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The radiative hyperon decay Λ→nγ is studied using (10087±44)×106 J/ψ events collected with the BESIII detector operating at BEPCII. The absolute branching fraction of the decay Λ→nγ is determined with a significance of 5.6σ to be [0.832±0.038(stat.)±0.054(syst.)]×10−3, which lies significantly below the current PDG value. By analyzing the joint angular distribution of the decay products, the first determination of the decay asymmetry αγ is reported with a value of −0.16±0.10(stat.)±0.05(syst.).
Using a data sample of (1.0087±0.0044)×1010 J/ψ decay events collected with the BESIII detector at the center-of-mass energy of s√=3.097 GeV, we present a search for the hyperon semileptonic decay Ξ0→Σ−e+νe which violates the ΔS=ΔQ rule. No significant signal is observed, and the upper limit on the branching fraction B(Ξ0→Σ−e+νe) is determined to be 1.6×10−4 at the 90% confidence level. This result improves the previous upper limit result by about one order of magnitude.
he decay D→K−π+ is studied in a sample of quantum-correlated DD¯ pairs, based on a data set corresponding to an integrated luminosity of 2.93\,fb−1 collected at the ψ(3770) resonance by the BESIII experiment. The asymmetry between CP-odd and CP-even eigenstate decays into K−π+ is determined to be AKπ=0.132±0.011±0.007, where the first uncertainty is statistical and the second is systematic. This measurement is an update of an earlier study exploiting additional tagging modes, including several decay modes involving a K0L meson. The branching fractions of the K0L modes are determined as input to the analysis in a manner that is independent of any strong phase uncertainty. Using the predominantly CP-even tag D→π+π−π0 and the ensemble of CP-odd eigenstate tags, the observable Aπππ0Kπ is measured to be 0.130±0.012±0.008. The two asymmetries are sensitive to rKπDcosδKπD, where rKπD and δKπD are the ratio of amplitudes and phase difference, respectively, between the doubly Cabibbo-suppressed and Cabibbo-favoured decays. In addition, events containing D→K−π+ tagged by D→K0S,Lπ+π− are studied in bins of phase space of the three-body decays. This analysis has sensitivity to both rKπDcosδKπD and rKπDsinδKπD. A fit to AKπ, Aπππ0Kπ and the phase-space distribution of the D→K0S,Lπ+π− tags yields δKπD=(187.5+8.9−9.7+5.4−6.4) degrees, where external constraints are applied for rKπD and other relevant parameters. This is the most precise measurement of δKπD in quantum-correlated DD¯ decays.
The decay D→K−π+ is studied in a sample of quantum-correlated DD¯ pairs, based on a data set corresponding to an integrated luminosity of 2.93\,fb−1 collected at the ψ(3770) resonance by the BESIII experiment. The asymmetry between CP-odd and CP-even eigenstate decays into K−π+ is determined to be AKπ=0.132±0.011±0.007, where the first uncertainty is statistical and the second is systematic. This measurement is an update of an earlier study exploiting additional tagging modes, including several decay modes involving a K0L meson. The branching fractions of the K0L modes are determined as input to the analysis in a manner that is independent of any strong phase uncertainty. Using the predominantly CP-even tag D→π+π−π0 and the ensemble of CP-odd eigenstate tags, the observable Aπππ0Kπ is measured to be 0.130±0.012±0.008. The two asymmetries are sensitive to rKπDcosδKπD, where rKπD and δKπD are the ratio of amplitudes and phase difference, respectively, between the doubly Cabibbo-suppressed and Cabibbo-favoured decays. In addition, events containing D→K−π+ tagged by D→K0S,Lπ+π− are studied in bins of phase space of the three-body decays. This analysis has sensitivity to both rKπDcosδKπD and rKπDsinδKπD. A fit to AKπ, Aπππ0Kπ and the phase-space distribution of the D→K0S,Lπ+π− tags yields δKπD=(187.6+8.9−9.7+5.4−6.4) degrees, where external constraints are applied for rKπD and other relevant parameters. This is the most precise measurement of δKπD in quantum-correlated DD¯ decays.
Using data samples with an integrated luminosity of 19 fb−1 at twenty-eight center-of-mass energies from 3.872 GeV to 4.700 GeV collected with the BESIII detector at the BEPCII electron-positron collider, the process e+e− → ηπ+π− and the intermediate process e+e− → ηρ0 are studied for the first time. The Born cross sections are measured. No significant resonance structure is observed in the cross section lineshape.
