Michael A. Schmidt

activity

20232026

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4 papers · 1 filter

hep-ph2026

Constraints on invisible $B^{+} \to K^{+} X$ decays from the Belle II $B^{+} \to K^{+} ν ν ˉ$ measurement

Lorenz Gärtner, Nikolai Krug, Thomas Kuhr +3

The Belle II measurement of the branching fraction for $B^{+} \to K^{+} ν ν ˉ$ shows a $2.7 σ$ excess over the Standard Model prediction and motivates new-physics explanations such as…

hep-ph2025

Monojet and direct detection constraints on real scalar dark matter: EFT and a simple UV completion

Arnab Roy, Michael A. Schmidt, German Valencia

We consider constraints that can be placed on certain invisible scalar particles through monojet studies at the LHC and compare them with those from direct detection experiments wh…

hep-ph2024

Scalar dark matter explanation of the excess in the Belle II $B^{+} \to K^{+} +$ invisible measurement

Xiao-Gang He, Xiao-Dong Ma, Michael A. Schmidt +2

Recently Belle II reported the first measurement of $B^{+} \to K^{+} + invisible (inv)$ , which is $2.7 σ$ above the standard model (SM) prediction. If confirmed, this calls for new p…

hep-ph2023

Z and Higgs boson decays with doubly-charged scalars at one-loop: current constraints, future sensitivities, and application to lepton-triality models

Gabriela Lichtenstein, Michael A. Schmidt, German Valencia +1

We analyse the $Z$ and Higgs boson decays $Z \to ℓ^{+} ℓ^{-}$ ( $ℓ = e, μ, τ$ ), $H \to γ γ$ and $H \to Z γ$ that are induced at one-loop level in models with a doubly-charged isosin…

Constraints on invisible B+→K+X decays from the Belle II B+→K+ννˉ measurement

Monojet and direct detection constraints on real scalar dark matter: EFT and a simple UV completion

Scalar dark matter explanation of the excess in the Belle II B+→K++ invisible measurement

Z and Higgs boson decays with doubly-charged scalars at one-loop: current constraints, future sensitivities, and application to lepton-triality models

Constraints on invisible $B^{+} \to K^{+} X$ decays from the Belle II $B^{+} \to K^{+} ν ν ˉ$ measurement

Scalar dark matter explanation of the excess in the Belle II $B^{+} \to K^{+} +$ invisible measurement