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Article
Report number	arXiv:2305.08645 ; CERN-TH-2023-079 ; OUTP-23-05P
Title	Next-to-leading-logarithmic PanScales showers for Deep Inelastic Scattering and Vector Boson Fusion
Author(s)	van Beekveld, Melissa (Oxford U., Theor. Phys.) ; Ferrario Ravasio, Silvia (CERN)
Publication	2024-02-01
Imprint	2023-05-15
Number of pages	50
In:	JHEP 2402 (2024) 001
DOI	10.1007/JHEP02(2024)001 (publication)
Subject category	hep-ph ; Particle Physics - Phenomenology
Abstract	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). We extensively test and verify the NLL accuracy of the new showers at both fixed order and all orders across a wide range of observables. We also introduce a generalisation of the Cambridge-Aachen jet algorithm and formulate new DIS observables that exhibit a simple resummation structure. The NLL showers are compared to a standard transverse-momentum ordered dipole shower, serving as a proxy for the current state-of-the-art leading-logarithmic showers available in public codes. Depending on the observable, we find discrepancies at NLL of the order of $15\%$. We also present some exploratory phenomenological results for Higgs production in VBF. This work enables, for the first time, to resum simultaneously global and non-global observables for the VBF process at NLL accuracy.
Copyright/License	publication: © 2024-2025 The Authors (License: CC BY 4.0), sponsored by SCOAP³ preprint: (License: CC BY 4.0)

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