Speaker
Description
Recent CMS measurements of high-multiplicity jets in pp collisions at centre of mass energy 13 TeV have revealed an enhancement of jet-frame elliptic anisotropy at large charged-particle multiplicity. This study investigates the momentum-scale and longitudinal structure of these correlations using PYTHIA8 simulations of anti-kT, R=0.8, high-pT jets. Two-particle correlations are constructed in the jet reference frame as functions of Δη∗ and Δϕ∗, with the correlation structure investigated differentially in the transverse momentum relative to the jet axis, jT. The second-order azimuthal harmonics, v2∗ is studied as functions of jT, jet charged-particle multiplicity, and pseudorapidity separation. This provides a momentum- and longitudinal-scale resolved characterization of the correlation structure, and probing its sensitivity to the underlying QCD dynamics. Experimental validations of these predictions with LHC Run 3 data could also provide further insights into these long-range correlations and the dynamics of the small systems.