@article{10902/32544, year = {2023}, month = {9}, url = {https://hdl.handle.net/10902/32544}, abstract = {The first observation of the production of W±W± bosons from double parton scattering processes using same-sign electron-muon and dimuon events in proton-proton collisions is reported. The data sample corresponds to an integrated luminosity of 138 fb−¹ recorded at a center-of-mass energy of 13 TeV using the CMS detector at the CERN LHC. Multivariate discriminants are used to distinguish the signal process from the main backgrounds. A binned maximum likelihood fit is performed to extract the signal cross section. The measured cross section for production of same-sign W bosons decaying leptonically is 80.7 ± 11.2 (stat) +9.5 −8.6 (syst) ± 12.1 (model) fb, whereas the measured fiducial cross section is 6.28 ± 0.81 (stat) ± 0.69 (syst) ± 0.37 (model) fb. The observed significance of the signal is 6.2 standard deviations above the background-only hypothesis.}, publisher = {American Physical Society}, publisher = {Physical Review Letters, 2023, 131(9), 091803}, title = {Observation of same-sign WW production from double parton scattering in proton-proton collisions at √s= 13 Te V}, author = {Tumasyan A. and Brochero Cifuentes, Javier Andrés and Cabrillo Bartolomé, José Iban and Calderón Tazón, Alicia and Duarte Campderros, Jorge and Fernández García, Marcos and Fernández Madrazo, Celia and García Alonso, Andrea and Gómez Gramuglio, Gervasio and Lasaosa García, Clara and Martínez Rivero, Celso and Martínez Ruiz del Árbol, Pablo and Matorras Weinig, Francisco and Matorras Cuevas, Pablo and Piedra Gómez, Jonatan and Prieëls, Cedric and Ruiz Jimeno, Alberto and Scodellaro, Luca and Vila Álvarez, Iván and Vizán García, Jesús Manuel}, }