Recent measurements in high multiplicity proton-proton collisions have shown the emergence of several features that are reminiscent of QGP phenomenology, one of which is the enhanced production of strange and multi-strange hadrons with respect to non-strange ones. Strange hadron production represents a key probe to study QGP formation in hadronic collisions as well as to understand the microscopic mechanisms behind hadronisation.
In this context, the φ meson is certainly a probe of choice for the study of strangeness production and strangeness enhancement altogether. A deeper knowledge of the production probability of single and multiple φ mesons can help validate or disqualify the inner workings of a given phenomenological model through comparisons to related Monte Carlo generators.
Multiple φ meson production measurement can also be combined with the measurement of the inclusive φ-meson yield to allow a number of new insights on the number of φ-meson production distribution (the probability of producing N φ mesons in one event). Important among these is the fact we can measure the variance of such distributions and determine how it compares to a Poissonian distribution. Furthermore, the 2-Dimensional nature of the yield spectrum of φ-meson pairs gives new perspectives for the study of the dynamics of the particle production, notably by measuring the mean pT of the spectra of a φ meson in events where a second φ meson is produced with a given pT. An overview of such results is presented and will be discussed in comparison to Monte Carlo generators.