K. Kampf

collaborators

3 papers

hep-th2025

Positive Geometry for Stringy Scalar Amplitudes

Christoph Bartsch, Karol Kampf, David Podivin +1

We introduce a new positive geometry, the associahedral grid, which provides a geometric realization of the inverse string theory KLT kernel. It captures the full $α^{'}$ -dependence o…

hep-ex2025

Searches for hidden sectors using $K^{+} \to π^{+} X$ decays

NA62 Collaboration

Results from the study of the rare decays $K^{+} \to π^{+} ν ν ˉ$ , $K^{+} \to π^{+} μ^{+} μ^{-}$ and $K^{+} \to π^{+} γ γ$ at the NA62 experiment at CERN are interpreted in terms…

hep-th2025

Soft Factor Structure of MHV Amplitudes for Massless Charged Particles

Christoph Bartsch, Karol Kampf, David Podivín

We present a simple derivation of MHV amplitudes in massless spinor and scalar electrodynamics. Working with permutationally invariant amplitudes, we show that they are fully deter…

Positive Geometry for Stringy Scalar Amplitudes

Searches for hidden sectors using K+→π+X decays

Soft Factor Structure of MHV Amplitudes for Massless Charged Particles

Searches for hidden sectors using $K^{+} \to π^{+} X$ decays