Subtracting Infrared Singularities Beyond NLO

Abstract

Precise theoretical predictions for LHC observables are a crucial pre- requisite for the discovery of new physics. Such predictions require high- order perturbative calculations in the Standard Model, most notably in QCD. A key step in these calculations is the cancellation of infrared divergences, which arise from exchanges of virtual partons and from the integration over undetected real radiation. This problem is completely solved at next-to- leading order (NLO) in the QCD coupling, and several methods have been proposed and implemented to perform the cancellation at next-to-next-to- leading order (NNLO). The implementation of existing methods for generic processes at NNLO remains challenging, while extensions beyond NNLO are beginning to be studied.

The lack of striking signals of new physics in the experimental LHC results to date strongly suggests that possible Beyond-the-Standard-Model (BSM) effects will be accessible only through precision studies. Furthermore, as the LHC accumulates integrated luminosity and statistical errors are consequently reduced, the challenge for the theory community is to similarly reduce theoretical uncertainties. The subtraction of infrared singularities is a crucial ingredient to perform precise high-order calculation of collider observables. As several competing methods are being developed, the proposed workshop would be a timely and essential forum for addressing the technical issues facing the field, sharing ideas, and developing general and flexible tools to extend current ideas to more complicated process and higher orders.

The goal of the proposed workshop is to bring together the leading experts in the field, in particular the proponents of existing methods at NNLO, with the goal of

  • comparing existing methods and assessing their strengths and limitations;
  • quantifying the analytical and numerical challenges for the application of the proposed methods to general multi-jet QCD processes at NNLO;
  • preparing the ground for extensions of the method beyond NNLO;
  • studying the implications of all-order information from amplitude-level factorisation theorems for the problem of subtraction at high-orders.

Confirmed Speakers:

George Sterman (YITP, Stony Brook U)
Alexander Huss (CERN)
Bernhard Mistlberger (CERN)
Franz Herzog (Nikhef)
Massimiliano Grazzini (Zurich U)
German Rodrigo (Valencia)
Gabor Somogyi (Debrecen U)
Frank Petriello (Argonne & Northwestern U)
Sandro Uccirati (Turin U)
David Kosower (CEA, Saclay)
Michal Czakon (Aachen U)
Raoul Roentsch (Karlsruhe U)

Schedule:Indico page

Timetable

See the full timetable on Indico

Sessions

10 Apr 2018 09:30
Nested local subtractions for amplitudes: George Sterman

10 Apr 2018 11:00
Double differential predictions for Higgs boson production: Bernhard Mistlberger

10 Apr 2018 15:00
NNLO corrections using the Antenna Subtraction Formalism and applications: Alexander Huss

11 Apr 2018 09:30
Sector-improved residue subtraction: Michal Czakon

11 Apr 2018 11:00
Nested soft-collinear subtractions for NNLO calculations: Raoul Röntsch

11 Apr 2018 13:30
Power corrections in the N-jettiness subtraction formalism: Frank Petriello

11 Apr 2018 14:30
Recent developments in q_T subtraction: Massimiliano Grazzini

12 Apr 2018 09:30
Anatomy of CoLoRFulNNLO: Gabor Somogyi

12 Apr 2018 11:00
An analytic local sector subtraction at NNLO: Sandro Uccirati

12 Apr 2018 15:00
A geometric approach to IR subtraction for real radiation".: Franz Herzog

13 Apr 2018 09:30
Unsubtracting Infrared Singularities: Germán Rodrigo

13 Apr 2018 10:30
DIrect Solutions of IBP Systems: David Kosower

13 Apr 2018 13:00
Colloquium: Imaging fundamental processes. The story and stories of jets at accelerators: George Sterman

Other contributions

10 Apr / 10:30—11:00
Discussion (0h30′)
10 Apr / 12:00—12:30
Discussion (0h30′)
10 Apr / 13:30—15:00
Discussion (1h30′)
10 Apr / 16:00—17:00
Discussion (1h00′)
11 Apr / 10:30—11:00
Discussion (0h30′)
11 Apr / 12:00—12:30
Discussion (0h30′)
11 Apr / 15:30—17:00
Discussion (1h30′)
12 Apr / 10:30—11:00
Discussion (0h30′)
12 Apr / 12:00—12:30
Discussion (0h30′)
12 Apr / 13:30—15:00
Discussion (1h30′)
12 Apr / 16:00—17:00
Discussion (1h00′)
13 Apr / 11:30—12:00
Discussion (0h30′)
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Subtracting Infrared Singularities Beyond NLO

Higgs Centre Workshop
The Higgs Centre for Theoretical Physics
School of Physics and Astronomy
James Clerk Maxwell Building
Peter Guthrie Tait Road
Edinburgh
EH9 3FD
UK