engleski

Forward rapidity J/ψ production as a function of charged-particle multiplicity in pp collisions at √s = 5.02 and 13 TeV

The production of J/ψ is measured as a function of charged-particle multiplicity at forward rapidity in proton-proton (pp) collisions at center-of-mass energies √s = 5.02 and 13 TeV. The J/ψ mesons are reconstructed via their decay into dimuons in the rapidity interval (2.5 < y < 4.0), whereas the charged-particle multiplicity density (dN_ch/dη) is measured at midrapidity (|η| < 1). The production rate as a function of multiplicity is reported as the ratio of the yield in a given multiplicity interval to the multiplicity-integrated one. This observable shows a linear increase with charged- particle multiplicity normalized to the corresponding average value for inelastic events (dN_ch/dη/〈dN_ch/dη〉), at both the colliding energies. Measurements are compared with available ALICE results at midrapidity and theoretical model calculations. First measurement of the mean transverse momentum (pT) of J/ψ in pp collisions exhibits an increasing trend as a function of (dN_ch /dη/〈dN_ch/dη〉) showing a saturation towards high charged-particle multiplicities.

Hadron-Hadron Scattering ; J/psi(3100): production ; charged particle: multiplicity ; p p: scattering ; yield: ratio ; multiplicity: density ; rapidity ; dimuon ; ALICE ; transverse momentum ; experimental results ; 5020: 13000 GeV-cms/nucleon

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