Radiative corrections and Monte Carlo tools for low-energy hadronic cross sections in $e^+e^-$ collisions

7 Jun 2023, 14:00 → 9 Jun 2023, 18:00 Europe/Zurich

KOL-F-101 (University of Zurich)

Adrian Signer (PSI - Paul Scherrer Institut), Yannick Ulrich (University of Durham), Andrzej Kupsc, Graziano Venanzoni (University of Liverpool)

This hybrid conference acts as a satellite event to the 5^th workstop/thinkstart and aims to collect some community input and form new collaboration.

Wednesday, 7 June

14:00 → 15:30 Introduction and overview

14:00 Overview $g-2$

Speaker: Martin Hoferichter (Unversity of Bern)

Talk_hoferichter.pdf

15:00 Workstop/thinkstart activities: towards a NNLO MC generator for low-energy $e^+e^-\to$ hadrons

Speaker: Graziano Venanzoni (University of Liverpool)

gv_zurich_070623.pdf

15:30 → 16:00 Coffee break

16:00 → 17:50 Experiments

16:00 Experimental overview

Speaker: Anna Driutti (University and INFN Pisa)

Experiments_Zurich.pdf

16:50 Feasibility Studies for an Inclusive $R$-Measurement using ISR with BESIII

Speaker: Thomas Lenz (JGU Mainz)

Lenz_R_incl_ISR_BESIII.pdf

17:20 CMD-3

Speaker: Fedor Ignatov (University of Liverpool)

pipiFinal_7June2023_ZurichRadcorMC.pdf

Thursday, 8 June

14:00 → 15:30 Hadrons

14:00 Status of dispersive approach

Speaker: Prof. Thomas Teubner (University of Liverpool)

tteubner_Zurich_June2023.pdf

14:50 Lattice overview

Speaker: Letizia Parato (ETH Zurich)

uzh_parato.pdf

15:30 → 16:00 Coffee break

16:00 → 16:30 Hadrons

16:00 WP3: Processes with hadrons

Speaker: Peter Stoffer (UZH and PSI)

Summary-WP3.pdf

16:30 → 18:00 Loops in QED

16:30 WP1: leptonic processes at NNLO & beyond

Speaker: William Torres Bobadilla (Max-Planck-Institut für Physik)

Zurich2_2023.pdf

16:45 WP2: Form factor contributions at N$^3$LO

Speaker: Tim Engel (Uni Freiburg)

conference_WP2_summary.pdf

17:10 $e^+e^-\to\gamma\gamma^*$ at two loops in massless QED

We present an analytic computation of $e^+e^-\to\gamma\gamma^*$ at two loops in massless QED. We reconstruct the analytic form of the amplitudes from numerical evaluations over finite fields. We express the integrals in a basis of Goncharov polylogarithms to obtain compact expressions. These contributions are required for N$^3$LO predictions of the inclusive process $e^+e^-\to\gamma^*$ and for NNLO corrections for ISR measurements of $e^+e^-\to\gamma\gamma^*$.

Speaker: Ryan Moodie (Turin University)

slides.pdf

Friday, 9 June

14:00 → 15:00 Parton showers

14:00 WP4: parton shower

Speaker: Carlo Carloni Calame (INFN, Pavia (IT))

ccarlonicalame.pdf

14:30 Photon splitting corrections to soft-photon resummation

In this talk I will motivate the importance of including QED corrections in a systematic and automated manner. I will present an algorithm to add photon-splitting corrections to the Yennie-Frautschi-Suura-style soft-photon resummation available in the Sherpa Monte-Carlo event generator. Then, I will introduce different lepton dressing strategies which incorporate further leptons and hadrons in addition to the customary photons, and discuss their sensitivity to dressing parameters such as the cone size. I will then present some results for academic and realistic setups.

Speaker: Lois Flower (Durham University)

Workstop_Zurich_2023-v2.pdf

15:00 → 16:10 MUonE

15:00 Experimental MUonE

Speakers: Giovanni Abbiendi (INFN Bologna), Giovanni Abbiendi (INFN Bologna)

2023.06.09_GAbbiendi_MUonE_Strong2020-ZH.pdf

15:30 Lattice MUonE

Speaker: Javad Komijani (ETH Zurich)

Jkomijani_MUonE.pdf

15:50 Theoretical MUonE

Speaker: Marco Rocco (PSI - Paul Scherrer Institut)

mr-strong2020.pdf

16:10 → 17:00 Closing remarks and drinks