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Theoretical physicists working at a blackboard collaboration pod in the Beecroft building.
Credit: Jack Hobhouse

Dr Alexander Karlberg

Postdoctoral Research Assistant

Research theme

  • Fundamental particles and interactions

Sub department

  • Rudolf Peierls Centre for Theoretical Physics

Research groups

  • Particle theory
alexander.karlberg@physics.ox.ac.uk
Telephone: +41764304276
Rudolf Peierls Centre for Theoretical Physics
  • About
  • Research
  • Teaching
  • Prizes, awards and recognition
  • Publications

Two-loop anomalous dimensions for small- R jet versus hadronic fragmentation functions

Journal of High Energy Physics Springer 2024:7 (2024) 239

Authors:

Melissa van Beekveld, Mrinal Dasgupta, Basem Kamal El-Menoufi, Jack Helliwell, Alexander Karlberg, Pier Francesco Monni

Abstract:

We study the collinear fragmentation of highly energetic jets defined with a small jet radius. In particular, we investigate how the corresponding fragmentation functions differ from their hadronic counterpart defined in the common MS¯ scheme. We find that the anomalous dimensions governing the perturbative evolution of the two fragmentation functions differ starting at the two loop order. We compute for the first time the new anomalous dimensions at two loops and confirm our predictions by comparing the inclusive small-R jet spectrum against a fixed order perturbative calculation at O(αs2). To investigate the dependence of the anomalous dimension on the kinematic cutoff variable, we study the fragmentation functions of Cambridge jets defined with a transverse momentum cutoff as opposed to an angular cutoff R. We further study the evolution of the small-R fragmentation function with an alternative cutoff scale, proportional to zR, representing the maximum possible transverse momentum of emissions within a jet. In these cases we find that the two-loop anomalous dimensions coincide with the MS¯ DGLAP ones, highlighting a correspondence between the MS¯ scheme and a transverse-momentum cutoff.
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An event generator for neutrino-induced Deep Inelastic Scattering and applications to neutrino astronomy

(2024)

Authors:

Silvia Ferrario Ravasio, Rhorry Gauld, Barbara Jäger, Alexander Karlberg, Giulia Zanderighi
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QCD effects in electroweak WZjj production at current and future hadron colliders

European Physical Journal C Springer Nature 84:6 (2024) 587

Authors:

B Jäger, A Karlberg, S Reinhardt
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A new standard for the logarithmic accuracy of parton showers

(2024)

Authors:

Melissa van Beekveld, Mrinal Dasgupta, Basem Kamal El-Menoufi, Silvia Ferrario Ravasio, Keith Hamilton, Jack Helliwell, Alexander Karlberg, Pier Francesco Monni, Gavin P Salam, Ludovic Scyboz, Alba Soto-Ontoso, Gregory Soyez
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Event generators for high-energy physics experiments

SciPost Physics Stichting SciPost 16:5 (2024) 130

Authors:

JM Campbell, M Diefenthaler, TJ Hobbs, Stefan Höche, Joshua Isaacson, Felix Kling, Stephen Mrenna, J Reuter, S Alioli, JR Andersen, C Andreopoulos, AM Ankowski, Elke Caroline Aschenauer, A Ashkenazi, MD Baker, Joshua L Barrow, Melissa van Beekveld, Gavin Bewick, S Bhattacharya, Christian Bierlich, Enrico Bothmann, P Bredt, A Broggio, Andy Buckley, A Butter, Jonathan Mark Butterworth, EP Byrne, Carlo Carloni-Calame, Smita Chakraborty, X Chen, M Chiesa, JT Childers, J Cruz-Martinez, J Currie, N Darvishi, M Dasgupta, A Denner, FA Dreyer, S Dytman, Basem Kamal El-Menoufi, Tim Engel, Silvia Ferrario Ravasio, Daniel Figueroa, L Flower, JR Forshaw, Rikkert Frederix, Alex Friedland, Stefano Frixione, H Gallagher, K Gallmeister, Simon Gardiner, Rhorry Gauld, Jonathan Gaunt, A Gavardi, T Gehrmann, Aude Gehrmann-De Ridder, Leif Gellersen, Walter Giele, Stefan Gieseke, Francesco Giuli, EWN Glover, Massimiliano Grazzini, A Grohsjean, Christian Gütschow, Keith Hamilton, T Han, R Hatcher, G Heinrich, Ilkka Helenius, O Hen, Valentin Hirschi, M Höfer, J Holguin, Alexander Huss, Philip Ilten, Stanislaw Jadach, A Jentsch, SP Jones, W Ju, Stefan Kallweit, Alexander Karlberg, T Katori, Matthias Kerner, C Kilian, MM Kirchgaeßer, S Klein, Max Knobbe, Claudius Krause, Frank Krauss, J Lang, J-N Lang, G Lee, SW Li, MA Lim, JM Lindert, D Lombardi, Leif Lönnblad, M Löschner, N Lurkin, Y Ma, P Machado, Vitaly Magerya, A Maier, I Majer, Fabio Maltoni, M Marcoli, G Marinelli, MR Masouminia, Pierpaolo Mastrolia, Olivier Mattelaer, J Mazzitelli, Josh McFayden, Rok Medves, P Meinzinger, J Mo, Pier Francesco Monni, Guido Montagna, T Morgan, U Mosel, Benjamin Nachman, Pavel Nadolsky, R Nagar, Zoltan Nagy, Davide Napoletano, Paolo Nason, Tobias Neumann, LJ Nevay, Oreste Nicrosini, J Niehues, K Niewczas, Thorsten Ohl, Giovanni Ossola, V Pandey, A Papadopoulou, Andreas Papaefstathiou, Gil Paz, Mathieu Pellen, Giovanni Pelliccioli, T Peraro, Fluvio Piccinini, L Pickering, J Pires, Wieslaw Placzek, Simon Plätzer, Tilman Plehn, Stefano Pozzorini, Stefan Prestel, Christian Tobias Preuss, AC Price, Seth Quackenbush, Emanuele Re, Daniel Reichelt, Laura Reina, Christian Reuschle, Peter Richardson, M Rocco, N Rocco, M Roda, A Rodriguez Garcia, Stefan Roiser, Juan Rojo, Luca Rottoli, Gavin P Salam, Marek Schönherr, S Schuchmann, Steffen Schumann, Robin Schürmann, Ludovic Scyboz, Michael H Seymour, Frank Siegert, Adrian Signer, Gurpreet Singh Chahal, Andrzej Siódmok, Torbjörn Sjöstrand, Peter Skands, Jennifer M Smillie, JT Sobczyk, Dennis Soldin, DE Soper, Alba Soto-Ontoso, Gregory Soyez, Giovanni Stagnitto, J Tena-Vidal, O Tomalak, Francesco Tramontano, Sebastian Trojanowski, Z Tu, Sandro Uccirati, T Ullrich, Yannick Ulrich, Marius Utheim, A Valassi, Andrii Verbytskyi, Rob Verheyen, M Wagman, D Walker, BR Webber, L Weinstein, O White, James Whitehead, Marius Wiesemann, C Wilkinson, C Williams, Ramon Winterhalder, C Wret, K Xie, T-Z Yang, E Yazgan, Giulia Zanderighi, S Zanoli, Korinna Zapp
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