PSR21 - Parton Showers and Resummation









Note, due to the ongoing COVID-19 situation the PSR21 conference will be organised as an online meeting. We hope to have a face-to-face workshop in 2022 again.


The 2021 annual workshop on Parton Showers and Resummation will be held online, during May 25-27, 2021. It is organised jointly by the Institute for Theoretical Physics, University of Göttingen, and the IPPP Durham. The workshop brings together researchers interested in Monte Carlo generators and in particular parton showers, resummation techniques and QCD phenomenology, to present and discuss the latest developments and applications.

The workshop is free of registration fees. All talks will be given via zoom, the meeting link will be distributed soon.

  • Aayushi Singla
  • Aidin Masouminia
  • Alan Price
  • Alba Soto-Ontoso
  • Alessandro Broggio
  • Alexander Karlberg
  • Andrea Banfi
  • Andreas Papaefstathiou
  • Andreas van Hameren
  • Andrew Larkoski
  • Andrzej Siodmok
  • Armando Bermudez Martinez
  • Basem El-Menoufi
  • Bhuvaneshwari Kashi
  • Carlo Oleari
  • Chang Wu
  • Chinmoy Dey
  • Christian Preuss
  • Cody Duncan
  • Cong Zhang
  • Daniel Reichelt
  • Davide Napoletano
  • Davison Soper
  • Dingyu Shao
  • Enrico Bothmann
  • Gavin Bewick
  • Giovanni Limatola
  • Goutam Das
  • Gregory Soyez
  • Gurpreet Singh Chahal
  • Jennifer Smillie
  • Jeppe Rosenkrantz Andersen
  • Jinmian Li
  • Johannes Scheller
  • kajal samanta
  • Kevin Brune
  • Krzysztof Kutak
  • Leandro Cieri
  • Leonardo Vernazza
  • Luca Rottoli
  • Ludovic Scyboz
  • M C Kumar
  • Marek Schoenherr
  • Matthew Lim
  • Mees van Kampen
  • Melissa van Beekveld
  • Mrinal Dasgupta
  • Niklas Schwanemann
  • Paolo Torrielli
  • Patrick Kirchgaesser
  • Pedro Cal
  • Percy Cáceres
  • Pier Monni
  • Pratik Kafle
  • Rajneil Baruah
  • Ratan Sarkar
  • Rob Verheyen
  • Robert Szafron
  • Rok Medves
  • Rudi Rahn
  • Ryam Wood
  • Saad Nabeebaccus
  • Samuel Alipour-fard
  • Sara Taheri Monfared
  • Sebastian Jaskiewicz
  • Shabeeb Alalawi
  • Shafeeq Rahman Thottoli
  • Silvia Ferrario Ravasio
  • Simon Plätzer
  • Simone Alioli
  • Simone Amoroso
  • Solange Schrijnder van Velzen
  • Steffen Schumann
  • Torbjörn Lundberg
  • Torbjörn Sjöstrand
  • Wanli Ju
  • Wouter Waalewijn
  • Yair Mulian
  • Yang-Ting Chien
  • Yehudi Simon
  • Yibei Li
  • Zahra Abdy
  • Zoltan Nagy
    • 13:45 14:00
      Welcome note 15m
    • 14:00 15:30
      Talks: MC & Resummation overviews
      • 14:00
        MC generator overview 45m
      • 14:45
        Resummation overview 45m
        Speaker: Dr Andrea Banfi (University of Sussex)
    • 15:30 15:45
      Break 15m
    • 15:45 16:45
      Talks: Jet Substructure
      • 15:45
        Jet Substructure overview 30m
        Speaker: Andrew Larkoski (Reed Collge)
      • 16:15
        Groomed jet mass as a direct probe of collinear parton dynamics 15m
        Speaker: Basem El-Menoufi (The university of Manchester)
      • 16:30
        Dynamical grooming 15m
        Speaker: Alba Soto Ontoso (IPhT)
    • 16:45 17:00
      Break 15m
    • 17:00 18:35
      Talks: Resummation
      • 17:00
        Semi-analytic resummation in the Sherpa framework 15m
        Speaker: Daniel Reichelt
      • 17:15
        Next-to-leading non-global logarithms in QCD 15m
        Speakers: Andrea Banfi (University of Sussex) , Frederic Alexandre Dreyer (University of Oxford) , Pier Francesco Monni (CERN)
      • 17:30
        Non-global Logarithms Beyond Leading Colour 15m
        Speaker: Chang Wu (Università di Genova & INFN Genova)
      • 17:45
        Interplay between perturbative and non-perturbative effects with the ARES method 15m
        Speaker: Ryan Wood (University of Sussex)
    • 14:00 15:25
      Talks: Parton Showers
      • 14:00
        Electroweak corrections and multijet merging 20m
        Speaker: Enrico Bothmann (University of Göttingen)
      • 14:20
        The PanScale shower approach 20m
        Speaker: Pier Francesco Monni (CERN)
      • 14:40
        Boosted Higgs Production in Vector Boson Fusion 15m
        Speaker: Silvia Ferrario Ravasio (University of Oxford)
      • 14:55
        Parton-Shower Effects in Higgs Production via Vector-Boson Fusion 15m
        Speaker: Johannes Scheller (Eberhard Karls Universität Tübingen)
      • 15:10
        Spin correlations in the PanScales parton showers and jet observables 15m
        Speaker: Rob Verheyen
    • 15:25 15:40
      Break 15m
    • 15:40 16:55
      Talks: Parton shower accuracy
      • 15:40
        Sector showers with fixed-order corrections 20m
        Speaker: Christian Preuss (Monash University)
      • 16:00
        Subleading colour effects in the PanScales parton showers and beyond 15m

