The transverse momentum ($p_{\mathrm{T}}$) spectra of charged pions, kaons and (anti)protons in pp collisions at the Large Hadron Collider (LHC) energies encode information about string interactions, which become more prominent in events with high event activity. These interactions can generate radial flow–like effects that depend on hadron mass. In particular, the proton-to-pion ratio as a function of $p_{\mathrm{T}}$ exhibits a characteristic bump at intermediate $p_{\mathrm{T}}$ (2--10\,GeV/$c$), whose magnitude increases with event activity, while at higher $p_{\mathrm{T}}$ the ratios show little or no dependence on event activity. Such features resemble those observed in heavy-ion collisions, where they are commonly attributed to the formation of a strongly interacting quark-gluon plasma.

In this contribution, measurements of $p_{\mathrm{T}}$ spectra in pp collisions at $\sqrt{\textit{s} }= 13.6$ TeV are presented. The analysis is based on a data sample approximately 85 times larger than that used in a comparable Run 2 study. The pion (kaon and proton) $p_{\mathrm{T}}$ spectra are measured from 2 GeV/$c$ (3 GeV/$c$) up to 20 GeV/$c$. The $p_{\mathrm{T}}$ spectra are reported as a function of the event activity measured with the FT0 detector. Particle identification is performed via the specific energy loss measured in the Time Projection Chamber. Particle ratios and yields are compared to results from Monte Carlo event generators.