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Using (2712.4 ± 14.3)×106 ψ(3686) events collected with the BESIII detector at BEPCII, a partial wave analysis of the decay ψ(3686)→ϕηη′ is performed with the covariant tensor approach. An axial-vector state with a mass near 2.3 GeV/c2 is observed for the first time. Its mass and width are measured to be 2316 ±9stat±30systMeV/c2 and 89 ±15stat±26systMeV, respectively. The product branching fractions of B(ψ(3686)→X(2300)η′)B(X(2300)→ϕη) and B(ψ(3686)→X(2300)η)B(X(2300)→ϕη′) are determined to be (4.8 ±1.3stat±0.7syst)×10−6 and (2.2 ±0.7stat±0.7syst)×10−6, respectively. The branching fraction B(ψ(3686)→ϕηη′) is measured for the first time to be (3.14±0.17stat±0.24syst)×10−5.
The first uncertainties are statistical and the second are systematic.
Using data samples collected with the BESIII detector at the BEPCII collider at center-of-mass energies ranging from 3.80 to 4.95 GeV, corresponding to an integrated luminosity of 20 fb−1, a measurement of Born cross sections for the e+e−→D0D¯0 and D+D− processes is presented with unprecedented precision. Many clear peaks in the line shape of e+e−→D0D¯0 and D+D− around the mass range of G(3900), ψ(4040), ψ(4160), Y(4260), and ψ(4415), etc., are foreseen. These results offer crucial experimental insights into the nature of hadron production in the open-charm region.
Based on a data sample of (27.08±0.14)×108 ψ(3686) events collected with the BESIII detector at the BEPCII collider, the M1 transition ψ(3686)→γηc(2S) with ηc(2S)→KK¯π is studied, where KK¯π is K+K−π0 or K0SK±π∓. The mass and width of the ηc(2S) are measured to be (3637.8±0.8(stat)±0.2(syst)) MeV/c2 and (10.5±1.7(stat)±3.5(syst)) MeV, respectively. The product branching fraction B(ψ(3686)→γηc(2S))×B(ηc(2S)→KK¯π) is determined to be (0.97±0.06(stat)±0.09(syst))×10−5. Using BR(ηc(2S)→KK¯π)=(1.86+0.68−0.49)%, we obtain the branching fraction of the radiative transition to be BR(ψ(3686)→γηc(2S))=(5.2±0.3(stat)±0.5(syst)+1.9−1.4(extr))×10−4, where the third uncertainty is due to the quoted BR(ηc(2S)→KK¯π).
The J/ψ→Ξ0Ξ¯0 process and subsequent decays are investigated using (10087±44)×106 J/ψ events collected at the BESIII experiment. The decay parameters of Ξ0 and Ξ¯0 are measured with greatly improved precision over previous measurements to be αΞ=−0.3750±0.0034±0.0016, α¯Ξ=0.3790±0.0034±0.0021, ϕΞ=0.0051±0.0096±0.0018~rad, ϕ¯Ξ=−0.0053±0.0097±0.0019~rad, where the first and the second uncertainties are statistical and systematic, respectively. From these measurements, precise CP symmetry tests in Ξ0 decay are performed, and AΞCP=(−5.4±6.5±3.1)×10−3 and ΔϕΞCP=(−0.1±6.9±0.9)×10−3~rad are consistent with CP conservation. The sequential decay also enables a separation of weak and strong phase differences, which are found for the first time to be ξP−ξS=(0.0±1.7±0.2)×10−2~rad and δP−δS=(−1.3±1.7±0.4)×10−2~rad, respectively. In addition, we measure the Λ decay parameters and test CP symmetry in Λ decays.
We perform for the first time an amplitude analysis of the decay D+→K0Sπ+η and report the observation of the decay D+→K0Sa0(980)+ using 2.93 fb−1 of e+e− collision data taken at a center-of-mass energy of 3.773 GeV with the BESIII detector. As the only W-annihilation free decay among D to a0(980)-pseudoscalar, D+→K0Sa0(980)+ is the ideal decay to extract the contributions of the external and internal W-emission amplitudes involving a0(980) and study the final-state interactions. The absolute branching fraction of D+→K0Sπ+η is measured to be (1.27±0.04stat.±0.03syst.)%. The product branching fractions of D+→K0Sa0(980)+ with a0(980)+→π+η and D+→π+K∗0(1430)0 with K∗0(1430)0→K0Sη are measured to be (1.33±0.05stat.±0.04syst.)% and (0.14±0.03stat.±0.01syst.)%, respectively.
The Born cross sections and effective form factors of the process 𝑒+𝑒−→Λ¯Σ0+c.c. are measured at 14 center-of-mass energy points from 2.3094 to 3.0800 GeV, based on data corresponding to an integrated luminosity of (478.5±4.8) pb−1 collected with the BESIII detector. A nonzero Born cross section is observed at the center-of-mass energy of 2.3094 GeV with a statistical significance of more than five standard deviations, and the cross sections at other energies are obtained with improved precision compared to earlier measurements from the BABAR Collaboration. The Born cross-section line shape is described better by a shape considering the strong-interaction effects than by a pQCD motivated functional form.
Based on (2712.4±14.3)×106 events recorded at the 𝜓(3686) nominal mass collected with the BESIII detector operating at the BEPCII collider, the 𝜓(3686)→Σ+¯Σ−𝜔 and Σ+¯Σ−𝜙 decays are observed for the first time with statistical significances of 13.8𝜎 and 7.6𝜎, respectively. The corresponding branching fractions are measured to be ℬ(𝜓(3686)→Σ+¯Σ−𝜔)=(1.89±0.18±0.21)×10−5 and ℬ(𝜓(3686)→Σ+¯Σ−𝜙)=(2.96±0.54±0.41)×10−6, where the first uncertainties are statistical and the second systematic.
The Born cross sections and effective form factors of the process e+e−→ΛΣ¯0+c.c. are measured at 14 center-of-mass energy points from 2.3094 to 3.0800 GeV, based on data corresponding to an integrated luminosity of (478.5±4.8) pb−1 collected with the BESIII detector. A non-zero Born cross section is observed at the center-of-mass energy of 2.3094 GeV with a statistical significance of more than five standard deviations, and the cross sections at other energies are obtained with improved precision compared to earlier measurements from the BaBar Collaboration. The Born cross-section lineshape is described better by a shape with a plateau near the threshold than by a pQCD motivated functional form.
The first observation of the decays J/ψ→p¯Σ+K0S and J/ψ→pΣ¯−K0S is reported using (10087±44)×106 J/ψ events recorded by the BESIII detector at the BEPCII storage ring. The branching fractions of each channel are determined to be B(J/ψ→p¯Σ+K0S)=(1.361±0.006±0.025)×10−4 and B(J/ψ→pΣ¯−K0S)=(1.352±0.006±0.025)×10−4. The combined result is B(J/ψ→p¯Σ+K0S+c.c.)=(2.725±0.009±0.050)×10−4, where the first uncertainty is statistical and the second systematic. The results presented are in good agreement with the branching fractions of the isospin partner decay J/ψ→pK−Σ¯0+c.c..
Using a sample of (27.12±0.14)×108 ψ(3686) events collected with the BESIII detector, the decay ψ(3686)→ΛΛ¯η′ with η′ subsequently decaying into γπ+π− and ηπ+π− is observed for the first time. The branching fraction of ψ(3686)→ΛΛ¯η′ is measured to be (7.34±0.94(stat.)±0.43(sys.))×10−6. No resonant structures are evident in the Λη′, Λ¯η′ and ΛΛ¯ mass spectra.