Compact Muon Solenoid
LHC, CERN
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| CMS-PAS-SMP-25-006 | ||
| Measurement of spin correlations induced by gluon polarization in parton showers | ||
| CMS Collaboration | ||
| 2025-09-30 | ||
| Abstract: A study of angular correlations induced by gluon polarization effects inside jets is performed using proton-proton collisions at a center-of-mass energy of $ \sqrt{s}= $ 13.6 TeV. The data, corresponding to an integrated luminosity of 34.7 fb$ ^{-1} $, were collected in 2022 with the CMS detector at the LHC. The details of the parton shower are studied using jets reconstructed with the anti-$ k_\textrm{T} $ algorithm and declustered with the Cambridge--Aachen algorithm. A new technique is developed to identify features in jet substructure and to select intermediate gluon splittings into quark-antiquark pairs. An observable sensitive to the gluon polarization effect is compared with PYTHIA 8 and HERWIG 7 parton-shower predictions, with and without spin correlations. The data confirm model predictions that include gluon polarization effects, while strongly disfavoring models without it. | ||
| Links: CDS record (PDF) ; CADI line (restricted) ; | ||
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Compact Muon Solenoid LHC, CERN |
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