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Based on 14.7 fb−1 of e+e− annihilation data collected with the BESIII detector at the BEPCII collider at 17 different center-of-mass energies between 3.7730 GeV and 4.5995 GeV, Born cross sections of the two processes e+e−→pp¯η and e+e−→pp¯ω are measured for the first time. No indication of resonant production through a vector state V is observed, and upper limits on the Born cross sections of e+e−→V→pp¯η and e+e−→V→pp¯ω at the 90% confidence level are calculated for a large parameter space in resonance masses and widths. For the current world average parameters of the ψ(4230) of m=4.2187 GeV/c2 and Γ=44 MeV, we find upper limits on resonant production of the pp¯η and pp¯ω final states of 7.5 pb and 10.4 pb at the 90% CL, respectively.
Based on 4.481×108 ψ(3686) events collected with the BESIII detector at BEPCII, the branching fraction of the isospin violating decay ψ(3686)→Σ¯0Λ+c.c. is measured to be (1.60±0.31±0.13 ± 0.58)×10−6, where the first uncertainty is statistical, the second is systematic, and the third is the uncertainty arising from interference with the continuum. This result is significantly smaller than the measurement based on CLEO-c data sets. The decays χcJ→ΛΛ¯ are measured via ψ(3686)→γχcJ, and the branching fractions are determined to be B(χc0→ΛΛ¯)=(3.64±0.10±0.10±0.07)×10−4, B(χc1→ΛΛ¯)=(1.31±0.06±0.06±0.03)×10−4, B(χc2→ΛΛ¯)=(1.91±0.08±0.17±0.04)×10−4, where the third uncertainties are systematic due to the ψ(3686)→γχcJ branching fractions.
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.
Using an electron-positron collision data sample corresponding to an integrated luminosity of 2.93~fb−1 collected with the BESIII detector at a center-of-mass energy of 3.773 GeV, we search for the baryon and lepton number violating decays D0→p¯e+ and D0→pe−. No obvious signals are found with the current statistics. The upper limits on the branching fractions for D0→p¯e+ and D0→pe− are set to be 1.2×10−6 and 2.2×10−6 at 90\% confidence level, respectively.
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.
We report the first observation of the decay Λ+c→Σ−π+π+π0, based on data obtained in e+e− annihilations with an integrated luminosity of 567~pb−1 at s√=4.6~GeV. The data were collected with the BESIII detector at the BEPCII storage rings. The absolute branching fraction B(Λ+c→Σ−π+π+π0) is determined to be (2.11±0.33(stat.)±0.14(syst.))%. In addition, an improved measurement of B(Λ+c→Σ−π+π+) is determined as (1.81±0.17(stat.)±0.09(syst.))%.
We study the decays of J/ψ and ψ(3686) to the final states Σ(1385)0Σ¯(1385)0 and Ξ0Ξ¯0 based on a single baryon tag method using data samples of (1310.6±7.0)×106 J/ψ and (447.9±2.9)×106 ψ(3686) events collected with the BESIII detector at the BEPCII collider. The decays to Σ(1385)0Σ¯(1385)0 are observed for the first time. The measured branching fractions of J/ψ and ψ(3686)→Ξ0Ξ¯0 are in good agreement with, and much more precise, than the previously published results. The angular parameters for these decays are also measured for the first time. The measured angular decay parameter for J/ψ→Σ(1385)0Σ¯(1385)0, α=−0.64±0.03±0.10, is found to be negative, different to the other decay processes in this measurement. In addition, the "12\% rule" and isospin symmetry in the J/ψ and ψ(3686)→ΞΞ¯ and Σ(1385)Σ¯(1385) systems are tested.
Using data samples collected with the BESIII detector at the BEPCII collider at six center-of-mass energies between 4.008 and 4.600 GeV, we observe the processes e+e− → φφω and e+e− → φφφ. The Born cross sections are measured and the ratio of the cross sections σ(e+e− → φφω)/σ(e+e− → φφφ) is estimated to be 1.75 ± 0.22 ± 0.19 averaged over six energy points, where the first uncertainty is statistical and the second is systematic. The results represent first measurements of these interactions.
Using 16 energy points of e+e− annihilation data collected in the vicinity of the J/ψ resonance with the BESIII detector and with a total integrated luminosity of around 100 pb−1, we study the relative phase between the strong and electromagnetic amplitudes of J/ψ decays. The relative phase between J/ψ electromagnetic decay and the continuum process (e+e− annihilation without the J/ψ resonance) is confirmed to be zero by studying the cross section lineshape of μ+μ− production. The relative phase between J/ψ strong and electromagnetic decays is then measured to be (84.9 ± 3.6)◦ or (−84.7 ± 3.1)◦ for the 2(π+π−)π0 final state by investigating the interference pattern between the J/ψ decay and the continuum process. This is the first measurement of the relative phase between J/ψ strong and electromagnetic decays into a multihadron final state using the lineshape of the production cross section. We also study the production lineshape of the multihadron final state ηπ+π− with η → π+π−π0, which provides additional information about the phase between the J/ψ electromagnetic decay amplitude and the continuum process. Additionally, the branching fraction of J/ψ → 2(π+π−)π0 is measured to be (4.73 ± 0.44)% or (4.85 ± 0.45)%, and the branching fraction of J/ψ → ηπ+π− is measured to be (3.78 ± 0.68) × 10−4. Both of them are consistent with the world average values. The quoted uncertainties include both statistical and systematic uncertainties, which are mainly caused by the low statistics.