Physicists confirm rare particle interaction predicted by Standard Model
Researchers at CERN's ATLAS detector have definitively observed an exotic particle collision involving a W boson and photon—a phenomenon that tests the fundamental rules governing particle behavior. The finding validates theoretical predictions with 99.9999% certainty, strengthening confidence in our understanding of physics at the smallest scales and informing the design of next-generation particle detectors and experiments.
Originaltitel: Fiducial and differential cross-section measurements of electroweak <em>W</em>γ<em>jj</em> production in <em>pp</em> collisions at √<em>s</em>=13 TeV with the ATLAS detector
<p>The observation of the electroweak production of a W boson and a photon in association with two jets, using pp collision data at the Large Hadron Collider at a centre of mass energy of root s =13 TeV, is reported. The data were recorded by the ATLAS experiment from 2015 to 2018 and correspond to an integrated luminosity of 140 fb(-1). This process is sensitive to the quartic gauge boson couplings via the vector boson scattering mechanism and provides a stringent test of the electroweak sector of the Standard Model. Events are selected if they contain one electron or muon, missing transverse momentum, at least one photon, and two jets. Multivariate techniques are used to distinguish the electroweak W gamma jj process from irreducible background processes. The observed significance of the electroweak W gamma jj process is well above six standard deviations, compared to an expected significance of 6.3 standard deviations. Fiducial and differential cross sections are measured in a fiducial phase space close to the detector acceptance, which are in reasonable agreement with leading order Standard Model predictions from MadGraph5+Pythia8 and Sherpa. The results are used to constrain new physics effects in the context of an effective field theory.</p>