TY  - CONF
A1  - Philipsen, Owe
T1  - Towards a determination of the chiral critical surface of QCD
T2  - Proceedings of Science
N2  - The chiral critical surface is a surface of second order phase transitions bounding the region of
first order chiral phase transitions for small quark masses in the fmu;d;ms;mg parameter space.
The potential critical endpoint of the QCD (T;m)-phase diagram is widely expected to be part of
this surface. Since for m = 0 with physical quark masses QCD is known to exhibit an analytic
crossover, this expectation requires the region of chiral transitions to expand with m for a chiral
critical endpoint to exist. Instead, on coarse Nt = 4 lattices, we find the area of chiral transitions
to shrink with m, which excludes a chiral critical point for QCD at moderate chemical potentials
mB < 500 MeV. First results on finer Nt = 6 lattices indicate a curvature of the critical surface
consistent with zero and unchanged conclusions. We also comment on the interplay of phase
diagrams between the Nf = 2 and Nf = 2+1 theories and its consequences for physical QCD.
Y1  - 2009
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/27286
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-272864
SN  - 1824-8039
N1  - 5th International Workshop on Critical Point and Onset of Deconfinement - CPOD 2009, June 08 - 12 2009, Brookhaven National Laboratory, Long Island, New York, USA
VL  - 2009
IS  - CPOD 2009: 026
PB  - Scuola Internazionale Superiore di Studi Avanzati, SISSA
CY  - Trieste
ER  -