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

A bstract 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 p T < 40 GeV /c for the J/ ψ and 0 . 15 < p T < 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 L int = 34 nb − 1 and L int = 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 L int = 0 . 9 pb − 1 and L int = 8 . 4 pb − 1 , respectively. The azimuthally integrated near and away side yields of associated charged hadrons per J/ ψ trigger are presented as a function of the J/ ψ and associated hadron transverse momentum. The measurements are discussed in comparison to PYTHIA calculations.