# Quark Matter 2018

13-19 May 2018
Venice, Italy
Europe/Zurich timezone
The organisers warmly thank all participants for such a lively QM2018! See you in China in 2019!

## f0(980) resonance production in pp collisions with the ALICE detector at LHC

15 May 2018, 17:00
2h 40m
First floor and third floor (Palazzo del Casinò)

### Speaker

Alessandra Lorenzo (Universita e INFN, Bologna (IT))

### Description

We report on a preliminary study of the production of f$_{0}$(980)$\rightarrow \pi^{+}\pi^{-}$ at mid-rapidity ($\vert y \vert$ < 0.5) performed with the ALICE detector at the LHC in minimum bias pp collisions at centre-of-mass energy $\sqrt{\mathit{s}}$ = 5.02 TeV. The f$_{0}$(980) signal extraction is challenging due to the large background from correlated $\pi^{+}\pi^{-}$ pairs from resonance decays in the invariant mass window under study, as well as due to the combinatorics from uncorrelated pairs. We present in detail the strategy followed for the signal extraction and first results in terms of $p_{\mathrm{T}}$-dependent production yields. Results are discussed and compared with production yields of other resonances and stable hadrons.
Short-lived hadronic resonances are a useful sampling tool for the late hadronic phase of ultra-relativistic heavy-ion collisions since their lifetimes are of the same order of magnitude as the time span between the chemical and kinetic freeze-out, tipically estimated to be about 10 fm/$c$ for central collisions. Our study in pp collisions provides a feasibility check and constitutes a reference for the measurement in high-multiplicity events (p-Pb, Pb-Pb).
The nature of the f$_0$(980) remains elusive: different interpretation of this resonance including $q\bar{q}$ states, bound states of hadrons such as $K\bar{K}$, and as tetraquark candidate are available. Studies in different collision systems are particularly interesting because they can provide information about the nature of this particle.

Content type Experiment ALICE Presenter name already specified

### Primary author

Alessandra Lorenzo (Universita e INFN, Bologna (IT))

### Presentation Materials

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