Measurement of angular correlations inside jets induced by gluon polarization in proton-proton collisions at $\sqrt{s}$ = 13.6 TeV

The CMS collaboration
Hayrapetyan, Aram , Makarenko, Vladimir , Tumasyan, Armen , Adam, Wolfgang , Benato, Lisa , Bergauer, Thomas , Dragicevic, Marko , Hussain, Priya Sajid , Jeitler, Manfred , Krammer, Natascha
CMS-SMP-25-006, 2026.

Abstract (data abstract)
A study of angular correlations arising from 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 correspond to an integrated luminosity of 34.7 $fb^{-1}$, collected in 2022 with the CMS detector at the LHC.The details of the parton shower are investigated using jets reconstructed with the $anti-k_T$ algorithm and declustered with the Cambridge–Aachen algorithm.A novel analysis technique is developed to identify characteristic features of the jet substructure and to select intermediate gluon splittings into quark-antiquark pairs.An observable sensitive to gluon polarization in the shower is measured and compared with PYTHIA 8 and HERWIG 7 model predictions, with and without spin correlations.The results support the predictions that include gluon polarization effects, while strongly disfavoring models that neglect them.

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