RADCOR 2019

Session

Tuesday Afternoon B

10 Sept 2019, 14:30

Cubiculaire

Conveners

Tuesday Afternoon B

• Einan Gardi (The University of Edinburgh (GB))

Tuesday Afternoon B

• Massimiliano Grazzini (Universitaet Zuerich (CH))

85. Soft gluon resummation for the associated top-pair quark production at the LHC

Anna Kulesza

10/09/2019, 14:30

The studies of the associated production processes of a top-quark pair with a colour-singlet boson, e.g. Higgs, W or Z, are among the highest priorities of the LHC programme. Correspondingly, improvements in precision of theoretical predictions for these processes are of central importance. In this talk, we review the latest results on resummation of soft gluon corrections. The resummation is...

32. Wilson-line geometries and the relation between IR singularities of form factors and the large-x limit of DGLAP splitting functions

Calum Milloy (University of Edinburgh)

10/09/2019, 15:00

We discuss the relation between the infrared singularities of on-shell partonic form factors and parton distribution functions (PDFs) near the elastic limit, through their factorisation in terms of Wilson-line correlators. Ultimately we identify the difference between the anomalous dimension controlling single poles of these two quantities to all loops in terms of the closed parallelogram...

87. The role of soft quarks in next-to-leading power threshold effects

Melissa van Beekveld (R)

10/09/2019, 15:30

Cross-sections in perturbative QCD are plagued by large corrections from soft and collinear radiation. The most singular terms are known to be universal, which allows their resummation to all orders in the coupling. In our work, we have examined the structure of the next-to-singular contributions, which can originate from the emission of both soft quarks and gluons. In this talk, I will show...

44. Threshold effects at next-to-leading power

Mr Jort Sinninghe Damsté (University of Amsterdam)

10/09/2019, 16:00

In QCD, soft radiation plays an important role in kinematic regions where resulting threshold logarithms become large. In this talk, I address such effects beyond leading power in the threshold expansion, for both fixed order and resummed results. For the double-real single-virtual correction to Drell-Yan, a large class of next-to-leading power (NLP) threshold logarithms is shown
to be...

56. Rational terms in two-loop calculations

Max Zoller (UZH)

10/09/2019, 17:00

Recently, we published the OpenLoops 2 program, a powerful tool for the automation of NLO QCD and NLO EW calculations for all relevant LHC processes with high numerical stability in hard regions as well as in soft and collinear regions. This not only allows for highly efficient and accurate NLO calculations, but also for the numerically stable computation of NNLO real-virtual contributions....

11. QED challenges at FCC-ee precision measurements

Prof. Jadach Stanislaw (IFJ PAN, Kraków)

10/09/2019, 17:30

E

The expected experimental precision of the rates and asymmetries
in the Future Circular Collider with electron positron beams (FCC-ee)
in the energy range 88-365GeV considered for construction in CERN,
will be better by a factor 5-200.
This will be thanks to very high luminosity,
factor up to $10^5$ higher than in the past LEP experiments.
This poses the extraordinary challenge of...

26. The O(alpha^2) Initial State QED Corrections to e+ e- Annihilation into a Neutral Vector Boson Revisited

Kay Schönwald (DESY)

10/09/2019, 18:00

At $e^+ \, e^-$ colliders the QED--initial state radiation forms a large part of the radiative corrections. Their
precise and fast evaluation is an essential asset for the experiments at LEP, the ILC and the FCC-ee, operating at
high luminosity. A long standing problem in the analytic understanding of the $\mathcal{O}(\alpha^2)$ initial state
radiation is the observed discrepancy between...