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Study of thermal particle production is crucial to understand the space-timeevolution of the fireball produced in high energy heavy-ion collisions. Weconsider thermal particle production within the framework of relativisticviscous hydrodynamics and employ recently obtained analytical solutions ofhigher-order viscous hydrodynamics with longitudinal Bjorken expansion tocalculate the spectra of dileptons and photons. Using these analyticalsolutions, we constrain the allowed initial states by demanding positivity andreality of energy density throughout the evolution. Further, we compute thermalparticle spectra and study the particle yield in context of hydrodynamicattractors. We find that, of all allowed solutions, the evolution correspondingto attractor solution leads to maximum production of thermal particles.

Hydrodynamical attractor and thermal particle production in heavy-ion collision