• Kenji Morita

      Articles written in Pramana – Journal of Physics

    • Analysis of one-and two-particle spectra at RHIC based on a hydrodynamical model

      Tetsufumi Hirano Kenji Morita Shin Muroya Chiho Nonaka

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      We calculate the one-particle hadronic spectra and correlation functions of pions based on a hydrodynamical model. Parameters in the model are so chosen that the one-particle spectra reproduce experimental results of √s= 130 AGeV Au + Au collisions at RHIC. Based on the numerical solution, we discuss the space-time evolution of the fluid. Two-pion correlation functions are also discussed. Our numerical solution suggests the formation of the quark-gluon plasma with large volume and low net baryon density.

    • Charmonium states in quark-gluon plasma

      Su Houng Lee Kenji Morita

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      We discuss how the spectral changes of quarkonia at $T_{c}$ can reflect the `critical' behaviour of QCD phase transition. Starting from the temperature dependencies of the energy density and pressure from lattice QCD calculation, we extract the temperature dependencies of the scalar and spin-2 gluon condensates near $T_{c}$ . We also parametrize these changes into the electric and magnetic condensate near $T_{c}$. While the magnetic condensate hardly changes across $T_{c}$, we find that the electric condensate increases abruptly above $T_{c}$. Similar abrupt change is also seen in the scalar condensate. Using the QCD second-order Stark effect and QCD sum rules, we show that these sudden changes induce equally abrupt changes in the mass and width of $J/\psi$, both of which are larger than 100 MeV at slightly above $T_{c}$.

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