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CERN Document Server 2,029 records found  1 - 10nextend  jump to record: Search took 0.50 seconds. 
1.
(100)
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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2.
(91)
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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3.
(61)
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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4.
(56)
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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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. [...]
arXiv:2406.02661 ; CERN-TH-2024-057 ; OUTP-24-03P. - 19 p.
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6.
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Threshold resummation for the production of four top quarks at the LHC / van Beekveld, Melissa (Oxford U., Theor. Phys.) ; Kulesza, Anna (Munster U., ITP ; CERN) ; Valero, Laura Moreno (Munster U., ITP)
We compute the total cross section for $t\bar{t}t\bar{t}$ production at next-to-leading logarithmic (NLL$^{\prime}$) accuracy. This is the first time resummation is performed for a hadron-collider process with four colored particles in the final state. [...]
arXiv:2212.03259; OUTP-22-11P; MS-TP-22-51; CERN-TH-2022-142.- 2023-11-20 - 8 p. - Published in : Phys. Rev. Lett. 131 (2023) 211901 Fulltext: 2212.03259 - PDF; Publication - PDF;
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7.
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Higher-order non-global logarithms from jet calculus / Banfi, Andrea (Sussex U.) ; Dreyer, Frédéric A. (Oxford U., Theor. Phys.) ; Monni, Pier Francesco (CERN)
Non-global QCD observables are characterised by a sensitivity to the full angular distribution of soft radiation emitted coherently in hard scattering processes. This complexity poses a challenge to their all-order resummation, that was formulated at the leading-logarithmic order about two decades ago. [...]
arXiv:2111.02413; CERN-TH-2021-157; OUTP-21-24P CERN-TH-2021-157; OUTP-21-24P.- 2022-03-21 - 33 p. - Published in : JHEP 2203 (2022) 135 Fulltext: 2111.02413 - PDF; document - PDF;
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8.
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Next-to-leading non-global logarithms in QCD / Banfi, Andrea (Sussex U.) ; Dreyer, Frédéric A. (Oxford U., Ctr. Quantum Comp.) ; Monni, Pier Francesco (CERN)
Non-global logarithms arise from the sensitivity of collider observables to soft radiation in limited angular regions of phase space. Their resummation to next-to-leading logarithmic (NLL) order has been a long standing problem and its solution is relevant in the context of precision all-order calculations in a wide variety of collider processes and observables. [...]
arXiv:2104.06416.- 2021-10-01 - 35 p. - Published in : JHEP 2110 (2021) 006 Fulltext: 2104.06416 - PDF; document - PDF;
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9.
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A collinear shower algorithm for NSL non-singlet fragmentation / van Beekveld, Melissa (NIKHEF, Amsterdam) ; Dasgupta, Mrinal (Manchester U.) ; El-Menoufi, Basem Kamal (Monash U.) ; Helliwell, Jack (Oxford U., Theor. Phys.) ; Monni, Pier Francesco (CERN) ; Salam, Gavin P. (Oxford U., Theor. Phys. ; U. Oxford (main))
We formulate a collinear partonic shower algorithm that achieves next-to-single-logarithmic (NSL, $\alpha_s^n L^{n-1}$) accuracy for collinear-sensitive non-singlet fragmentation observables. [...]
CERN-TH-2024-125 ; Nikhef 2024-013 ; OUTP-24-05P ; arXiv:2409.08316. - 36.
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10.
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Next-to-leading-logarithmic PanScales showers for Deep Inelastic Scattering and Vector Boson Fusion / van Beekveld, Melissa (Oxford U., Theor. Phys.) ; Ferrario Ravasio, Silvia (CERN)
We introduce the first family of parton showers that achieve next-to-leading logarithmic (NLL) accuracy for processes involving a $t$-channel exchange of a colour-singlet, and embed them in the PanScales framework. These showers are applicable to processes such as deep inelastic scattering (DIS), vector boson fusion (VBF), and vector boson scattering (VBS). [...]
arXiv:2305.08645; CERN-TH-2023-079; OUTP-23-05P.- 2024-02-01 - 50 p. - Published in : JHEP 2402 (2024) 001 Fulltext: Publication - PDF; 2305.08645 - PDF;
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