Observation of an alternative χc0(2P) candidate in e+e- → J/ψDD

Le résumé fourni par la source

We perform a full amplitude analysis of the process e þ e -→ J=ψD D, where D refers to either D 0 or D þ .A new charmoniumlike state X Ã ð3860Þ that decays to D D is observed with a significance of 6.5σ.Its mass is ð3862 þ26 -32 þ40 -13 Þ MeV=c 2 , and its width is ð201 þ154-67 þ88-82 Þ MeV.The J PC ¼ 0 þþ hypothesis is favored over the 2 þþ hypothesis at the level of 2.5σ.The analysis is based on the 980 fb -1 data sample collected by the Belle detector at the asymmetric-energy e þ e -collider KEKB.

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