Speaker
Description
A measurement of the production of two longitudinally polarised Z bosons is presented based on proton–proton collision data, recorded by ATLAS during Run 3 of the Large Hadron Collider, corresponding to an integrated luminosity of 164 $fb^{-1}$ at a centre-of-mass energy of 13.6 TeV. The ZZ candidate events are reconstructed using two same-flavour opposite-charge electron or muon pairs. Polarization fractions of the Z boson pair are measured in the fiducial phase space and also in two bins of the four-lepton invariant mass. After a statistical combination with the measurement using Run 2 data, first observation of the production of two simultaneously longitudinally polarised Z bosons is obtained, with the observed and expected significances of 5.5 and 4.8 standard deviations, respectively.
| 请选择分会 | TeV物理和超出标准模型新物理 |
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