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