Search for Charm/Bottom Nuclei and Heavy Hadron Spectroscopy

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We study new states of hadrons and nuclei including a heavy quark, charm and bottom. Comparison with the light quark sector, a new symmetry called "heavy quark symmetry" is realized. Respecting the heavy quark symmetry, we construct a heavy meson effective theory in which a systematic expansion by 1/M, M is a heavy quark mass, can be done.Several types of heavy hadrons, DD, DDbar, BB, BBbar, D/B in nuclei, have been studied in the framework of the heavy meson effective theory. In addition, we calculated the differential cross section of double charm tetraquark production in e+e- collisions. We demonstrated that the heavy quark degrees of freedom in nuclear medium is interesting in research of gluon dynamics in medium.