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Logarithmic accuracy of parton showers: a fixed-order study
/ Dasgupta, Mrinal (Manchester U.) ; Dreyer, Frédéric A. (MIT, Cambridge, CTP) ; Hamilton, Keith (University Coll. London ; CERN) ; Monni, Pier Francesco (CERN) ; Salam, Gavin P. (CERN ; MIT)
We formulate some first fundamental elements of an approach for assessing the logarithmic accuracy of parton-shower algorithms based on two broad criteria: their ability to reproduce the singularity structure of multi-parton matrix elements, and their ability to reproduce logarithmic resummation results. We illustrate our approach by considering properties of two transverse momentum ordered final-state showers, examining features up to second order in the strong coupling. [...]
arXiv:1805.09327; CERN-TH-2018-113.-
2018-09-07 - 33 p.
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: arXiv:1805.09327 - PDF; 1805.09327 - PDF;
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2.
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MiNNLO$_{\text{PS}}$: A new method to match NNLO QCD to parton showers
/ Monni, Pier Francesco (CERN) ; Nason, Paolo (INFN, Milan Bicocca ; Milan Bicocca U.) ; Re, Emanuele (CERN ; Annecy, LAPTH) ; Wiesemann, Marius (CERN ; Munich, Max Planck Inst.) ; Zanderighi, Giulia (Munich, Max Planck Inst.)
We present a novel method to combine QCD calculations at next-to-next-to-leading order (NNLO) with parton shower (PS) simulations, that can be applied to the production of heavy systems in hadronic collisions, such as colour singlets or a $t\bar{t}$ pair. The NNLO corrections are included by connecting the MiNLO$^\prime$ method with transverse-momentum resummation, and they are calculated at generation time without any additional reweighting, making the algorithm considerably efficient. [...]
arXiv:1908.06987; CERN-TH-2019-117; LAPTH-042/19; MPP-2019-177.-
2020-05-27 - 45 p.
- Published in : JHEP 2005 (2020) 143
Article from SCOAP3: PDF; Fulltext: PDF;
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Momentum-space resummation for transverse observables and the Higgs $p_\perp$ at N$^3$LL+NNLO
/ Bizon, Wojciech (Oxford U., Theor. Phys.) ; Monni, Pier Francesco (CERN) ; Re, Emanuele (CERN ; Annecy, LAPTH) ; Rottoli, Luca (Oxford U., Theor. Phys.) ; Torrielli, Paolo (Turin U. ; INFN, Turin)
We present an approach to the momentum-space resummation of global, recursive infrared and collinear safe observables featuring kinematic zeros away from the Sudakov limit. In the hadro-production of a generic colour singlet, we consider the family of inclusive observables which do not depend on the rapidity of the radiation, prime examples being the transverse momentum of the singlet, and $\phi^*$ in Drell-Yan pair production. [...]
arXiv:1705.09127; OUTP-17-05P; CERN-TH-2017-111; LAPTH-018-17.-
2018-02-19 - 50 p.
- Published in : JHEP 02 (2018) 108
Article from SCOAP3: PDF; Fulltext: arXiv:1705.09127 - PDF; 1705.09127 - PDF;
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A numerical formulation of resummation in effective field theory
/ Bauer, Christian W. (LBL, Berkeley) ; Monni, Pier Francesco (CERN)
In this article we show how the resummation of infrared and collinear logarithms within Soft-Collinear Effective Theory (SCET) can be formulated in a way that makes it suitable for a Monte-Carlo implementation. This is done by applying the techniques developed for automated resummation using the branching formalism, which have resulted in the general resummation approach CAESAR/ARES. [...]
arXiv:1803.07079; CERN-TH-2018-055.-
2019-02-27 - 47 p.
- Published in : JHEP 02 (2019) 185
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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5.
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Parton distributions with threshold resummation
/ Bonvini, Marco (Oxford U., Theor. Phys.) ; Marzani, Simone (MIT, Cambridge, CTP) ; Rojo, Juan (Oxford U., Theor. Phys.) ; Rottoli, Luca (Oxford U., Theor. Phys.) ; Ubiali, Maria (Cambridge U.) ; Ball, Richard D. (U. Edinburgh, Higgs Ctr. Theor. Phys. ; CERN) ; Bertone, Valerio (CERN) ; Carrazza, Stefano (Milan U. ; INFN, Milan) ; Hartland, Nathan P. (Oxford U., Theor. Phys.)
We construct a set of parton distribution functions (PDFs) in which fixed-order NLO and NNLO calculations are supplemented with soft-gluon (threshold) resummation up to NLL and NNLL accuracy respectively, suitable for use in conjunction with any QCD calculation in which threshold resummation is included at the level of partonic cross sections. These resummed PDF sets, based on the NNPDF3.0 analysis, are extracted from deep-inelastic scattering, Drell-Yan, and top quark pair production data, for which resummed calculations can be consistently used. [...]
arXiv:1507.01006; OUTP-15-03P; MIT-CTP-4657; CAVENDISH-HEP-15-02; CERN-PH-TH-2015-060; EDINBURGH-2015-04; TIF-UNIMI-2015-6; OUTP-15-03P; MIT-CTP 4657; CAVENDISH-HEP-15-02; CERN-PH-TH-2015-060; EDINBURGH 2015-04; TIF-UNIMI-2015-6.-
Geneva : CERN, 2015-09-28 - 44 p.
- Published in : JHEP 09 (2015) 191
Article from SCOAP3: PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint
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6.
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Parton Showers beyond Leading Logarithmic Accuracy
/ Dasgupta, Mrinal (U. Manchester (main)) ; Dreyer, Frédéric A. (Oxford U., Theor. Phys.) ; Hamilton, Keith (U. Coll. London) ; Monni, Pier Francesco (CERN) ; Salam, Gavin P. (Oxford U., Theor. Phys.) ; Soyez, Gregory (IPhT, Saclay)
Parton showers are among the most widely used tools in collider physics. Despite their key importance, none so far has been able to demonstrate accuracy beyond a basic level known as leading logarithmic (LL) order, with ensuing limitations across a broad spectrum of physics applications. [...]
arXiv:2002.11114; CERN-TH-2020-026.-
2020-07-29 - 6 p.
- Published in : Phys. Rev. Lett. 125 (2020) 052002
Article from SCOAP3: PDF; Fulltext: PDF;
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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.-
2023-03-28 - 42 p.
Fulltext: 2301.09645 - PDF; Publication - PDF; Erratum - PDF;
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