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arXiv · 2205.02237

PanScales parton showers for hadron collisions: formulation and fixed-order studies

Melissa van Beekveld·Silvia Ferrario Ravasio·Gavin P. Salam·Alba Soto-Ontoso·Gregory Soyez·Rob Verheyen
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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.

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Melissa van Beekveld, Silvia Ferrario Ravasio, Gavin P. Salam, Alba Soto-Ontoso, Gregory Soyez, Rob Verheyen. 2022-05-04. PanScales parton showers for hadron collisions: formulation and fixed-order studies. https://doi.org/10.1007/jhep11(2022)019

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