39 citations · 59 across the 11 of their papers we have counts for
12 papers
New Tools in the Landau Bootstrap
Piotr Bargieła, Giulio Crisanti, Craig Larkin +4
We describe recent advances in our understanding of the analytic structure of Feynman integrals. In particular, we describe two new classes of constraints on such integrals, that i…
All-loop four-quark Bethe-Salpeter kernel
Piotr Bargiela
We analytically calculate the all-loop bare perturbative part of the four-quark Bethe-Salpeter kernel using modern scattering amplitude methods. We work to subleading order in the…
The spectrum of Feynman-integral geometries at two loops
Piotr Bargiela, Hjalte Frellesvig, Robin Marzucca +4
We provide a complete classification of the Feynman-integral geometries at two-loop order in four-dimensional Quantum Field Theory with standard quadratic propagators. Concretely,…
The integrand form of infrared singularities of two-loop QCD scattering amplitudes
Piotr Bargiela
In this work, we express the singular part of a scattering amplitude in terms of Feynman integrals compatible with topologies appearing in the bare amplitude, and we choose a basis…
On the finite basis of two-loop `t Hooft-Veltman Feynman integrals
Piotr Bargiela, Tong-Zhi Yang
In this work, we investigate the finite basis topologies of two-loop dimensionally regularized Feynman integrals in the `t Hooft-Veltman scheme in the Standard Model. We present a…
On the finite basis topologies for multi-loop high-multiplicity Feynman integrals
Piotr Bargiela, Tong-Zhi Yang
In this work, we systematically analyse Feynman integrals in the `t Hooft-Veltman scheme. We write an explicit reduction resulting from partial fractioning the high-multiplicity in…
Integrated Unitarity for Scattering Amplitudes
Piotr Bargiela
We present a new method for computing multi-loop scattering amplitudes in Quantum Field Theory. It extends the Generalized Unitarity method by constraining not only the integrand o…
Two-loop mixed QCD-electroweak amplitudes for jet production at the LHC: bosonic corrections
Piotr Bargiela, Fabrizio Caola, Herschel Chawdhry +1
We present a calculation of the bosonic contribution to the two-loop mixed QCD-electroweak scattering amplitudes for -boson production in association with one hard jet at hadron…
High-precision scattering amplitudes for LHC phenomenology
Piotr Bargiela
In this work, we consider scattering amplitudes relevant for high-precision Large Hadron Collider (LHC) phenomenology. We analyse the general structure of amplitudes, and we review…
Signal-background interference effects in Higgs-mediated diphoton production beyond NLO
Piotr Bargiela, Federico Buccioni, Fabrizio Caola +3
In this paper we consider signal-background interference effects in Higgs-mediated diphoton production at the LHC. After reviewing earlier works that show how to use these effects…
Three-loop four-particle QCD amplitudes
Piotr Bargiela
We present recent advancements in the computation of three-loop four-particle helicity amplitudes in full-color massless QCD. In this contribution, we focus on the proc…
Three-loop helicity amplitudes for diphoton production in gluon fusion
Piotr Bargiela, Fabrizio Caola, Andreas von Manteuffel +1
We present a calculation of the helicity amplitudes for the process in three-loop massless QCD. We employ a recently proposed method to calculate scattering amplitudes in…