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

1 Welcome

Speaker: Yannick Ulrich (University of Durham)

Open Discussion: Motivations and goal

2 Motivations and goal

Speaker: Yannick Ulrich (University of Durham)

welcome.pdf

11:00 Coffee & Tea break

13:00 Lunch

VVV

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

3 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

RVV

adapting γ*→qqg, new calculations, mass dependence

4 Seminar: Two-Loop amplitudes via the AIDA framework

Speaker: Jonathan Ronca (INFN - Sezione Napoli)

Talk_Durham_Ronca_2022.pdf

5 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 Lunch

RRV

automation, numerical stability

6 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

7 Conference Dinner

Friday 5 August

assembly & dirty tricks

Monte Carlo, massification, jettification, NTS stabilisation etc.

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

Speaker: Marco Rocco (PSI)

fks3.pdf

9 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 Lunch

Open Discussion: Summary & Homework, departure & sightseeing

10 Summary & Homework

Speaker: Adrian Signer

homework-board.jpg

questions.jpg