Evidence for a vector charmonium-like state in e+e−→D+sD∗s2(2573)−+c.c.

Jia, S and Shen, C P and Giri, Anjan Kumar and et al, . (2020) Evidence for a vector charmonium-like state in e+e−→D+sD∗s2(2573)−+c.c. arxiv.org.

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Abstract

We report the measurement of e+e−→D+sD∗s2(2573)−+c.c. via initial-state radiation using a data sample of an integrated luminosity of 921.9 fb−1 collected with the Belle detector at the Υ(4S) and nearby. We find evidence for an enhancement with a 3.4σ significance in the invariant mass of D+sD∗s2(2573)−+c.c. The measured mass and width are (4619.8+8.9−8.0(stat.)±2.3(syst.)) MeV/c2 and (47.0+31.3−14.8(stat.)±4.6(syst.)) MeV, respectively. The mass, width, and quantum numbers of this enhancement are consistent with the charmonium-like state at 4626 MeV/c2 recently reported by Belle in e+e−→D+sDs1(2536)−+c.c. The product of the e+e−→D+sD∗s2(2573)−+c.c. cross section and the branching fraction of D∗s2(2573)−→D¯0K− is measured from D+sD∗s2(2573)− threshold to 5.6 GeV.

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