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During the 2016-17 and 2018-19 running periods, the BESIII experiment collected 7.5~fbβ1 of e+eβ collision data at center-of-mass energies ranging from 4.13 to 4.44 GeV. These data samples are primarily used for the study of excited charmonium and charmoniumlike states. By analyzing the di-muon process e+eββ(Ξ³ISR/FSR)ΞΌ+ΞΌβ, we measure the center-of-mass energies of the data samples with a precision of 0.6 MeV. Through a run-by-run study, we find that the center-of-mass energies were stable throughout most of the data-taking period.
There has recently been a dramatic renewal of interest in hadron spectroscopy and charm physics. This renaissance has been driven in part by the discovery of a plethora of charmonium-like XYZ states at BESIII and B factories, and the observation of an intriguing proton-antiproton threshold enhancement and the possibly related X(1835) meson state at BESIII, as well as the threshold measurements of charm mesons and charm baryons.
We present a detailed survey of the important topics in tau-charm physics and hadron physics that can be further explored at BESIII during the remaining operation period of BEPCII. This survey will help in the optimization of the data-taking plan over the coming years, and provides physics motivation for the possible upgrade of BEPCII to higher luminosity.
Amplitude analysis and branching fraction measurement of the decay DββΊ β ΟβΊΟβ°Οβ°
(2022)
Using a data set corresponding to an integrated luminosity of 6.32 fbβ1 recorded by the BESIII detector at center-of-mass energies between 4.178 and 4.226 GeV, an amplitude analysis of the decay D+s β Ο+Ο0Ο0 is performed, and the relative fractions and phases of different intermediate processes are determined. The absolute branching fraction of the decay D+s β Ο+Ο0Ο0 is measured to be (0.50 Β± 0.04stat Β± 0.02syst)%. Theabsolute branching fraction of the intermediate process D+s β f0(980)Ο+, f0(980) β Ο0Ο0 is determined to be (0.28 Β± 0.04stat Β± 0.04syst)%.
We report a study of the processes of e+eββK+(DβsDβ0+DββsD0) based on e+eβ 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 fbβ1. An excess over the known contributions of the conventional charmed mesons is observed near the DβsDβ0 and DββsD0 mass thresholds in the K+ recoil-mass spectrum for events collected at sβ=4.681 GeV. The structure matches a mass-dependent-width Breit-Wigner line shape, whose pole mass and width are determined as (3982.5+1.8β2.6Β±2.1) MeV/c2 and (12.8+5.3β4.4Β±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 Ο over the pure contributions from the conventional charmed mesons. This is the first candidate of the charged hidden-charm tetraquark with strangeness, decaying into DβsDβ0 and DββsD0. However, the genuine properties of the excess need further exploration with more statistics.
Using an π+β’πβ collision data sample of 2.93ββfbβ1 collected at a center-of-mass energy of 3.773 GeV by the BESIII detector at BEPCII, we report the observation of π·0βπ0β’(980)ββ’π+β’ππ and evidence for π·+βπ0β’(980)0β’π+β’ππ with significances of 6.4β’π and 2.9β’π, respectively. The absolute branching fractions are determined to be β¬β‘(π·0βπ0β’(980)ββ’π+β’ππ)Γβ¬β‘(π0β’(980)ββπβ’πβ) = [1.3β’3+0.33β0.29β’(stat)Β±0.09β’(syst)]Γ10β4 and β¬β‘(π·+βπ0β’(980)0β’π+β’ππ)Γβ¬β‘(π0β’(980)0βπβ’π0)=[1.6β’6+0.81
β0.66β’(stat)Β±0.11β’(syst)]Γ10β4. This is the first time the π0β‘(980) meson has been measured in a π·0 semileptonic decay, which would open one more interesting page in the investigation of the nature of the puzzling π0β‘(980) states.
