N³LO kick-off workstop / thinkstart

3 Aug 2022, 09:00 → 5 Aug 2022, 22:00 Europe/London

OC218 (IPPP)

Yannick Ulrich (University of Durham)

Recent progress at NNLO suggests that a fully differential N³LO calculation of γ*→ll should be possible. IPPP will host a three-day in-person kick-off workstop to try and organise the different contributions. We will cover

• VVV: the three-loop heavy-quark / heavy-lepton form factor (massification, exact, semi-numerical, etc.)
• RVV: adapting γ*→qqg, new calculations, mass dependence
• RRV: automation, numerical stability
• assembly & dirty tricks: Monte Carlo, massification, jettification, NTS stabilisation etc.
• open discussion

Each area will be given half a day, starting with an open 1h seminar followed by a lengthy discussion.

Just like previous workstops, we try to gather a small number of theorists who actively work on this topic to make very concrete progress. It should not just be about giving talks, but to actually learn from each other and put together the jigsaw pieces.

conference-photo.jpg

program.pdf

Wednesday, 3 August

10:00 → 10:30 Welcome

Speaker: Yannick Ulrich (University of Durham)

10:30 → 13:00 Open Discussion: Motivations and goal

10:30 Motivations and goal

Speaker: Yannick Ulrich (University of Durham)

welcome.pdf

11:00 Coffee & Tea break

13:00 → 14:00 Lunch

14:00 → 18:00 VVV

the three-loop heavy-quark / heavy-lepton form factor (massification, exact, semi-numerical, etc.)

14:00 Seminar: Three loop corrections for the QCD and QED form factors

• the details our calculation of hep-ph/2202.05276, in particular the semi-analytic method employed for the MIs and the optimization of the MI basis.
• discuss the possible implementation in a C++/Fortran code, what is necessary for the Monte Carlo and which features you require.
• discuss  which contributions with closed fermion loops and hadronic vacuum polarization would be necessary to calculate.

Speakers: Fabian Lange (KIT), Kai Schoenwald (KIT), Matteo Fael (KIT Karlsruhe)

durham.pdf

Fael_DurhamFFN3LO.pdf

Workstop_VVV_Lange.pdf

15:00 Coffee & Tea break

Thursday, 4 August

09:00 → 13:00 RVV

adapting γ*→qqg, new calculations, mass dependence

09:00 Seminar: Two-Loop amplitudes via the AIDA framework

Speaker: Jonathan Ronca (INFN - Sezione Napoli)

Talk_Durham_Ronca_2022.pdf

09:30 Seminar: analytic two loop amplitudes from finite fields

Speakers: Ryan Moodie (Turin University), Ryan Moodie (University of Turin)

slides.pdf

10:00 Coffee & Tea break

13:00 → 14:00 Lunch

14:00 → 18:00 RRV

automation, numerical stability

14:00 Seminar: OpenLoops (current and upcoming IR stability developments at one-loop)

Speakers: Jonas Lindert (IPPP), Natalie Schär, Jonas Lindert (University of Sussex )

YannickWorkshop_NSJL.pdf

15:00 Coffee & Tea break

18:30 → 22:00 Conference Dinner

Friday, 5 August

09:00 → 12:30 assembly & dirty tricks

Monte Carlo, massification, jettification, NTS stabilisation etc.

09:00 Seminar: McMule Approach to/at N3LO (Pt. 1)

Speaker: Marco Rocco (PSI)

fks3.pdf

09:30 Seminar: McMule Approach to/at N3LO (Pt. 2)

Speaker: Tim Engel (Paul Scherrer Institute & University of Zurich)

massification_realcorr.pdf

10:00 Coffee & Tea break

12:30 → 13:30 Lunch

13:30 → 16:30 Open Discussion: Summary & Homework, departure & sightseeing

13:30 Summary & Homework

Speaker: Adrian Signer

homework-board.jpg

questions.jpg