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Measurement of the eβΊeβ» β Kβ°SKβ°LΟβ° cross sections from βs = 2.000 to 3.080 GeV
(2024)
Based on e+eβ collision data collected at center-of-mass energies from 2.000 to 3.080 GeV by the BESIII detector at the BEPCII collider, a partial wave analysis isperformed for the process e+eβ β K0SK0LΟ0. The results allow the Born cross sections of the process e+eβ β K0SK0LΟ0, as well as its subprocesses e+eβ β Kβ(892)0KΒ― 0 and Kβ2(1430)0KΒ― 0 to be measured. The Born cross sections for e+eβ β K0SK0 LΟ 0 are consistent with previous measurements by BaBar, but with substantially improved precision. The Born cross section lineshape of the process e+e β β Kβ(892)0KΒ― 0 is consistent with a vector meson state around 2.2 GeV with a signifcance of 3.2Ο. A Breit-Wigner ft determines its mass as MY = (2164.7 Β± 9.1 Β± 3.1) MeV/c2 and its width as ΞY = (32.4 Β± 21.0 Β± 1.8) MeV.
A partial-wave analysis of the decay π½/πβπΎ+β’πΎββ’π0 has been made using (223.7Β±1.4)Γ106ββπ½/π events collected with the BESIII detector in 2009. The analysis, which is performed within the isobar-model approach, reveals contributions from πΎ*2β’(1430)Β±, πΎ*2β’(1980)Β± and πΎ*4β’(2045)Β± decaying to πΎΒ±β’π0. The two latter states are observed in π½/π decays for the first time. Two resonance signals decaying to πΎ+β’πΎβ are also observed. These contributions cannot be reliably identified and their possible interpretations are discussed. The measured branching fraction π΅β‘(π½/πβπΎ+β’πΎββ’π0) of (2.88Β±0.01Β±0.12)Γ10β3 is more precise than previous results. Branching fractions for the reported contributions are presented as well. The results of the partial-wave analysis differ significantly from those previously obtained by BESII and BABAR.
Amplitude analysis and branching-fraction measurement of DββΊβββKββ°Kβ»ΟβΊΟβΊ
(2021)
Using 6.32ββfbβ1 of π+β’πβ collision data collected by the BESIII detector at the center-of-mass energies between 4.178 and 4.226 GeV, an amplitude analysis of the π·+π βπΎ0πβ’πΎββ’π+β’π+ decays is performed for the first time to determine the intermediate-resonant contributions. The dominant component is the π·+π βπΎ*β’(892)+β’Β―πΎ*β’(892)0 decay with a fraction of (40.6Β±2.β’9statΒ±4.β’9sys)%. Our results of the amplitude analysis are used to obtain a more precise measurement of the branching fraction of the π·+π βπΎ0πβ’πΎββ’π+β’π+ decay, which is determined to be (1.46Β±0.0β’5statΒ±0.0β’5sys)%.
Measurement of branching fractions of _Ξ__(c)βΊ decays to Ξ£+K+Kβ, Ξ£+Ο and Ξ£+K+Οβ(Ο0)
(2023)
Based on 4.5 fbβ1 data taken at seven center-of-mass energies ranging from 4.600 to 4.699 GeV with the BESIII detector at the BEPCII collider, we measure the branching fractions of Ξ + c β Ξ£ + + hadrons relative to Ξ + c β Ξ£ +Ο +Ο β. Combining with the world average branching fraction of Ξ + c β Ξ£ +Ο +Ο β, their branching fractions are measured to be (0.377 Β± 0.042 Β± 0.020 Β± 0.021)% for Ξ + c β Ξ£ +K+Kβ, (0.200 Β± 0.023 Β± 0.011 Β± 0.011)% for Ξ + c β Ξ£+K+Οβ, (0.414 Β± 0.080 Β± 0.030 Β± 0.023)% for Ξ + c β Ξ£ +Ο and (0.197 Β± 0.036 Β± 0.009 Β± 0.011)% for Ξ + c β Ξ£ +K+Kβ(non-Ο). In all the above results, the first uncertainties are statistical, the second are systematic and the third are from external input of the branching fraction of Ξ + c β Ξ£ +Ο +Ο β. Since no signal for Ξ + c β Ξ£ +K+ΟβΟ 0 is observed, the upper limit of its branching fraction is determined to be 0.13% at the 90% confidence level.
Using (1310.6Β±7.0)Γ106 π½/π events acquired with the BESIII detector at the BEPCII storage rings, the decay πβ²βπ+β’πββ’π+β’πβ is observed for the first time with a significance of 8β’π via the process π½/πβπΎβ’πβ². We measure the branching fraction of πβ²βπ+β’πββ’π+β’πβ to be β¬β‘(πβ²βπ+β’πββ’π+β’πβ)=(1.97Β±0.33β’(stat)Β±0.19β’(syst))Γ10β5, where the first and second uncertainties are statistical and systematic, respectively
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.
We report an amplitude analysis and branching fraction measurement of π·+
π βπΎ+β’πΎββ’π+ decay using a data sample of 3.19ββfbβ1 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 πΎ+β’πΎβ mass region to determine the πΎ+β’πΎβ S-wave line shape, followed by an amplitude analysis of our very pure high-statistics sample. With the detection efficiency based on the amplitude analysis results, the absolute branching fraction is measured to be β¬β‘(π·+π βπΎ+β’πΎββ’π+)=(5.47Β±0.0β’8statΒ±0.1β’3sys)%.
The rare decay πβ²βπ+β’πββ’π+β’πβ is studied using a sample of 1.3Γ109ββπ½/π events collected with the BESIII detector at BEPCII in 2009 and 2012. The branching fraction is measured with improved precision to be (2.42Β±0.0β’5statΒ±0.0β’8syst)Γ10β3. Due to the inclusion of new data, this result supersedes the last BESIII result on this branching fraction. In addition, the πΆβ’π-violating asymmetry in the angle between the decay planes of the π+β’πβ-pair and the π+β’πβ-pair is investigated. A measurable value would indicate physics beyond the standard model; the result is ππΆβ’π=(2.9Β±3.β’7statΒ±1.β’1syst)%, which is consistent with the standard model expectation of no πΆβ’π-violation. The precision is comparable to the asymmetry measurement in the πΎ0πΏβπ+β’πββ’π+β’πβ decay where the observed (14Β±2)% effect is driven by a standard model mechanism.
We report a study of the processes of π+β’πββπΎ+β’π·βπ β’π·*0 and πΎ+β’π·*βπ β’π·0 based on π+β’πβ 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 3.7ββfbβ1. An excess of events over the known contributions of the conventional charmed mesons is observed near the π·βπ β’π·*0 and π·*βπ β’π·0 mass thresholds in the πΎ+ recoil-mass spectrum for events collected at βπ =4.681ββGeV. The structure matches a mass-dependent-width Breit-Wigner line shape, whose pole mass and width are determined as (3982.5+1.8
β2.6Β±2.1)ββMeV/π2 and (12.8+5.3β4.4Β±3.0)ββMeV, respectively. The first uncertainties are statistical and the second are systematic. The significance of the resonance hypothesis is estimated to be 5.3ββπ over the contributions only from the conventional charmed mesons. This is the first candidate for a charged hidden-charm tetraquark with strangeness, decaying into π·βπ β’π·*0 and π·*βπ β’π·0. However, the properties of the excess need further exploration with more statistics.