New results on charmonium like states at Belle

摘要

New results on charmonium-like states measured by the Belle experiment at the KEKB asymmetric e ~(+) e ~(-)collider are presented, in particular (a) Search for the Z _(c)pair production in $Upsilon (1{m{S}}),,Upsilon (2S)$ decays and in e ~(+) e ~(-) $sqrt s $ of 10.52, 10.58, and 10.867 GeV. (b) Measurement of the absolute branching fractions of ${B^ + } o {X_{coverline c }}{K^ + }$ decays. (c) Observation of Ξ_(c)(2930)~(0)in the updated measurement of ${B^ - } o {K^ - }{Lambda _c}{overline Lambda _{overline c }}.$ (d) Angular analysis of ${e^ + }{e^ - } o {D^{(*) pm }}{D^{* mp }}$ process near the open charm threshold using initial state radiation.