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.
Evidence for a vector charmonium-like state in e+e−→D+sD∗s2(2573)−+c.c.
F. Tenchini;
2020-01-01
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.