        It is known that standard dipole showers yield incorrect subleading-colour contributions already at leading-logarithmic level for certain observables. In this talk, I will present two new, simple prescriptions to palliate this issue. I will show how the resulting colour-corrected matrix elements are cured at fixed order in the appropriate limits. I will then demonstrate how the two algorithms allow us to achieve full-colour next-to-leading logarithmic accuracy for various observables (global observables and multiplicities). I will conclude by commenting on the comparison to full-colour NLL-resummed results for non-global observables.

        Speaker: Ludovic Scyboz (University of Oxford)
      • 16:15
        Improved dipole showers 20m
        Speaker: Simon Platzer (University of Vienna (AT))
      • 16:35
        Subleading effect in parton showers 20m
        Speaker: Davison Soper (University of Oregon)
    • 16:55 17:10
      Break 15m
    • 17:10 18:30
      Discussion PS accuracy 1h 20m
    • 14:00 15:25
      Talks: Higher orders and resummation
      • 14:00
        The Geneva framework 20m
        Speaker: Matthew Lim (Universita' di Milano-Bicocca)
      • 14:20
        qT subtraction/resummation at N3LO/N3LL 20m
        Speaker: Leandro Cieri (INFN)
      • 14:40
        Transverse momentum resummation on the azimuthal spectra of the final leptons in the Drell-Yan processes 15m
        Speaker: Wanli Ju (Durham University)
      • 14:55
        Fiducial Higgs and Drell-Yan distributions at N3LL'+NNLO with RadISH 15m
        Speaker: Dr Luca Rottoli (Universitaet Zuerich (CH))
      • 15:10
        Azimuthal decorrelation in V+jet production with the WTA axis 15m
        Speaker: Rudi Rahn (Universiteit van Amsterdam)
    • 15:25 15:40
      Break 15m
    • 15:40 16:45
      Talks: TMDs and resummation
      • 15:40
        kT factorisation and TMDs 20m
        Speaker: Andreas van Hameren (IFJ PAN)
      • 16:00
        The parton branching method for TMDs in Monte Carlo calculations 15m
        Speaker: Mees van Kampen (University of Antwerp)
      • 16:15
        Quenching effects in the jet spectrum at various cone sizes 15m
        Speaker: Adam Takacs (University of Bergen)
      • 16:30
        Automating the calculation of jet and beam functions 15m
        Speaker: Goutam Das (University of Siegen)
    • 16:45 16:55
      Break 10m
    • 16:55 17:55
      Talks: Resummation
      • 16:55
        Evolution of Track functions at order alpha_s^2 15m
        Speaker: Solange Schrijnder van Velzen
      • 17:10
        Next-to-leading power two-loop soft functions for the Drell-Yan process at threshold 15m
        Speaker: Mr Sebastian Jaskiewicz (Technical University of Munich)
      • 17:25
        NLP resummation and the endpoint divergent contribution in DIS 15m
        Speaker: Leonardo Vernazza (INFN, Torino)
      • 17:40
        The role of NLP threshold corrections in dQCD and SCET 15m
        Speaker: Melissa van Beekveld