Composite reweighting SU(2) QCD at finite temperature

The Glasgow reweighting method is evaluated for SU(2) lattice gauge theory at nonzero μ and finite T. We establish that the 'overlap problem' of SU(3) measurements, in which the transition points determined from thermodynamic observables have an unphysical dependence on the value of μ used to generate ensembles for reweighting, persists for SU(2). By combining the information from different lattice ensembles we alleviate sampling bias in the fugacity expansion, and identify the Lee-Yang zeros associated with the transition to a high density phase that can plausibly be associated with diquark condensation. We also confirm the existence of a line of first order transitions above a critical point in the T-μ phase plane previously predicted by effective chiral lagrangian calculations