Hadronic resonance production measured by ALICE at the LHC

20 May 2014, 11:30
helium (darmstadtium)



Schlossgraben 1 64283 Darmstadt Germany
Contributed Talk QCD at High Temperature and/or Density QCD at high temperature and/or density


Francesca Bellini (Universita e INFN (IT))


Hadronic resonances constitute a valuable probe for the properties of the medium formed in heavy-ion collisions. In particular, they provide information on particle-formation mechanisms, the properties of the medium at freeze-out, and they contribute to the systematic study of energy loss and recombination. The study of resonance production in other collision systems such as pp and p-Pb form a necessary baseline to disentangle initial-state effects from genuine medium-induced effects. The ALICE experiment has measured the production of the K(892)$^{0}$ and $\phi$(1020) resonances at mid-rapidity in different collision systems at LHC energies. Resonances are reconstructed via their hadronic decay in a wide momentum range, by exploiting the excellent particle-identification capabilities of the Time-Projection Chamber and the Time-of-Flight system. The first results on K(892)$^{0}$ and $\phi$(1020) production in p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV at the LHC will be presented. The resonance mass and width, transverse momentum spectra and yields are measured and reported as a function of the multiplicity of the p-Pb collision. Ratios of resonance to long-lived hadron production in Pb-Pb are compared with the same quantities measured in pp and p-Pb collisions, in order to investigate re-scattering effects. The nuclear modification factors ($R_{\rm AA}$, $R_{\rm pPb}$), recently measured up to high $p_{\mathrm{T}}$ for resonances, are compared to the same measurement for long lived hadrons. The results are discussed in comparison with measurements at lower energies and theoretical predictions.
On behalf of collaboration: ALICE

Primary author

Francesca Bellini (Universita e INFN (IT))

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