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Observation of an alternative $$chi_{c0}(2P)$$ candidate in $$e^+e^- to J/psi Dbar{D}$$

$$e^+e^- to J/psi Dbar{D}$$における$$chi_{c0}(2P)$$の別候補の観測

Chilikin, K.*; 谷田 聖   ; Belle Collaboration*; 他167名*

Chilikin, K.*; Tanida, Kiyoshi; Belle Collaboration*; 167 of others*

We perform a full amplitude analysis of the process $$e^+e^- to J/psi Dbar{D}$$, where $$D$$ refers to either $$D^+$$ or $$D^0$$. A new charmonium-like state $$X^*(3860)$$ that decays to $$Dbar{D}$$ is observed with a significance of $$6.5sigma$$. Its mass is $$(3862^{+26}_{-32}{}^{+40}_{-13})$$ MeV/$$c^2$$ and width is $$(201^{+154}_{-67}{}^{+88}_{-82})$$ MeV. The $$J^{PC}=0^{++}$$ hypothesis is favored over the $$2^{++}$$ hypothesis at the level of $$2.5sigma$$. The analysis is based on the 980 fb$$^{-1}$$ data sample collected by the Belle detector at the asymmetric-energy $$e^+e^-$$ collider KEKB.

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パーセンタイル:89.9

分野:Astronomy & Astrophysics

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