Speaker
Description
Motivated by the recent lattice study by the FASTSUM collaboration [1],
thermal masses of the baryon parity-doublers are explored for
various pion masses [2]. A general trend of the octet and decuplet
parity-doublers is consistent to the results in [1], whereas their
hyperon masses are modified to a large extent for the physical pion mass.
We further investigate the fluctuations and correlations involving
baryon number in hot hadronic matter with modified masses of
negative-parity baryons, in the context of the hadron resonance gas
[3]. Confronting the baryon number susceptibility, baryon-charge
correlation, and baryon-strangeness correlation and their ratios
with the lattice QCD data, we show that the strong downward mass
shift in hyperons can accidentally reproduce some correlation
ratios, however it also tends to overshoot the individual
fluctuations and correlations. This indicates that a consistent framework
of in-medium effects beyond hadron mass shifts is required.
Selected topics on the partity doublers at high density are also
presented briefly [4,5].
References
[1] G. Aarts, et al., JHEP 1706, 034 (2017).
[2] C. Sasaki, Nucl.Phys.A 970, 388 (2018).
[3] K. Morita, C. Sasaki, P. M. Lo and K. Redlich, ``Overlap between Lattice QCD and HRG with in-medium effects and parity doubling,'' arXiv:1711.10779 [hep-ph].
[4] M. Marczenko, C. Sasaki, Phys.Rev.D 97, no. 3, 036011 (2018).
[5] M. Marczenko, D. Blaschke, K. Redlich and C. Sasaki, to appear.
