Observation of a Near-Threshold Structure in the K+ Recoil-Mass Spectra in e + - → K+ (D-s D0 + D-s D0)

We report a study of the processes of ... 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 t...

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Bibliographic Details
Published in:Physical review letters 2021-03, Vol.126 (10)
Main Author: Ablikim, M
Format: Article
Language:English
Subjects:
Charm (particle physics)
Line shape
Luminosity
Mass spectra
Mesons
Recoil
Statistical methods
Strangeness
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Summary:We report a study of the processes of ... 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 ... mass thresholds in the K+ recoil-mass spectrum for events collected ... The structure matches a mass-dependent-width Breit-Wigner line shape, whose pole mass and width are determined as ... , 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 ... . However, the properties of the excess need further exploration with more statistics. (ProQuest: ... denotes formulae omitted.)
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.126.102001