1. PanScales parton showers for hadron collisions: formulation and fixed-order studies
- Author
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Melissa van Beekveld, Silvia Ferrario Ravasio, Gavin P. Salam, Alba Soto-Ontoso, Gregory Soyez, Rob Verheyen, Institut de Physique Théorique - UMR CNRS 3681 (IPHT), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Nuclear and High Energy Physics ,spin: correlation ,Astrophysics::High Energy Astrophysical Phenomena ,collinear ,FOS: Physical sciences ,parton: showers ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,color: singlet ,High Energy Physics::Experiment ,initial state ,hadron hadron: scattering ,dipole - Abstract
We formulate PanScales parton showers for hadron collisions so as to achieve next-to-leading logarithmic (NLL) accuracy across a broad set of observables. We do so specifically for colour singlet production. Relative to the existing PanScales final-state showers, the main new question is that of how to redistribute momentum imbalances from initial-state branching across the remainder of the event. We presents tests of the showers at fixed order, including the treatment of full colour for soft-collinear emissions and of spin correlations in both the soft and collinear domains. We also include comparisons to a formulation of a standard dipole shower, the current leading-logarithmic state of the art. A forthcoming companion paper will explore all-order tests of the new showers., 65 pages, 15 figures; v2 includes additional clarifications and comparisons, as accepted for publication in JHEP
- Published
- 2022
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