English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We investigate the order of the QCD chiral transition in the limit ofvanishing bare up/down quark masses and variations of the bare strange-quarkmass $0 \le m_{\mathrm{s}} \le \infty$. In this limit and due to universalitylong range correlations with the quantum numbers of pseudoscalar and scalarmesons may dominate the physics. In order to study the interplay between themicroscopic quark and gluon degrees of freedom and the long range correlationswe extend a combination of lattice Yang--Mills theory and a (truncated) versionof Dyson--Schwinger equations by also taking back-reactions of mesonic degreesof freedom into account. Both this system and the meson backcoupling approachhave been studied extensively in the past but this is the first work in a full$(2 + 1)$-flavor setup. Starting from the physical point, we determine thechiral susceptibilities for decreasing up/down quark masses and find goodagreement with both lattice and functional renormalization group results. Wethen proceed to determine the order of the chiral transition along theleft-hand side of the Columbia plot, for chemical potentials in the range $-(30\,\textrm{MeV})^2 \le \mu_q^2 \le (30 \,\textrm{MeV})^2$. We find asecond-order phase transition throughout and no trace of a first-order regionin the $N_{f} = 3$ corner of the Columbia plot. This result remains unchangedwhen an additional Goldstone boson due to a restored axial $\mathrm{U_A}(1)$ istaken into account.

QCD phase transitions in the light quark chiral limit