TY - JOUR
T1 - Observation of a Near-Threshold Structure in the K+ Recoil-Mass Spectra in e+e−→K+(D−sD*0+D*−sD0)
AU - BESIII Collaboration
AU - Ablikim, M.
AU - Achasov, M.N.
AU - Adlarson, P.
AU - Ahmed, S.
AU - Albrecht, M.
AU - Aliberti, R.
AU - Amoroso, A.
AU - Kalantar-Nayestanaki, Nasser
AU - Kappert, Rosa
AU - Kavatsyuk, Myroslav
AU - Messchendorp, Johan
AU - Rodin, Viktor
PY - 2021
Y1 - 2021
N2 - We report a study of the processes of e+e−→K+D−sD*0 and K+D*−sD0 based on e+e− annihilation samples collected with the BESIII detector operating at BEPCII at five center-of-mass energies ranging from 4.628 to 4.698 GeV with a total integrated luminosity of 3.7 fb−1. An excess of events over the known contributions of the conventional charmed mesons is observed near the D−sD*0 and D*−sD0 mass thresholds in the K+ recoil-mass spectrum for events collected at √s=4.681 GeV. The structure matches a mass-dependent-width Breit-Wigner line shape, whose pole mass and width are determined as (3982.5+1.8−2.6±2.1) MeV/c2 and (12.8+5.3−4.4±3.0) MeV, respectively. The first uncertainties are statistical and the second are systematic. The significance of the resonance hypothesis is estimated to be 5.3 σ over the contributions only from the conventional charmed mesons. This is the first candidate for a charged hidden-charm tetraquark with strangeness, decaying into D−sD*0 and D*−sD0. However, the properties of the excess need further exploration with more statistics
AB - We report a study of the processes of e+e−→K+D−sD*0 and K+D*−sD0 based on e+e− annihilation samples collected with the BESIII detector operating at BEPCII at five center-of-mass energies ranging from 4.628 to 4.698 GeV with a total integrated luminosity of 3.7 fb−1. An excess of events over the known contributions of the conventional charmed mesons is observed near the D−sD*0 and D*−sD0 mass thresholds in the K+ recoil-mass spectrum for events collected at √s=4.681 GeV. The structure matches a mass-dependent-width Breit-Wigner line shape, whose pole mass and width are determined as (3982.5+1.8−2.6±2.1) MeV/c2 and (12.8+5.3−4.4±3.0) MeV, respectively. The first uncertainties are statistical and the second are systematic. The significance of the resonance hypothesis is estimated to be 5.3 σ over the contributions only from the conventional charmed mesons. This is the first candidate for a charged hidden-charm tetraquark with strangeness, decaying into D−sD*0 and D*−sD0. However, the properties of the excess need further exploration with more statistics
U2 - 10.1103/PhysRevLett.126.102001
DO - 10.1103/PhysRevLett.126.102001
M3 - Article
SN - 0031-9007
VL - 126
JO - Physical Review Letters
JF - Physical Review Letters
M1 - 102001
ER -