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CERN Document Server 23 notices trouvées  1 - 10suivantfin  aller vers la notice: La recherche a duré 1.11 secondes. 
1.
An event generator for neutrino-induced Deep Inelastic Scattering and applications to neutrino astronomy / Ferrario Ravasio, Silvia (CERN) ; Gauld, Rhorry (Garching, Max Planck Inst.) ; Jäger, Barbara (Tubingen U.) ; Karlberg, Alexander (CERN) ; Zanderighi, Giulia (Garching, Max Planck Inst. ; Munich, Tech. U.)
We extend the recently presented, fully exclusive, next-to-leading-order accurate event generator for the simulation of massless neutral- and charged-current deep inelastic scattering (DIS) to the case of incoming neutrinos. [...]
CERN-TH-2024-091 ; MPP-2024-121 ; arXiv:2407.03894. - 16 p.
Fulltext
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2.
A 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 - 19 p. - Published in : Phys. Rev. Lett.
- Published in : Phys. Rev. Lett. Fulltext: PDF;
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3.
Benchmark of deep-inelastic-scattering structure functions at $\mathcal {O}\left( \alpha _s ^3\right) $ / Bertone, Valerio (IRFU, Saclay) ; Karlberg, Alexander (CERN)
We present a benchmark comparison of the massless inclusive deep-inelastic-scattering (DIS) structure functions up to $\mathcal{O}(\alpha_s^3)$ in perturbative QCD. The comparison is performed using the codes APFEL++ and HOPPET within the framework of the variable-flavour-number scheme and over a broad kinematic range relevant to the extraction of parton distribution functions. [...]
arXiv:2404.15711; CERN-TH-2024-018.- 2024-08-04 - 18 p. - Published in : Eur. Phys. J. C 84 (2024) 774 Fulltext: document - PDF; 2404.15711 - PDF;
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4.
QCD effects in electroweak $WZjj$ production at current and future hadron colliders / Jäger, Barbara (Tubingen U.) ; Karlberg, Alexander (CERN) ; Reinhardt, Simon (Tubingen U.)
We present an update of an existing implementation of $WZjj$ production via vector-boson scattering in the framework of the POWHEG BOX program. In particular, previously unavailable semi-leptonic and fully hadronic decay modes of the intermediate vector bosons are provided, and operators of dimension six in an effective-field theory approach to account for physics beyond the Standard Model in the electroweak sector are included. [...]
arXiv:2403.12192; CERN-TH-2024-036.- 2024-06-08 - 22 p. - Published in : Eur. Phys. J. C 84 (2024) 587 Fulltext: document - PDF; 2403.12192 - PDF;
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5.
Two-loop anomalous dimensions for small-$R$ jet versus hadronic fragmentation functions / van Beekveld, Melissa (Nikhef, Amsterdam) ; Dasgupta, Mrinal (Manchester U.) ; El-Menoufi, Basem Kamal (Manchester U. ; Monash U.) ; Helliwell, Jack (Oxford U., Theor. Phys.) ; Karlberg, Alexander (CERN) ; Monni, Pier Francesco (CERN)
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 $\overline{\rm MS}$ scheme. [...]
arXiv:2402.05170; CERN-TH-2023-224; OUTP-24-02P; Nikhef 2024-001.- 2024-07-25 - 28 p. - Published in : JHEP 2407 (2024) 239 Fulltext: document - PDF; 2402.05170 - PDF;
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6.
disorder: Deep inelastic scattering at high orders / Karlberg, Alexander (CERN)
We present a Fortran 77/95 code capable of computing QCD corrections in deep inelastic scattering (DIS). The code uses the Projection-to-Born method to augment an existing $\mathcal{O}(\alpha_s^2)$ dijet DIS code, thereby obtaining predictions for photon-mediated neutral-current single-jet DIS production in the laboratory frame. [...]
arXiv:2401.16964; CERN-TH-2023-229.- 2024-01-30 - 17 p. - Published in : 10.21468/SciPostPhysCodeb.32 Fulltext: PDF;
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7.
Ad interim recommendations for the Higgs boson production cross sections at $\sqrt{s} = 13.6$ TeV / Karlberg, Alexander (CERN) ; Malcles, Julie (Université Paris-Saclay (FR)) ; Mistlberger, Bernhard (SLAC National Accelerator Laboratory (US)) ; Di Nardo, Roberto (Universita e INFN Roma Tre (IT)) ; Jones, Stephen Philip (University of Durham (GB)) ; Abidi, Haider (Brookhaven National Laboratory (US)) ; Ferrario Ravasio, Silvia (CERN) ; Pellen, Mathieu (Albert Ludwigs Universitaet Freiburg (DE)) ; Barone, Gaetano (Brown University (US)) ; Cooperstein, Stephane Brunet (Univ. of California San Diego (US)) et al.
This note documents predictions for the production cross sections of the Standard Model Higgs boson at the Large Hadron Collider at a centre of mass energy of 13.6 TeV. The predictions here are based on simple extrapolations of previously documented predictions published in the CERN Yellow Report ”Deciphering the Nature of the Higgs Sector”. [...]
arXiv:2402.09955; LHCHWG-2024-001.- Geneva : CERN, 2024 - 13 p. Fulltext: PDF; Updated PDF following discussions before final approval: PDF;
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8.
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: Publication - PDF; 2312.13275 - PDF;
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9.
A POWHEG generator for deep inelastic scattering / Banfi, Andrea (Sussex U.) ; Ferrario Ravasio, Silvia (CERN) ; Jäger, Barbara (Tubingen U.) ; Karlberg, Alexander (CERN) ; Reichenbach, Felix (Tubingen U.) ; Zanderighi, Giulia (Munich, Max Planck Inst. ; Munich, Tech. U.)
We present a new event generator for the simulation of both neutral- and charged-current deep inelastic scattering (DIS) at next-to-leading order in QCD matched to parton showers using the POWHEG method. Our implementation builds on the existing POWHEG BOX framework originally designed for hadron-hadron collisions, supplemented by considerable extensions to account for the genuinely different kinematics inherent to lepton-hadron collisions. [...]
arXiv:2309.02127.- 2024-02-02 - 54 p.
Fulltext: document - PDF; 2309.02127 - PDF;
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10.
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 Fulltext: PDF;
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11 Karlberg, A.
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