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Institute
Based on a sample of (10.09±0.04)×109 J/ψ events collected with the BESIII detector operating at the BEPCII storage ring, a partial wave analysis of the decay J/ψ→γηη′ is performed. An isoscalar state with exotic quantum numbers JPC=1−+, denoted as η1(1855), has been observed for the first time with statistical significance larger than 19σ. Its mass and width are measured to be (1855±9+6−1)~MeV/c2 and (188±18+3−8)~MeV, respectively. The product branching fraction B(J/ψ→γη1(1855)→γηη′) is measured to be (2.70±0.41+0.16−0.35)×10−6. The first uncertainties are statistical and the second are systematic. In addition, an upper limit on the branching ratio B(f0(1710)→ηη′)/B(f0(1710)→ππ) is determined to be 1.61×10−3 at 90\% confidence level, which lends support to the hypothesis that the f0(1710) has a large glueball component.
Relative fractions and phases of the intermediate decays are determined. With the detection efficiency estimated by the results of the amplitude analysis, the branching fraction of Dþ s → K−Kþπþπ0 decay is measured to be ð5.42 0.10stat 0.17systÞ%.
By analyzing an e+e− annihilation data sample with an integrated luminosity of 2.93 fb−1 taken at the center-of-mass energy of 3.773 GeV with the BESIII detector, we determine the absolute branching fractions of the hadronic decays D0→K−π+ω, D0→K0Sπ0ω, and D+→K0Sπ+ω to be (3.392±0.044stat±0.085syst)%, (0.848±0.046stat±0.031syst)%, and (0.707±0.041stat±0.029syst)%, respectively. The accuracy of the branching fraction measurement of the decay D0→K−π+ω is improved by a factor of seven compared to the world average value. The D0→K0Sπ0ω and D+→K0Sπ+ω decays are observed for the first time.
Study of the decay Dₛ⁺ → π⁺π⁺π⁻η and observation of the W-annihilation decay Dₛ⁺ → a₀(980)⁺ρ⁰
(2021)
The decay 𝐷+𝑠→𝜋+𝜋+𝜋−𝜂 is observed for the first time, using 𝑒+𝑒− collision data corresponding to an integrated luminosity of 6.32 fb−1, collected by the BESIII detector at center-of-mass energies between 4.178 and 4.226 GeV. The absolute branching fraction for this decay is measured to be ℬ(𝐷+𝑠→𝜋+𝜋+𝜋−𝜂)=(3.12±0.13stat±0.09syst)%. The first amplitude analysis of this decay reveals the substructures in 𝐷+𝑠→𝜋+𝜋+𝜋−𝜂 and determines the relative fractions and the phases among these substructures. The dominant intermediate process is 𝐷+𝑠→𝑎1(1260)+𝜂,𝑎1(1260)+→𝜌(770)0𝜋+ with a branching fraction of (1.73±0.14stat±0.08syst)%. We also observe the 𝑊-annihilation process 𝐷+𝑠→𝑎0(980)+𝜌(770)0, 𝑎0(980)+→𝜋+𝜂 with a branching fraction of (0.21±0.08stat±0.05syst)%, which is larger than the branching fractions of other measured pure 𝑊-annihilation decays by 1 order of magnitude.
The singly Cabibbo-suppressed decay Λ+c→nπ+ is observed for the first time with a statistical significance of 7.3σ by using 3.9 fb−1 of e+e− collision data collected at center-of-mass energies between 4.612 and 4.699 GeV with the BESIII detector at BEPCII. The branching fraction of Λ+c→nπ+ is measured to be (6.6±1.2stat±0.4syst)×10−4. By taking the upper limit of branching fractions of Λ+c→pπ0 from the Belle experiment, the ratio of branching fractions between Λ+c→nπ+ and Λ+c→pπ0 is calculated to be larger than 7.2 at the 90% confidence level, which disagrees with the current predictions of available phenomenological models. In addition, the branching fractions of the Cabibbo-favored decays Λ+c→Λπ+ and Λ+c→Σ0π+ are measured to be (1.31±0.08stat±0.05syst)×10−2 and (1.22±0.08stat±0.07syst)×10−2, respectively, which are consistent with previous results.
