Physicists spot rare collision events that could reshape particle physics
ATLAS researchers detected an unexpected particle phenomenon—double parton scattering—with near-certainty, opening new windows into how matter behaves at extreme energies. The finding could refine models underpinning next-generation physics experiments and industrial applications relying on particle collision data.
Originaltitel: Observation of double parton scattering in same-sign W boson pair production in pp collisions at √s=13 TeV with the ATLAS detector
<p>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<sup>−1</sup> 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.</p>