Mixing of vector and axial mesons at finite temperature: an indication towards chiral symmetry restoration

Dileptons in high-energy heavy-ion collisions

“…[34], where a linear σπρa 1 model, consistently constructed to 1-loop order with realistic vacuum properties, has been applied at finite temperature. It is found that, even if the vacuum ρ mass at tree level is entirely given through the qq condensate, the vanishing of the latter at T c does not significantly impact m ρ (T c ) due to different (leading) temperature dependencies of the two quantities [16]. The main effect was rather a substantial broadening of both the ρ and a 1 spectral functions.…”

“…'bare' αs corrections Mass= chiral V-A mixing [16] to qq annihilation [18,19] In the invariant-mass window between 1 and 1.5 GeV, the main source of hadronic dilepton production is due to πa 1 annihilation [15]. This, in fact, can be understood as a pion-induced mixing between the axialvector and vector correlator (and vice versa) to lowest order in temperature, characterized by the parameter ǫ = T 2 /6f 2 π (chiral limit) [16].…”

Vector and axial-vector mesons at finite temperature

“…where we choose the kinematic covariants as To find the invariant amplitudes Π t,l we form the scalars 12) when Eq. (A.9) gives…”

Properties of vector mesons at finite temperature: Effective Lagrangian approach

“…al. [6] that in the lowest order of ǫ = T 2 /6f 2 π , where the pion decay constant f π = 93 MeV, there is no change in the vector meson mass and only mixing between vector and axial-vector correlator takes place.…”