J/ψ-hadron correlations at midrapidity in pp collisions at √s = 13 TeV

We report on the measurement of inclusive, non-prompt, and prompt J/ψ-hadron correlations by the ALICE Collaboration at the CERN Large Hadron Collider in pp collisions at a center-of-mass energy of 13 TeV. The correlations are studied at midrapidity ($|y| < 0.9$) in the transverse momentum ranges pT < 40~GeV/c for the J/ψ and 0.15 < pT < 10 GeV/c and |η|<0.9 for the associated hadrons. The measurement is based on minimum bias and high multiplicity data samples corresponding to integrated luminosities of Lᵢₙₜ = 34~nb⁻¹ and Lᵢₙₜ = 6.9~pb⁻¹, respectively. In addition, two more data samples are employed, requiring, on top of the minimum bias condition, a threshold on the tower energy of $E = 4$ and 9~GeV in the ALICE electromagnetic calorimeters, which correspond to integrated luminosities of Lᵢₙₜ = 0.9~pb⁻¹ and Lᵢₙₜ = 8.4~pb⁻¹, respectively. The results are presented as associated hadron yields per J/ψ trigger as a function of the azimuthal angle difference between the associated hadrons and J/ψ mesons. The integrated near-side and away-side correlated yields are also extracted as a function of the J/ψ transverse momentum. The measurements are discussed in comparison to PYTHIA calculations.