroweak thermal history. In this talk, I will present an analysis based on dimensionally reduced three-dimensional effective field theories, with one-loop zero-temperature matching and two-loop thermal masses. We study two regimes distinguished by the thermal...

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  6. 47. Nonadiabatic Leptogenesis from B-L Higgs Portal Scalegenesis
    minmin Niu
    16/10/2026, 17:25

    We study nonadiabatic leptogenesis in a B-L Higgs portal scalegenesis framework which undergoes a strong supercooling cosmological phase transition of Coleman-Weinberg type. For the benchmark considered, we discuss a 10 TeV B-L breaking scenario and its phenomenological consequences at LHC versus consistency with success of the present nonperturbative leptogenesis.

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