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

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KOL-F-101 (University of 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)
Description

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

Participants
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  • Wednesday 7 June
    • Introduction and overview
      • 1
        Overview $g-2$
        Speaker: Martin Hoferichter (Unversity of Bern)
        Talk_hoferichter.pdf
      • 2
        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
      Coffee break
    • Experiments
  • Thursday 8 June
    • Hadrons
    • 15:30
      Coffee break
    • Hadrons
      • 8
        WP3: Processes with hadrons
        Speaker: Peter Stoffer (UZH and PSI)
        Summary-WP3.pdf
    • Loops in QED
      • 9
        WP1: leptonic processes at NNLO & beyond
        Speaker: William Torres Bobadilla (Max-Planck-Institut für Physik)
        Zurich2_2023.pdf
      • 10
        WP2: Form factor contributions at N$^3$LO
        Speaker: Tim Engel (Uni Freiburg)
        conference_WP2_summary.pdf
      • 11
        $e^+e^-\to\gamma\gamma^*$ 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
    • Parton showers
      • 12
        WP4: parton shower
        Speaker: Carlo Carloni Calame (INFN, Pavia (IT))
        ccarlonicalame.pdf
      • 13
        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
    • MUonE
    • 17
      Closing remarks and drinks
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