RADCOR 2019

Session

Friday Morning

Sep 13, 2019, 9:00 AM

Chambre du Trésorier

Conveners

Friday Morning

• Gang Yang

Friday Morning

• Gang Yang

81. Generalized hypergeometric functions and intersection theory for Feynman integrals

Ruth Britto (Trinity College Dublin)

9/13/19, 9:00 AM

Feynman integrals that have been evaluated in dimensional regularization can be written in terms of generalized hypergeometric functions. It is well known that properties of these functions are revealed in the framework of intersection theory. We propose further applications of intersection theory in the case of functions associated to positive geometries, in particular to construct a...

5. Higher order corrections to Higgs boson pair production

Matthias Steinhauser (KIT)

9/13/19, 9:30 AM

H

In this talk we discuss NNLO and N3LO order corrections
to the process gg->HH in the Standard Model. In particular,
we consider three-loop corrections to the form factors entering the virtual
corrections in the large-mt
limit and compute five expansion terms.
In the same approximation we also evaluate the
real radiation corrections at NNLO. Finally, we present
a building block for the...

35. Matter dependence of the four-loop cusp anomalous dimension

Maximilian Stahlhofen (JGU Mainz)

9/13/19, 10:00 AM

The cusp anomalous dimension is a universal and ubiquitous quantity in QCD. It governs the IR structure of scattering amplitudes and is the key ingredient to (Sudakov) resummation for high-energy collider processes. I will report on recent analytic results on the matter dependence of the cusp anomalous dimension at four loops and discuss the calculational methods used to obtain them.

29. Binary Black Holes and Scattering Amplitudes

Mikhail Solon

9/13/19, 11:00 AM

We combine tools from the modern amplitudes program and effective field theory to develop a systematic and scalable method for deriving classical dynamics for binary systems from on-shell scattering. Applying this to gravitationally interacting massive scalars yields the first derivation of the conservative Hamiltonian for compact spinless binaries at third post-Minkowskian order. The...

40. N3LO predictions for the decay of the Higgs boson to bottom quarks

Mr Roberto Mondini (University at Buffalo)

9/13/19, 11:30 AM

We present a fully-differential calculation of the $H \to b\overline{b}$ decay at next-to-next-to-next-to-leading order (N3LO) accuracy. Our calculation considers diagrams in which the Higgs boson couples directly to the bottom quarks. In order to regulate the infrared divergences present at this order we use the Projection-to-Born technique coupled with N-jettiness slicing. After validating...

47. Photon pair production in gluon fusion: Top quark threshold effects

Long Chen (Max Planck Institute for Physics)

9/13/19, 12:00 PM

We present a calculation of the NLO QCD corrections to the loop-induced production of a photon pair through gluon fusion, including massive top quarks at two loops, where the two-loop integrals are calculated numerically. Matching the results for the virtual amplitude to a threshold expansion, we obtain accurate results around the top quark pair production threshold. We analyse how the top...

98. The four-loop slope of the Dirac form factor

Dr Stefano Laporta (University of Padova)

9/13/19, 12:30 PM

I this talk I will show the result of the 1100-digits calculation of the 4-loop QED contribution to the first derivative of the Dirac form factor at zero momentum transfer. An analytical fit has been obtained, and I will describe its structure. I will discuss also the contribution of this result to the Lamb shift of hydrogen.