564 citations · 1.4k across the 31 of their papers we have counts for
32 papers
Radiative pion-pair production in disperon QED
Yizhou Fang, Sophie Kollatzsch, Adrian Signer +1
Based on the previously developed disperon QED method for incorporating data input into loop processes in Monte Carlo codes, we calculate at NLO and include the pion vec…
Two-loop tensor integral reduction for automated tools
Fabian Lange, Max F. Zoller
In order to exploit the full potential of the LHC and future colliders, high-precision calculations of a very wide range of observables are crucial. Automated tools for next-to-nex…
Recursive reduction of two-loop tensor integrals
Fabian Lange, Max F. Zoller
In order to meet the precision requirements for the LHC and future colliders, next-to-next-to-leading order corrections to a wide range of processes are essential, making general a…
Disperon QED
Yizhou Fang, Sophie Kollatzsch, Marco Rocco +3
We present disperon QED, a method to deal with data input in loop processes in Monte Carlo codes. It relies on dispersion relations, automated tools such as OpenLoops, effective fi…
Status of two-loop automation in OpenLoops
Natalie Schär, Max F. Zoller
The calculation of hard scattering amplitudes up to NLO is automated in numerical tools, such as OpenLoops. The LHC and future experiments, however, demand high-precision predictio…
Muon-electron scattering at NNLO
A. Broggio, T. Engel, A. Ferroglia +8
We present the first calculation of the complete set of NNLO QED corrections for muon-electron scattering. This includes leptonic, non-perturbative hadronic, and photonic contribut…
Towards two-loop automation in OpenLoops
Stefano Pozzorini, Natalie Schär, Max F. Zoller
NLO scattering amplitudes are provided by fully automated numerical tools, such as OpenLoops, for a very wide range of processes. In order to match the numerical precision of curre…
Two-loop amplitude generation in OpenLoops
Stefano Pozzorini, Natalie Schär, Max F. Zoller
Numerical tools, such as OpenLoops, provide NLO scattering amplitudes for a very wide range of hard scattering amplitudes in a fully automated way. In order to match the numerical…
Two-loop tensor integral coefficients in OpenLoops
Stefano Pozzorini, Natalie Schär, Max F. Zoller
We present a new and fully general algorithm for the automated construction of the integrands of two-loop scattering amplitudes. This is achieved through a generalisation of the op…
Two-Loop Rational Terms for Spontaneously Broken Theories
Jean-Nicolas Lang, Stefano Pozzorini, Hantian Zhang +1
Rational counterterms are a key ingredient for the automation of loop calculations through numerical methods. Building on the recently established properties of rational terms of U…
Two-Loop Rational Terms in Yang-Mills Theories
Jean-Nicolas Lang, Stefano Pozzorini, Hantian Zhang +1
Scattering amplitudes in dimensions involve particular terms that originate from the interplay of UV poles with the dimensional parts of loop numerators. Such contributio…
Rational terms in two-loop calculations
Stefano Pozzorini, Hantian Zhang, Max F. Zoller
We present an extension of the renormalisation procedure based on the R-operation in dimensions at two-loop level, in which the numerators of all Feynman diagrams can be constr…
Rational Terms of UV Origin at Two Loops
Stefano Pozzorini, Hantian Zhang, Max F. Zoller
The advent of efficient numerical algorithms for the construction of one-loop amplitudes has played a crucial role in the automation of NLO calculations, and the development of sim…
NLO QCD predictions for production in association with a light jet at the LHC
Federico Buccioni, Stefan Kallweit, Stefano Pozzorini +1
Theoretical predictions for ttbb production are of crucial importance for ttH measurements in the H->bb channel at the LHC. To address the large uncertainties associated with the m…
OpenLoops 2
Federico Buccioni, Jean-Nicolas Lang, Jonas M. Lindert +4
We present the new version of OpenLoops, an automated generator of tree and one-loop scattering amplitudes based on the open-loop recursion. One main novelty of OpenLoops 2 is the…
On-the-fly reduction of open loops
Federico Buccioni, Jean-Nicolas Lang, Stefano Pozzorini +2
We describe new developments in the OpenLoops framework based on the recently introduced on-the-fly method. The on-the-fly approach exploits the factorisation of one-loop diagrams…
A new method for one-loop amplitude generation and reduction in OpenLoops
Federico Buccioni, Stefano Pozzorini, Max Zoller
We describe a new method for the automated construction of one-loop amplitudes based on the open-loop algorithm, where various operations are performed on-the-fly while constructin…
On-the-fly reduction of open loops
Federico Buccioni, Stefano Pozzorini, Max Zoller
Building on the open-loop algorithm we introduce a new method for the automated construction of one-loop amplitudes and their reduction to scalar integrals. The key idea is that th…
Four-loop renormalization of QCD with a reducible fermion representation of the gauge group: anomalous dimensions and renormalization constants
K. G. Chetyrkin, M. F. Zoller
We present analytical results at four-loop level for the renormalization constants and anomalous dimensions of an extended QCD model with one coupling constant and an arbitrary num…
Four-loop QCD -function with different fermion representations of the gauge group
M. F. Zoller
We present analytical results at four-loop level for the -function of the coupling of a generic gauge group and any number of different quark representations. From this we can d…
Leading QCD-induced four-loop contributions to the -function of the Higgs self-coupling in the SM and vacuum stability
K. G. Chetyrkin, M. F. Zoller
We present analytical results for the leading top-Yukawa and QCD contribution to the -function for the Higgs self-coupling of the Standard Model at four-loop level, namely t…
On the renormalization of operator products: the scalar gluonic case
Max F. Zoller
In this paper we study the renormalization of the product of two operators in QCD. An insertion of two such operators into a Greens f…
Top-Yukawa effects on the -function of the strong coupling in the SM at four-loop level
M. F. Zoller
We present analytical results for the QCD -function extended to the gaugeless limit of the unbroken phase of the Standard Model at four-loop level. Apart from the strong couplin…
Standard Model beta-functions to three-loop order and vacuum stability
Max F. Zoller
Since the discovery of a Higgs particle the effective Higgs potential of the Standard Model or extensions and the stability of the ground state corresponding to its minimum at the…