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Chilikin, K.; Adachi, I.; Aihara, H.; Kuhr, T.; Ritter, M.; Salehi, M. (2017): Observation of an alternative chi(c0)(2P) candidate in e(+)e(-)-> J/psi D(D)over-bar. In: Physical Review D, Vol. 95, Nr. 11, 112003
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Abstract

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