Journal: PoS: Proceedings of Science

Abbreviation

Pos proc. sci.

Publisher

SISSA

Journal Volumes

ISSN

1824-8039

Description

Filters

2024 - 20254
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Publications 1 - 4 of 4
  • Four-loop large-n$_f$ contributions to the non-singlet structure functions
    Item type: Conference Paper
    Pelloni, Andrea (2024)
    PoS: Proceedings of Science
    We present the progress in the computation of the unpolarized coefficient functions for Deep inelastic scattering. This computation completes the previous results for F$_{2,L}$ for large-n$_f$ with the computation of the contributions to the charged current F$_3$. This additional structure function has contributions with color factor d$^{abc}$d$_{abc}$, and represents an increase in complexity for the construction of the differential equations used for the generation of the Mellin moments.
  • Flow Oriented Perturbation Theory
    Item type: Conference Paper
    Salas-Bernárdez, Alexandre; Borinsky, Michael; Capatti, Zeno; et al. (2024)
    PoS: Proceedings of Science
    Flow Oriented Perturbation Theory (FOPT) is a novel approach to Feynman diagrams based on the coordinate (position) space description of Quantum Field Theories (QFT). FOPT offers interesting features regarding the computation of higher-loop Feynman amplitudes such as combinatorial and canonical Feynman rules, explicit infrared singularity factorization on a per-diagram level and the potential to have manifest cancellation of real and virtual singularities. In these proceedings we briefly summarize the derivation of FOPT and present its Feynman rules for covariant diagrams, S-matrix elements and cut diagrams in massless scalar QFT, supported by examples. We then discuss the extension of FOPT to massless fermion fields and indicate steps towards the treatment of massive lines in arbitrary dimensions.
  • Towards Lamb shift spectroscopy of antihydrogen atoms at the GBAR (Equation presented) beam line
    Item type: Conference Paper
    Tanaka, T.A.; Blumer, P.; Janka, G.; et al. (2025)
    PoS: Proceedings of Science ~ International Conference on Exotic Atoms and Related Topics and Conference on Low Energy Antiprotons (EXA-LEAP2024)
  • NNLO Matrix-Element Corrections in VINCIA
    Item type: Conference Paper
    Skands, Peter; Preuss, Christian (2024)
    PoS: Proceedings of Science
    We report on a new formalism for parton showers whose fixed-order expansion can be corrected through next-to-next-to-leading order (NNLO) in QCD. It is the first such formalism we are aware of that has no dependence on any auxiliary scales or external resummations and which is fully differential in all of the relevant phase spaces. Since the shower acts as the phase-space generator, the dominant singularity structures are encoded by construction and the method can generate unweighted events with very high efficiency without any significant initialisation time. We argue that the the method should be capable of achieving (at least) NNLO+NNDL accuracy for the shower evolution variable and use hadronic Z decays as a specific example.
Publications 1 - 4 of 4