Figure 3

The normalized ψ(2S) yield and the ratio of normalized ψ(2S)-over-J/ ψ yields at 2.5 < ycms < 4.0 as a function of the normalized charged-particle pseudorapidity density in pp collisions at √s = 13 TeV. Measurements are compared with the following models: PYTHIA 8.2 [43], PYTHIA 8.2 without color reconnection (no CR) [43], comovers [5]. Quoted is the correlated event-class normalization uncertainty.