A measurement of the CP-even fraction of the decay D0→π+π−π+π− is performed with a quantum-correlated ψ(3770)→DD¯ data sample collected by the BESIII experiment, corresponding to an integrated luminosity of 2.93 fb−1. Using a combination of CP eigenstates, D→π+π−π0 and D→K0S,Lπ+π− as tagging modes, the CP-even fraction is measured to be F4π+=0.735±0.015±0.005, where the first uncertainty is statistical and the second is systematic. This is the most precise determination of this quantity to date. It provides valuable model-independent input for the measurement of the CKM angle γ with B±→DK± decays, and for time-dependent studies of CP violation and mixing in the D0-D¯0 system.
Using a sample of (10.09 ± 0.04) × 109 J/ψ decays collected with the BESIII detector, partial wave analyses of the decay J/ψ → γK0SK0Sπ0 are performed within the K0SK0Sπ0 invariant mass region below 1.6 GeV/c2. The covariant tensor amplitude method is used in both mass independent and mass dependent approaches. Both analysis approaches exhibit dominant pseudoscalar and axial vector components, and show good consistency for the other individual components. Furthermore, the mass dependent analysis reveals that the K0SK0 Sπ0 invariant mass spectrum for the pseudoscalar component can be well described with two isoscalar resonant states using relativistic Breit-Wigner model, i.e., the η(1405) with a mass of 1391.7±0.7+11.3 −0.3 MeV/c 2 and a width of 60.8±1.2+5.5 −12.0 MeV, and the η(1475) with a mass of 1507.6±1.6+15.5−32.2 MeV/c2 and a width of 115.8±2.4 +14.8 −10.9 MeV. The first and second uncertainties are statistical and systematic, respectively. Alternate models for the pseudoscalar component are also tested, but the description of the K0SK0Sπ0invariant mass spectrum deteriorates significantly.
Using (447.9 ± 2.3) million ψ(3686) events collected with the BESIII detector, the decays of χcJ→ϕϕ (J=0, 1, 2) have been studied via the decay ψ(3686)→γχcJ. The branching fractions of the decays χcJ→ϕϕ (J=0, 1, 2) are determined to be (8.48±0.26±0.27)×10−4, (4.36±0.13±0.18)×10−4, and (13.36±0.29±0.49)×10−4, respectively, which are the most precise measurements to date. From a helicity amplitude analysis of the process ψ(3686)→γχcJ,χcJ→ϕϕ,ϕ→K+K−, the polarization parameters of the χcJ→ϕϕ decays are determined for the first time.
Measurement of the absolute branching fraction of the singly Cabibbo suppressed decay Λc⁺ → pη′
(2022)
The singly Cabibbo suppressed decay Λ+c→pη′ is measured using 4.5 fb−1 of e+e− collision data collected at center-of-mass energies between 4.600 and 4.699 GeV with the BESIII detector at BEPCII. Evidence for Λ+c→pη′ with a statistical significance of 3.6σ is reported with a double-tag approach. The Λ+c→pη′ absolute branching fraction is determined to be (5.62+2.46−2.04±0.26)×10−4, where the first and second uncertainties are statistical and systematic, respectively. Our result is consistent with the branching fraction obtained by the Belle collaboration within the uncertainty of 1σ.
The decay D→K−π+ is studied in a sample of quantum-correlated DD¯ pairs, based on a data set corresponding to an integrated luminosity of 2.93\,fb−1 collected at the ψ(3770) resonance by the BESIII experiment. The asymmetry between CP-odd and CP-even eigenstate decays into K−π+ is determined to be AKπ=0.132±0.011±0.007, where the first uncertainty is statistical and the second is systematic. This measurement is an update of an earlier study exploiting additional tagging modes, including several decay modes involving a K0L meson. The branching fractions of the K0L modes are determined as input to the analysis in a manner that is independent of any strong phase uncertainty. Using the predominantly CP-even tag D→π+π−π0 and the ensemble of CP-odd eigenstate tags, the observable Aπππ0Kπ is measured to be 0.130±0.012±0.008. The two asymmetries are sensitive to rKπDcosδKπD, where rKπD and δKπD are the ratio of amplitudes and phase difference, respectively, between the doubly Cabibbo-suppressed and Cabibbo-favoured decays. In addition, events containing D→K−π+ tagged by D→K0S,Lπ+π− are studied in bins of phase space of the three-body decays. This analysis has sensitivity to both rKπDcosδKπD and rKπDsinδKπD. A fit to AKπ, Aπππ0Kπ and the phase-space distribution of the D→K0S,Lπ+π− tags yields δKπD=(187.6+8.9−9.7+5.4−6.4) degrees, where external constraints are applied for rKπD and other relevant parameters. This is the most precise measurement of δKπD in quantum-correlated DD¯ decays.