Baryonic susceptibilities, quark-diquark models, and quark-hadron duality at finite temperature
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American Physical Society
E. Megías, E. Ruiz Arriola, and L. L. Salcedo. Baryonic susceptibilities, quark-diquark models, and quark-hadron duality at finite temperature. Phys. Rev. D 99, 074020 [https://doi.org/10.1103/PhysRevD.99.074020]
SponsorshipThis work is supported by the Spanish MINECO and European FEDER funds (Grants No. FIS2014-59386-P and No. FIS2017-85053-C2-1-P), Junta de Andalucía (Grant No. FQM-225), and by the Consejería de Conocimiento, Investigación y Universidad of the Junta de Andalucía and European Regional Development Fund (ERDF) Grant No. SOMM17/6105/UGR. The research of E. M. is also supported by the Ramón y Cajal Program of the Spanish MINECO (Grant No. RYC-2016-20678).
Fluctuations of conserved charges such as baryon number, electric charge, and strangeness may provide a test for completeness of states in lattice QCD for three light flavors. We elaborate on the idea that the corresponding susceptibilities can be saturated with excited baryonic states with an underlying quark-diquark structure with a linearly confining interaction. Using Polyakov-loop correlators, we show that in the static limit, the quark-diquark potential coincides with the quark-antiquark potential in marked agreement with recent lattice studies. We thus study in a quark-diquark model the baryonic fluctuations of electric charge, baryon number, and strangeness—χBQ, χBB, and χBS—by considering a realization of the hadron resonance gas model in the light flavor sector of QCD. These results are obtained by using the baryon spectrum computed within a relativistic quark-diquark model, leading to an overall good agreement with the spectrum obtained with other quark models and with lattice data for the fluctuations.