Abstract
We report a study of the processes of and based on 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 . An excess of events over the known contributions of the conventional charmed mesons is observed near the and mass thresholds in the recoil-mass spectrum for events collected at . The structure matches a mass-dependent-width Breit-Wigner line shape, whose pole mass and width are determined as and , respectively. The first uncertainties are statistical and the second are systematic. The significance of the resonance hypothesis is estimated to be over the contributions only from the conventional charmed mesons. This is the first candidate for a charged hidden-charm tetraquark with strangeness, decaying into and . However, the properties of the excess need further exploration with more statistics.
- Received 16 November 2020
- Accepted 5 February 2021
DOI:https://doi.org/10.1103/PhysRevLett.126.102001
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society
Physics Subject Headings (PhySH)
synopsis
New Tetraquark Spotted in Electron-Positron Collisions
Published 11 March 2021
The detection of a new particle containing both charm and strange quarks could offer new insights into how hadrons form.
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