PUB - Publikationen an der Universität Bielefeld

The breaking of the taste symmetry is studied in the temperature rangebetween 140 MeV to 550 MeV. In order to investigate this violation we havecalculated the screening masses of the various taste states fitting theexponential decay of the spatial correlators. The computation has beenperformed using dynamical Nf = 2+1 gauge field configurations generated withthe p4 staggered action along the Line of Constant Physics (LCP) defined by apion mass $m_\pi$ of approximately 220 MeV and the kaon mass $m_K$ equals 500MeV. For temperatures below the transition an agreement with the predictions ofthe staggered chiral perturbation theory has been found and no temperatureeffect can be observed on the taste violation. Above the transition the tastesplitting still shows an O(a^2) behavior but with a temperature dependentslope. In addition to the analysis done for the pion multiplet we haveperformed an analogous computation for the light-strange and strange mesons andalso looked at the scalar, vector and axial vector channels to understand howthe multiplets split at finite temperature. Finally the temperature dependenceof the pion decay constant $f_{\pi}$ is investigated to get further informationabout the chiral symmetry restoration.