Gudrun Hiller

activity

20222026

most citedTwo is better than one: The U-spin-CP anomaly in charm

22 citations · 44 across the 10 of their papers we have counts for

collaborators

10 papers

hep-ph2026

Constraining the real singlet extension of the Standard Model: implications for vacuum stability

Moritz Bosse, Gudrun Hiller, Daniel Litim +4

Amongst the simplest extensions of the Standard Model is the addition of a real singlet scalar field with profound phenomenological consequences. The singlet can catalyze a strong…

hep-ph2026

Constraining the real scalar singlet extension of the SM

Moritz Bosse, Gudrun Hiller, Daniel Litim +4

The real scalar singlet extension of the standard model provides a minimal framework in which the Higgs sector can realise a strong first-order electroweak phase transition and imp…

hep-ph2025

Probing invisible particles with charm

Gudrun Hiller, Dominik Suelmann

We point out opportunities to probe invisible particles, left- and right-handed neutrinos, axion-like particles (ALPs) and dark photons $(Z^{'})$ with rare decays of charm hadro…

hep-ph2025★ 2 cited

New opportunities for rare charm from $Z \to c c ˉ$ decays

Angelo Di Canto, Tabea Hacheney, Gudrun Hiller +4

We analyze the potential of rare charm decays as probes of new physics at a high-luminosity flavor facility operating at the $Z$ pole, such as the FCC-ee or CEPC. In particular, we…

hep-ph2025

BSM reach of rare charm decays, including the rising star $Λ_{c} \to p μ^{+} μ^{-}$

Hector Gisbert, Gudrun Hiller, Dominik Suelmann

We perform the first global fit of rare charm transitions using recent data on $D^{0} \to μ^{+} μ^{-}$ , $D^{+} \to π^{+} μ^{+} μ^{-}$ , $Λ_{c} \to p μ^{+} μ^{-}$ and $D^{0} \to π^{+} π^{-} μ^{+} μ^{-}$ decays, including angul…

hep-ph2024★ 11 cited

Effective field theory analysis of rare $∣Δ c ∣ = ∣Δ u ∣ = 1$ charm decays

Hector Gisbert, Gudrun Hiller, Dominik Suelmann

We perform a global analysis of $∣Δ c ∣ = ∣Δ u ∣ = 1$ transitions using recent data on $D^{0} \to μ^{+} μ^{-}$ , $D^{+} \to π^{+} μ^{+} μ^{-}$ , $Λ_{c} \to p μ^{+} μ^{-}$ , and $D^{0} \to π^{+} π^{-} μ^{+} μ^{-}$ decays…

hep-ph2024★ 1 cited

Vacuum Stability in the Standard Model and Beyond

Gudrun Hiller, Tim Höhne, Daniel F. Litim +1

We revisit the stability of the Standard Model vacuum, and investigate its quantum effective potential using the highest available orders in perturbation theory and the most accura…

hep-ph2023★ 1 cited

Old and new anomalies in charm

Rigo Bause, Hector Gisbert, Gudrun Hiller +3

The recent LHCb determination of the direct CP asymmetries in the decays $D^{0} \to K^{+} K^{-}, π^{+} π^{-}$ hints at a sizeable breaking of two approximate symmetries of the SM: CP and U-s…

hep-ph2023★ 7 cited

Implications of an enhanced $B \to K ν ν ˉ$ branching ratio

Rigo Bause, Hector Gisbert, Gudrun Hiller

Rare decays mediated by $b \to s ν ν ˉ$ transitions have been reported by the Belle II experiment. The branching ratio of the decay $B^{+} \to K^{+} ν ν ˉ$ is found to be enhanced…

hep-ph2022★ 22 cited

Two is better than one: The U-spin-CP anomaly in charm

Rigo Bause, Hector Gisbert, Gudrun Hiller +3

The recent measurement of the CP-asymmetry in the decay $D \to K^{+} K^{-}$ by LHCb, combined with $Δ A_{CP}$ , evidences a sizable CP-asymmetry in $D \to π^{+} π^{-}$ decays, which r…