Speaker
Pok Man Lo
(GSI)
Description
Motivated by recent lattice QCD (LQCD) studies on fluctuations of conserved charges and
their interpretation within the Hadron Resonance Gas (HRG) model, we explore the effects
of interactions on strangeness fluctuations in hadronic matter at finite temperature. We
focus on the s-wave K-pi interactions and discuss the role of the attractive isospin-1/2
channel, with the broad $\kappa(869)$ and the $K*(1430)$ resonances, as well as the
repulsive isospin-3/2 channel. The interaction contributions to the thermodynamics are
handled within the S-matrix formalism using the empirical K-pi phase shifts as input.
We show that a simplified treatment of interactions in this channel, using a
Breit-Wigner spectral function for each resonance, as frequently employed in applications
of the hadron resonance gas, systematically overestimates the strangeness fluctuations.
Thus, when modeling the LQCD results and experimental data on strangeness fluctuations
the contribution of broad resonances must be treated with particular caution.
| On behalf of collaboration: | NONE |
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Authors
Bengt Friman
(GSI)
Krzysztof Redlich
(University of Wroclaw)
Pok Man Lo
(GSI)
