Do lattice data constrain the vector interaction strength of QCD?

• Main Authors: Jan Steinheimer, Stefan Schramm
• Format: Article
• Language: English
• Published: Elsevier 2014-09-01
• Series: Physics Letters B
• Subjects: QCD vector interaction strength; Baryon number susceptibilities
• Online Access: http://www.sciencedirect.com/science/article/pii/S0370269314005206

We show how repulsive interactions of deconfined quarks as well as confined hadrons have an influence on the baryon number susceptibilities and the curvature of the chiral pseudo-critical line in effective models of QCD. We discuss implications and constraints for the vector interaction strength from comparisons to lattice QCD and comment on earlier constraints, extracted from the curvature of the transition line of QCD and compact star observables. Our results clearly point to a strong vector repulsion in the hadronic phase and near-zero repulsion in the deconfined phase.