Journal Article

FZJ-2026-03094

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png QCD deconfinement transition line up to $μ_B = 400$ MeV from finite volume lattice simulations

Borsányi, S. ; Fodor, Z.FZJ* ; Guenther, J. N. ; Parotto, P. ; Pásztor, A. ; Pirelli, L. ; Szabó, K. K.FZJ* ; Wong, C. H.

2024
American Physical Society Ridge, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevD.110.114507  doi:10.34734/FZJ-2026-03094

Abstract: The QCD crossover line in the temperature ($𝑇$)-baryochemical potential ($𝜇_𝐵$) plane has been computed by several lattice groups by calculating the chiral order parameter and its susceptibility at finite values of $𝜇_𝐵$. In this work we focus on the deconfinement aspect of the transition between hadronic and quark gluon plasma phases. We define the deconfinement temperature as the peak position of the static quark entropy $[S_Q(𝑇,𝜇_𝐵)]$ in $𝑇$, which is based on the renormalized Polyakov loop. We extrapolate $S_Q(𝑇,𝜇_𝐵)$ based on high statistics finite temperature ensembles on a $16^3 ×8$ lattice to finite density by means of a Taylor expansion to eighth order in $𝜇_𝐵$ (NNNLO) along the strangeness neutral line. For the simulations the 4HEX staggered action was used with $2+1$ flavors at physical quark masses. In this setup the phase diagram can be drawn up to unprecedentedly high chemical potentials. Our results for the deconfinement temperature are in rough agreement with phenomenological estimates of the freeze-out curve in relativistic heavy ion collisions. In addition, we study the width of the deconfinement crossover. We show that up to $𝜇_𝐵 ≈400$  MeV, the deconfinement transition gets broader at higher densities, disfavoring the existence of a deconfinement critical endpoint in this range. Finally, we examine the transition line without the strangeness neutrality condition and observe a hint for the narrowing of the crossover towards large $𝜇_𝐵$.

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Contributing Institute(s):

1. Jülich Supercomputing Center (JSC)

Research Program(s):

1. 5111 - Domain-Specific Simulation & Data Life Cycle Labs (SDLs) and Research Groups (POF4-511) (POF4-511)
2. 05P21PXFCA - Verbundprojekt 05P2021 (ErUM-FSP T06) - Aufbau von CBM bei FAIR: Compressed-Baryonic-Matter-Physik an FAIR: Gittersimulationen zur starken Wechselwirkung mit endlicher Baryonendichte (BMBF-05P21PXFCA) (BMBF-05P21PXFCA)
3. NRW-FAIR (NW21-024-A) (NW21-024-A)
4. DFG project G:(GEPRIS)496127839 - Phasendiagramm und Phenomenologie des QCD Übergangs (496127839) (496127839)

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Database coverage:
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