The singly Cabibbo-suppressed decay Λ+c→nπ+ is observed for the first time with a statistical significance of 7.3σ by using 3.9 fb−1 of e+e− collision data collected at center-of-mass energies between 4.612 and 4.699 GeV with the BESIII detector at BEPCII. The branching fraction of Λ+c→nπ+ is measured to be (6.6±1.2stat±0.4syst)×10−4. By taking the upper limit of branching fractions of Λ+c→pπ0 from the Belle experiment, the ratio of branching fractions between Λ+c→nπ+ and Λ+c→pπ0 is calculated to be larger than 7.2 at the 90% confidence level, which disagrees with the current predictions of available phenomenological models. In addition, the branching fractions of the Cabibbo-favored decays Λ+c→Λπ+ and Λ+c→Σ0π+ are measured to be (1.31±0.08stat±0.05syst)×10−2 and (1.22±0.08stat±0.07syst)×10−2, respectively, which are consistent with previous results.
The singly Cabibbo-suppressed decay Λ+c→nπ+ is observed for the first time with a statistical significance of 7.3σ by using 3.9 fb−1 of e+e− collision data collected at center-of-mass energies between 4.612 and 4.699 GeV with the BESIII detector at BEPCII. The branching fraction of Λ+c→nπ+ is measured to be (6.6±1.2stat±0.4syst)×10−4. By taking the upper limit of branching fractions of Λ+c→pπ0 from the Belle experiment, the ratio of branching fractions between Λ+c→nπ+ and Λ+c→pπ0 is calculated to be larger than 7.2 at the 90% confidence level, which disagrees with the current predictions of available phenomenological models. In addition, the branching fractions of the Cabibbo-favored decays Λ+c→Λπ+ and Λ+c→Σ0π+ are measured to be (1.31±0.08stat±0.05syst)×10−2 and (1.22±0.08stat±0.07syst)×10−2, respectively, which are consistent with previous results.
Using a dataset of 6.32 fb−1 of 𝑒+𝑒− annihilation data collected with the BESIII detector at center-of-mass energies between 4178 and 4226 MeV, we have measured the absolute branching fraction of the leptonic decay 𝐷+𝑠→𝜏+𝜈𝜏 via 𝜏+→𝑒+𝜈𝑒¯𝜈𝜏, and find ℬ𝐷+𝑠→𝜏+𝜈𝜏=(5.27±0.10±0.12)×10−2, where the first uncertainty is statistical and the second is systematic. The precision is improved by a factor of 2 compared to the previous best measurement. Combining with 𝑓𝐷+𝑠 from lattice quantum chromodynamics calculations or the |𝑉𝑐𝑠| from the CKMfitter group, we extract |𝑉𝑐𝑠|=0.978±0.009±0.012 and 𝑓𝐷+𝑠=(251.1±2.4±3.0) MeV, respectively. Combining our result with the world averages of ℬ𝐷+𝑠→𝜏+𝜈𝜏 and ℬ𝐷+𝑠→𝜇+𝜈𝜇, we obtain the ratio of the branching fractions ℬ𝐷+𝑠→𝜏+𝜈𝜏/ℬ𝐷+𝑠→𝜇+𝜈𝜇=9.72±0.37, which is consistent with the standard model prediction of lepton flavor universality.
We report on a comparison of two possible Λ+c spin hypotheses, J=12 and 32, via the process e+e−→Λ+cΛ¯−c, using the angular distributions of Λ+c decays into pK0S, Λπ+, Σ0π+, and Σ+π0. The data were recorded at s√=4.6 GeV with the BESIII detector and correspond to an integrated luminosity of 587 pb−1. The Λ+c spin is determined to be J=12, with this value favored over the 32 hypothesis with a significance corresponding to more than 6 Gaussian standard deviations.