Observation of double parton scattering in same-sign W boson pair production in pp collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

Abstract

This letter reports the measurement of double parton scattering in same-sign W boson pair production with the ATLAS detector. The data set used corresponds to an integrated luminosity of 140 fb${}^{-1}$ of proton-proton collisions at a center-of-mass energy of 13 TeV, collected during Run 2 of the Large Hadron Collider. The study is performed in final states including two same-charge leptons, electron or muon, missing transverse momentum, and up to one jet. An excess of events is observed over the expected background contributions with a significance of 8.8 standard deviations. The measured fiducial cross section times leptonic branching fraction is $4.59\pm 0.64$ fb. The measurement corresponds to a double parton scattering effective cross section of $10.6\pm 1.8$ mb.

arXiv comment42 pages in total, author list starting page 25, 5 figures, 4 tables, published in Phys. Lett. B. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2022-18/

References in corpus (26)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• A Brief Introduction to PYTHIA 8.1
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• PDF4LHC recommendations for LHC Run II
• Scattering Amplitudes with Open Loops
• Herwig 7.0 / Herwig++ 3.0 Release Note
• A parton shower algorithm based on Catani-Seymour dipole factorisation
• QCD Matrix Elements + Parton Showers
• Comix, a new matrix element generator
• Event Generation with Sherpa 2.2
• QCD matrix elements + parton showers: The NLO case
• QCD matrix elements and truncated showers
• Limits and Confidence Intervals in the Presence of Nuisance Parameters
• A critical appraisal of NLO+PS matching methods
• Single-top t-channel hadroproduction in the four-flavour scheme with POWHEG and aMC@NLO
• Double Parton Distributions Incorporating Perturbative QCD Evolution and Momentum and Quark Number Sum Rules
• Same-sign W pair production as a probe of double parton scattering at the LHC
• Some Dipole Shower Studies
• Double hard scattering without double counting
• Parton correlations in same-sign $W$ pair production via double parton scattering at the LHC
• Proof of sum rules for double parton distributions in QCD
• A Monte-Carlo Simulation of Double Parton Scattering