Imprints of causality on the S-matrix remain largely mysterious. In fact, there is not even an
agreed-upon definition of what causality is supposed to entail in the first place, with different …

Les Houches activities in 2021 were truncated due to the lack of an in-person component.
However, given the rapid progress in the field and the restart of the LHC, we wanted to …

An impressive effort is being pursued in order to develop new strategies that allow an
efficient computation of multi-loop multi-leg Feynman integrals and scattering amplitudes …

A bstract We present a novel benchmark application of a quantum algorithm to Feynman
loop integrals. The two on-shell states of a Feynman propagator are identified with the two …

The spinor-helicity formalism has proven to be very efficient in the calculation of scattering
amplitudes in quantum field theory, while the loop-tree duality (LTD) representation of …

We propose multiloop vacuum amplitudes in the loop-tree duality (LTD) as the optimal
building blocks for efficiently assembling theoretical predictions at high-energy colliders …

We present a variational quantum eigensolver (VQE) algorithm for the efficient bootstrapping
of the causal representation of multiloop Feynman diagrams in the loop-tree duality or …

We study scalar one-loop amplitudes in massive ϕ 3-theory within causal loop-tree duality.
We derive a recurrence relation for the integrand of the amplitude. The integrand is by …

A bstract We derive a variant of the loop-tree duality for Feynman integrals in the Schwinger
parametric representation. This is achieved by decomposing the integration domain into a …

We employ implicit regularization (IReg) in quark-antiquark decays of the Z, or of a scalar
(CP-even or odd) boson at NLO, and compare with dimensional schemes to reveal …