Abstract
We analyse the behaviour of hyperons with strangeness S = –1,–2,–3 in the hadronic and quark gluon plasma phases, with particular interest in parity doubling and its emergence as the temperature grows. This study uses our FASTSUM anisotropic Nf = 2+1 ensembles, with four temperatures below and four above the deconfinement transition temperature, Tc. The positive-parity groundstate masses are found to be largely temperature independent below Tc, whereas the negative-parity ones decrease considerably as the temperature increases. Close to the transition, the masses are almost degenerate, in line with the expectation from chiral symmetry restoration. This may be of interest for heavy-ion phenomenology. In particular we show an application of this effect to the Hadron Resonance Gas model. A clear signal of parity doubling is found above Tc in all hyperon channels, with the strength of the effect depending on the number of s-quarks in the baryons.
Highlights
In nature, at zero temperature there is a large difference in mass (∼ 500 MeV > ΛQCD ) between the negative- and positive-parity baryonic groundstates
It is well known that this large mass gap is due to the spontaneous breaking of chiral symmetry, and to the small explicit breaking of chiral symmetry coming from the masses of the light quarks
In this work we considered octet and decuplet hyperons at non-zero temperature and found that there is a clear emergence of parity doubling around the crossover temperature Tc due to the restoration of chiral symmetry
Summary
https://doi.org/10.1051/epjconf/201817507016 above the crossover temperature Tc. Correlators and spectral functions (comprising also the nucleon and ∆-baryon) can be found in the previous works [1, 6,7,8].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