Using inclusive decays of the J/Ο, a precise determination of the number of J/Ο events collected with the BESIII detector is performed. For the two data sets taken in 2009 and 2012, the numbers of J/Ο events are recalculated to be (224.0Β±1.3)Γ106 and (1088.5Β±4.4)Γ106 respectively, which are in good agreement with the previous measurements. For the J/Ο sample taken in 2017--2019, the number of events is determined to be (8774.0Β±39.4)Γ106. The total number of J/Ο events collected with the BESIII detector is determined to be (10087Β±44)Γ106, where the uncertainty is dominated by systematic effects and the statistical uncertainty is negligible.
The processes π+β’πββπ·+ π β’π·π β’1β’(2460)β+c.c. and π+β’πββπ·*+ π β’π·π β’1β’(2460)β+c.c. are studied for the first time using data samples collected with the BESIII detector at the BEPCII collider. The Born cross sections of π+β’πββπ·+ π β’π·π β’1β’(2460)β+c.c. at nine center-of-mass energies between 4.467 GeV and 4.600 GeV and those of π+β’πββπ·*+ π β’π·π β’1β’(2460)β+c.c. at βπ =4.590ββGeV and 4.600 GeV are measured. No obvious charmonium or charmoniumlike structure is seen in the measured cross sections.
We report an amplitude analysis and branching fraction measurement of D+sβK+KβΟ+ decay using a data sample of 3.19 fbβ1 recorded with BESIII detector at a center-of-mass energy of 4.178 GeV.
We perform a model-independent partial wave analysis in the low K+Kβ mass region to determine the K+Kβ S-wave lineshape, followed by an amplitude analysis of our very pure high-statistics sample.
The amplitude analysis provides an accurate determination of the detection efficiency allowing us to measure the branching fraction B(D+sβK+KβΟ+)=(5.47Β±0.08statΒ±0.13sys)%.
Using data collected with the BESIII detector operating at the Beijing Electron Positron Collider, we search for the process π+β’πββππβ’πβ’π+β’πβ. The search is performed using five large datasets recorded at center-of-mass energies of 4.23, 4.26, 4.36, 4.42, and 4.60 GeV. The ππ meson is reconstructed in 16 exclusive decay modes. No signal is observed in the ππ mass region at any center-of-mass energy. The upper limits on the reaction cross sections are determined to be 6.2, 10.8, 27.6, 22.6 and 23.7 pb at the 90% confidence level at the center-of-mass energies listed above.
We report new measurements of the branching fraction β¬β‘(π·+π ββ+β’π), where β+ is either π+ or π+β‘(βπ+β’Β―ππ), based on 6.32ββfbβ1 of electron-positron annihilation data collected by the BESIII experiment at six center-of-mass energy points between 4.178 and 4.226 GeV. Simultaneously floating the π·+π βπ+β’ππ and π·+π βπ+β’ππ components yields β¬β‘(π·+π βπ+β’ππ)=(5.21Β±0.25Β±0.17)Γ10β2, β¬β‘(π·+π βπ+β’ππ)=(5.35Β±0.13Β±0.16)Γ10β3, and the ratio of decay widths π
=Ξβ‘(π·+π βπ+β’ππ)Ξβ‘(π·+π βπ+β’ππ)=9.7β’3+0.61β0.58Β±0.36, where the first uncertainties are statistical and the second systematic. No evidence of πΆβ’π asymmetry is observed in the decay rates π·Β±π βπΒ±β’ππ and π·Β±π βπΒ±β’ππ: π΄πΆβ’πβ‘(πΒ±β’π)=(β1.2Β±2.5Β±1.0)% and π΄πΆβ’πβ‘(πΒ±β’π)=(+2.9Β±4.8Β±1.0)%. Constraining our measurement to the Standard Model expectation of lepton universality (π
=9.75), we find the more precise results β¬β‘(π·+π βπ+β’ππ)=(5.22Β±0.10Β±0.14)Γ10β2 and π΄πΆβ’πβ‘(πΒ±β’ππ)=(β0.1Β±1.9Β±1.0)%. Combining our results with inputs external to our analysis, we determine the πβΒ―π quark mixing matrix element, π·+π decay constant, and ratio of the decay constants to be |ππβ’π |=0.973Β±0.009Β±0.014, ππ·+π =249.9Β±2.4Β±3.5ββMeV, and ππ·+π /ππ·+=1.232Β±0.035, respectively.