Measurement of f$_{1}$(1285) production in pp collisions at $\mathbf{\sqrt{{\textit s}}}$ = 13 TeV

TL;DR

This paper reports the first measurement of the f₁(1285) resonance in proton-proton collisions at 13 TeV, analyzing its production, properties, and comparison with statistical models to understand its quark content.

Contribution

It provides the first experimental measurement of the f₁(1285) resonance at 13 TeV and compares its yield with theoretical predictions to explore its quark structure.

Findings

The mass and yield of f₁(1285) are measured at 13 TeV.

The yield ratio of f₁(1285) to pions agrees with the statistical hadronization model.

The model assuming zero total strangeness reproduces the data within 1σ.

Abstract

This study presents the first measurement of the f$_{1}$(1285) resonance using the ALICE detector in inelastic proton-proton collisions at a center-of-mass energy of 13 TeV. The resonance is reconstructed at midrapidity ($|y| <$ 0.5) through the hadronic decay channel f$_{1} (1285) \rightarrow \mathrm{K^{0}_{S} K^{\pm}\pi^{\mp}}$. Key measurements include the determination of its mass, transverse-momentum integrated yield, and average transverse momentum. Additionally, the ratio of the transverse-momentum integrated yield of f$_{1}$(1285) to pion is compared with calculations from the canonical statistical hadronization model. The model calculation, assuming a zero total strangeness content for f$_{1}$(1285), reproduces the data within 1$\sigma$ deviation, shedding light on the quark composition of f$_{1}$(1285).