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Sökning: WFRF:(Frederix Rikkert)

  • Resultat 11-13 av 13
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11.
  • Frederix, Rikkert, et al. (författare)
  • Subleading EW corrections and spin-correlation effects in tt¯ W multi-lepton signatures
  • 2020
  • Ingår i: European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; 80:9
  • Tidskriftsartikel (refereegranskat)abstract
    • Recently a slight tension between data and predictions has been reported in tt¯ W production by both the CMS and ATLAS collaborations. We revisit the theoretical predictions for this process, focussing on the following two effects. We disentangle various effects that lead to asymmetries among the leptonic decay products of the (anti-)top quarks and W bosons, for which we find that the spin correlations in the top-quark pair are the dominant source. We also discuss the impact of the large, formally subleading, electroweak corrections to tt¯ W production at the LHC. We find that this effect changes the tt¯ W cross section significantly in the signature phase-space regions, and should therefore be included differentially in the theory to data comparisons.
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12.
  • Frederix, Rikkert, et al. (författare)
  • The colour matrix at next-to-leading-colour accuracy for tree-level multi-parton processes
  • 2021
  • Ingår i: Journal of High Energy Physics. - 1029-8479. ; 2021:12
  • Tidskriftsartikel (refereegranskat)abstract
    • We investigate the next-to-leading-colour (NLC) contributions to the colour matrix in the fundamental and the colour-flow decompositions for tree-level processes with all gluons, one quark pair and two quark pairs. By analytical examination of the colour factors, we find the non-zero elements in the colour matrix at NLC. At this colour order, together with the symmetry of the phase-space, it is reduced from factorial to polynomial the scaling of the contributing dual amplitudes as the number of partons participating in the scattering process is increased. This opens a path to an accurate tree-level matrix element generator of which all factorial complexity is removed, without resulting to Monte Carlo sampling over colour.
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13.
  • Valassi, Andrea, et al. (författare)
  • Challenges in Monte Carlo Event Generator Software for High-Luminosity LHC
  • 2021
  • Ingår i: Computing and Software for Big Science. - : Springer Science and Business Media LLC. - 2510-2044 .- 2510-2036. ; 5:1
  • Tidskriftsartikel (refereegranskat)abstract
    • We review the main software and computing challenges for the Monte Carlo physics event generators used by the LHC experiments, in view of the High-Luminosity LHC (HL-LHC) physics programme. This paper has been prepared by the HEP Software Foundation (HSF) Physics Event Generator Working Group as an input to the LHCC review of HL-LHC computing, which has started in May 2020.
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  • Resultat 11-13 av 13

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