# Quark Matter 2014 - XXIV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

May 19 – 24, 2014
Europe/Zurich timezone

## Understanding the $p/\pi$ ratio at LHC with an extended mass spectrum

May 21, 2014, 10:00 AM
20m

### helium

Contributed Talk Thermodynamics and Hadron Chemistry

### Speaker

Dr Jacquelyn Noronha-Hostler (University of Sao Paulo)

### Description

Recent measurements of the proton to pion ratio from ALICE at the LHC have found it to be lower than the expected ratio anticipated by thermal models. We investigated the role that Hagedorn states- massive resonances with an exponential mass spectrum and large decay widths- play in the determination of particle ratios at LHC through a scenario of multiparticle reactions and dynamical chemical equilibrium within the hadron gas phase. We show that it is possible to describe the lower $p/\pi$ ratio at LHC while still obtaining the experimental ratio of $K/\pi$ in the Hagedorn state scenario if the protons are underpopulated at the switching temperature from hydrodynamics to the hadron gas phase.
On behalf of collaboration: None

### Primary author

Dr Jacquelyn Noronha-Hostler (University of Sao Paulo)

### Co-author

Carsten Greiner (University of Frankfurt)

 Slides