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Flavoured jet algorithms: a comparative study
/ Behring, Arnd (Garching, Max Planck Inst.) ; Caletti, Simone (Zurich, ETH) ; Giuli, Francesco (Rome U., Tor Vergata ; INFN, Rome) ; Grabarczyk, Radoslaw (Oxford U. ; Oxford U., Theor. Phys.) ; Hinzmann, Andreas (DESY) ; Huss, Alexander (CERN) ; Huston, Joey (Michigan State U.) ; Lesser, Ezra D. (CERN) ; Marzani, Simone (Genoa U. ; INFN, Genoa) ; Napoletano, Davide (Milan Bicocca U. ; INFN, Milan Bicocca) et al.
The accurate identification of heavy-flavour jets, those which originate from bottom or charm quarks, is crucial for precision studies of the Standard Model and searches for new physics. [...]
arXiv:2506.13449 ; CERN-TH-2025-113 ; IFJPAN-IV-2025-13 ; MCNET-25-14 ; MPP-2025-118 ; PUBDB-2025-01862.
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2025-06-16 - 81.
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Logarithmically-accurate and positive-definite NLO shower matching
/ van Beekveld, Melissa (NIKHEF, Amsterdam) ; Ferrario Ravasio, Silvia (CERN) ; Helliwell, Jack (Monash U.) ; Karlberg, Alexander (CERN) ; Salam, Gavin P. (Oxford U., Theor. Phys. ; U. Oxford (main)) ; Scyboz, Ludovic (Monash U.) ; Soto-Ontoso, Alba (Granada U.) ; Soyez, Gregory (IPhT, Saclay) ; Zanoli, Silvia (Oxford U., Theor. Phys.)
We present methods to achieve NLL+NLO accurate parton showering for processes with two coloured legs: neutral- and charged-current Drell-Yan, and Higgs production in $pp$ collisions, as well as DIS and $e^+e^-$ to jets. [...]
CERN-TH-2025-004 ; OUTP-25-01P ; Nikhef 2025-003 ; arXiv:2504.05377.
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50.
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New Standard for the Logarithmic Accuracy of Parton Showers
/ van Beekveld, Melissa (Nikhef, Amsterdam) ; Dasgupta, Mrinal (Manchester U.) ; El-Menoufi, Basem Kamal (Monash U.) ; Ferrario Ravasio, Silvia (CERN) ; Hamilton, Keith (University Coll. London) ; Helliwell, Jack (Oxford U., Theor. Phys.) ; Karlberg, Alexander (CERN) ; Monni, Pier Francesco (CERN) ; Salam, Gavin P. (Oxford U., Theor. Phys. ; U. Oxford (main)) ; Scyboz, Ludovic (Monash U.) et al.
We report on a major milestone in the construction of logarithmically accurate final-state parton showers, achieving next-to-next-to-leading-logarithmic (NNLL) accuracy for the wide class of observables known as event shapes. The key to this advance lies in the identification of the relation between critical NNLL analytic resummation ingredients and their parton-shower counterparts. [...]
arXiv:2406.02661; CERN-TH-2024-057; OUTP-24-03P.-
2025-01-03 - 7 p.
- Published in : Phys. Rev. Lett. 134 (2025) 011901
Fulltext: 2406.02661 - PDF; Publication - PDF;
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Introduction to the PanScales framework, version 0.1
/ van Beekveld, Melissa (Nikhef, Amsterdam) ; Dasgupta, Mrinal (Manchester U.) ; El-Menoufi, Basem Kamal (Manchester U. ; Monash U.) ; Ravasio, Silvia Ferrario (CERN) ; Hamilton, Keith (U. Coll. London) ; Helliwell, Jack (Oxford U.) ; Karlberg, Alexander (CERN) ; Medves, Rok (Oxford U.) ; Monni, Pier Francesco (CERN) ; Salam, Gavin P. (Oxford U.) et al.
