Next-to-leading-logarithmic PanScales showers for Deep Inelastic Scattering and Vector Boson Fusion

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.

34 pages + 10 pages of Appendices, 13 figures

References in corpus (19)

• PYTHIA 6.4 Physics and Manual
• An Introduction to PYTHIA 8.2
• Event generation with SHERPA 1.1
• Herwig++ Physics and Manual
• LHAPDF6: parton density access in the LHC precision era
• A parton shower algorithm based on Catani-Seymour dipole factorisation
• An NNLO subtraction formalism in hadron collisions and its application to Higgs boson production at the LHC
• The Path to Proton Structure at One-Percent Accuracy
• Higgs-boson production through gluon fusion at NNLO QCD with parton showers
• A modified CKKW matrix element merging approach to angular-ordered parton showers
• Extending CKKW-merging to One-Loop Matrix Elements
• PanScales parton showers for hadron collisions: formulation and fixed-order studies
• Parton showering with higher-logarithmic accuracy for soft emissions
• PanScales showers for hadron collisions: all-order validation
• Towards NNLO+PS Matching with Sector Showers
• Initial State Radiation in the Herwig 7 Angular-Ordered Parton Shower
• Lund and Cambridge multiplicities for precision physics
• NNLO QCD corrections to weak boson fusion Higgs boson production in the $H\to b\bar{b}$ and $H\to W{W}^{\ast }\to 4l$ decay channels
• The Qt distribution of the Breit current hemisphere in DIS as a probe of small-x broadening effects

Cited by in corpus (11)

• A POWHEG generator for deep inelastic scattering
• Introduction to the PanScales framework, version 0.1
• Logarithmically-accurate and positive-definite NLO shower matching
• Les Houches 2023 -- Physics at TeV Colliders: Report on the Standard Model Precision Wishlist
• Deep-Inelastic Scattering at TeV Energies with LHC Muons
• Observation and differential cross section measurement of neutral current DIS events with an empty hemisphere in the Breit frame
• Higgs production via vector-boson fusion at the LHC
• Sudakov evolution without unitarity
• Collinear and TMD distributions with dynamical soft-gluon resolution scale
• Multi-Jet Production in Deep Inelastic Scattering with Pythia
• Event generation at MEPS@NLO accuracy in neutral and charged current DIS at the EIC