2 citations · 2 across the 6 of their papers we have counts for
6 papers · 1 filter
A Surface Integrand for the Inverse KLT Kernel
Christoph Bartsch, Karol Kampf, Jiří Novotný +1
We propose a loop-level generalization of the inverse string theory Kawai-Lewellen-Tye (KLT) kernel: the planar inverse KLT integrand. The integrand is defined constructively via a…
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 -dependence o…
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…
Universality of Colored Scalars from the Stringy KLT Kernel
Christoph Bartsch, Karol Kampf, Jiří Novotný +1
A new perspective on the inverse string theory Kawai-Lewellen-Tye (KLT) kernel is provided which establishes the universality of scattering amplitudes in the bi-adjoint scalar (BAS…
Hidden Amplitude Zeros From Double Copy
Christoph Bartsch, Taro V. Brown, Karol Kampf +3
Recently, Arkani-Hamed et al. proposed the existence of zeros in scattering amplitudes in certain quantum field theories including the cubic adjoint scalar theory Tr(), the $S…
An All-loop Soft Theorem for Pions
Christoph Bartsch, Karol Kampf, Jiri Novotny +1
In this letter, we discuss a generalization of the Adler zero to loop integrands in the planar limit of the non-linear sigma model (NLSM). While possible to maintain at one…