In this article, we document version 0.1 of the PanScales code for parton shower simulations. With the help of a few examples, we discuss basic usage of the code, including tests of logarithmic accuracy of parton showers. [...]
arXiv:2312.13275; CERN-TH-2023-238; Nikhef 2023-026; OUTP-23-16P.-
2024-06 - 25 p.
- Published in : 10.21468/SciPostPhysCodeb.31
Fulltext: 2312.13275 - PDF; Publication - PDF;
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Parton Showering with Higher Logarithmic Accuracy for Soft Emissions
/ Ferrario Ravasio, Silvia (CERN) ; Hamilton, Keith (University Coll. London) ; Karlberg, Alexander (CERN) ; Salam, Gavin P. (Oxford U., Theor. Phys. ; Oxford U.) ; Scyboz, Ludovic (Oxford U., Theor. Phys.) ; Soyez, Gregory (CERN ; IPhT, Saclay)
The accuracy of parton-shower simulations is often a limiting factor in the interpretation of data from high-energy colliders. We present the first formulation of parton showers with accuracy one order beyond state-of-the-art next-to-leading logarithms, for classes of observable that are dominantly sensitive to low-energy (soft) emissions, specifically non-global observables and subjet multiplicities. [...]
arXiv:2307.11142; CERN-TH-2023-127; OUTP-23-07P.-
2023-10-18 - 11 p.
- Published in : Phys. Rev. Lett. 131 (2023) 161906
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Matching and event-shape NNDL accuracy in parton showers
/ Hamilton, Keith (University Coll. London) ; Karlberg, Alexander (Oxford U., Theor. Phys. ; CERN) ; Salam, Gavin P. (Oxford U., Theor. Phys. ; Oxford U.) ; Scyboz, Ludovic (Oxford U., Theor. Phys.) ; Verheyen, Rob (University Coll. London)
To explore the interplay of NLO matching and next-to-leading logarithmic (NLL) parton showers, we consider the simplest case of $\gamma^*$ and Higgs-boson decays to $q\bar q$ and $gg$ respectively. Not only should shower NLL accuracy be retained across observables after matching, but for global event-shape observables and the two-jet rate, matching can augment the shower in such a way that it additionally achieves next-to-next-to-double-logarithmic (NNDL) accuracy, a first step on the route towards general NNLL. [...]
arXiv:2301.09645; CERN-TH-2023-004.-
2023-03-28 - 42 p.
Fulltext: 2301.09645 - PDF; Publication - PDF; Erratum - PDF;
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Effective Field Theory descriptions of Higgs boson pair production
/ Gröber, Ramona (Dipartimento di Fisica e Astronomia "G.Galilei", Università di Padova and INFN, Sezione di Padova, 35131 Padova, Italy) ; Alasfar, Lina (Institut für Physik, Humboldt-Universität zu Berlin, D-12489 Berlin, Germany) ; Cadamuro, Luca (Université Paris-Saclay (FR)) ; Dimitriadi, Christina (University of Bonn (DE)) ; Ferrari, Arnaud (Uppsala University (SE)) ; Heinrich, Gudrun Marlen (KIT - Karlsruhe Institute of Technology (DE)) ; Ingebretsen Carlson, Tom (Stockholm University (SE)) ; Lang, Jannis (Institute for Theoretical Physics, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany) ; Ordek, Serhat (Uppsala University (SE)) ; Pereira Sanchez, Laura (Stockholm University (SE)) et al.
Higgs boson pair production is traditionally considered to be of particular interest for a measurement of the trilinear Higgs self-coupling. Yet it can offer insights into other couplings as well, since - in an effective field theory (EFT) parameterisation of potential new physics - both the production cross section and kinematical properties of the Higgs boson pair depend on various other Wilson coefficients of EFT operators. [...]
LHCHWG-2022-004.-
Geneva : CERN, 2022 - 38.
LHC Higgs WG note: PDF;
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