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.
Aad, G., et al. "Observation of double parton scattering in same-sign W boson pair production in pp collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector." Physics Letters. B, vol. 870, Sep. 2025. https://doi.org/10.1016/j.physletb.2025.139892
Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N.J., Abidi, S.H., Aboelela, M., Aboulhorma, A., Abramowicz, H., Abulaiti, Y., Acharya, B.S., Ackermann, A., Bourdarios, C.Adam, Adamczyk, L., Addepalli, S.V., Addison, M.J., Adelman, J., ... Zwalinski, L. (2025). Observation of double parton scattering in same-sign W boson pair production in pp collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector. Physics Letters. B, 870. https://doi.org/10.1016/j.physletb.2025.139892
Aad, G., Aakvaag, E., Abbott, B., et al., "Observation of double parton scattering in same-sign W boson pair production in pp collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector," Physics Letters. B 870 (2025), https://doi.org/10.1016/j.physletb.2025.139892
@article{osti_3020337,
author = {Aad, G. and Aakvaag, E. and Abbott, B. and Abdelhameed, S. and Abeling, K. and Abicht, N.J. and Abidi, S.H. and Aboelela, M. and Aboulhorma, A. and Abramowicz, H. and others},
title = {Observation of double parton scattering in same-sign W boson pair production in pp collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector},
annote = {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.},
doi = {10.1016/j.physletb.2025.139892},
url = {https://www.osti.gov/biblio/3020337},
journal = {Physics Letters. B},
issn = {ISSN 0370-2693},
volume = {870},
place = {United States},
publisher = {Elsevier},
year = {2025},
month = {09}}
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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 506, Issue 3https://doi.org/10.1016/S0168-9002(03)01368-8
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