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

Summary, in English

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±0.64 fb. The measurement corresponds to a double parton scattering effective cross section of 10.6±1.8 mb. © 2025 The Authors.

• Author: G. Aad; T.P.A. Åkesson; K.S.V. Astrand; L. Calic; C. Doglioni; P.A. Ekman; V. Hedberg; H. Herde; B. Konya; E. Lytken; R. Poettgen; O. Smirnova; N. Sur; E.J. Wallin; L. Zwalinski
• Department/s: Particle and nuclear physics; eSSENCE: The e-Science Collaboration; Department of Physics
• Publishing year: 2025
• Language: English
• Publication/Series: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
• Volume: 870
• Links: http://dx.doi.org/10.1016/j.physletb.2025.139892
• Document type: Journal article
• Publisher: Elsevier
• Topic: Subatomic Physics
• Keywords: DPS; Same-sign WW
• Status: Published
• ISBN/ISSN/Other: ISSN: 0370-2693