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By analyzing e+e− annihilation data corresponding to an integrated luminosity of 7.93 fb−1, collected at the center-of-mass energy of 3.773 GeV with the BESIII detector, we search for the semileptonic decays D0→K−ηe+νe, D+→K0Sηe+νe and D+→ηηe+νe for the first time. We present evidence for D0→K−ηe+νe with a significance of 3.3σ. The branching fraction of D0→K−ηe+νe is measured to be (0.84+0.29−0.34±0.22)×10−4. %Alternatively, under the assumption that this decay is dominated by non-resonant, the branching fraction is determined to be (1.12+0.45−0.38±0.05)×10−4. Here, the first uncertainties are statistical and the second ones are systematic. No significant signals are observed for the decays D+→K0Sηe+νe and D+→ηηe+νe and we set the upper limits on their branching fractions.
By analyzing e+e− annihilation data corresponding to an integrated luminosity of 7.93 fb−1, collected at the center-of-mass energy of 3.773 GeV with the BESIII detector, we search for the semileptonic decays D0→K−ηe+νe, D+→K0Sηe+νe and D+→ηηe+νe for the first time. We present evidence for D0→K−ηe+νe with a significance of 3.3σ. The branching fraction of D0→K−ηe+νe is measured to be (0.84+0.29−0.34±0.22)×10−4. Here, the first uncertainties are statistical and the second ones are systematic. No significant signals are observed for the decays D+→K0Sηe+νe and D+→ηηe+νe and we set the upper limits on their branching fractions.
Observation of ψ(3686) → 3ϕ
(2024)
Using (2.712±0.014)×109 ψ(3686) events collected by the BESIII detector operating at the BEPCII collider, we report the first observation of ψ(3686)→3ϕ decay with a significance larger than 10σ. The branching fraction of this decay is determined to be (1.46±0.05±0.17)×10−5, where the first uncertainty is statistical and the second is systematic. No significant structure is observed in the ϕϕ invariant mass spectra.
Based on (2.712±0.014)×109 ψ(3686) events collected by the BESIII collaboration, evidence of the hadronic decay hc→K0SK+π−+c.c. is found with a significance of 4.3σ in the ψ(3686)→π0hc process. The branching fraction of hc→K0SK+π−+c.c. is measured to be (7.3±0.8±1.8)×10−4, where the first and second uncertainties are statistical and systematic, respectively. Combining with the exclusive decay width of ηc→KK¯π, our result indicates inconsistencies with both pQCD and NRQCD predictions.
In this Letter, a systematic study of the weak radiative hyperon decay Ξ0→Λγ at an electron-positron collider using entangled Ξ0Ξ¯0 pair events is presented. The absolute branching fraction for this decay has been measured for the first time, and is (1.347±0.066stat.±0.054syst.)×10−3. The decay asymmetry parameter, which characterizes the effect of parity violation in the decay, is determined to be −0.741±0.062stat.±0.019syst.. The obtained results are consistent with the world average values within the uncertainties, offering valuable insights into the underlying mechanism governing the weak radiative hyperon decays. The charge conjugation parity (CP) symmetries of branching fraction and decay asymmetry parameter in the decay are also studied. No statistically significant violation of charge conjugation parity symmetry is observed.
In this Letter, a systematic study of the weak radiative hyperon decay Ξ0→Λγ at an electron-positron collider using entangled Ξ0Ξ¯0 pair events is presented. The absolute branching fraction for this decay has been measured for the first time, and is (1.347±0.066stat.±0.054syst.)×10−3. The decay asymmetry parameter, which characterizes the effect of parity violation in the decay, is determined to be −0.741±0.062stat.±0.019syst.. The obtained results are consistent with the world average values within the uncertainties, offering valuable insights into the underlying mechanism governing the weak radiative hyperon decays. The charge conjugation parity (CP) symmetries of branching fraction and decay asymmetry parameter in the decay are also studied. No statistically significant violation of charge conjugation parity symmetry is observed.
The J/ψ,ψ(3686)→Σ0Σ¯0 processes and subsequent decays are studied using the world's largest J/ψ and ψ(3686) data samples collected with the BESIII detector. The strong-CP symmetry is tested in the decays of the Σ0 hyperons for the first time by measuring the decay parameters, αΣ0=−0.0017±0.0021±0.0018 and α¯Σ0=0.0021±0.0020±0.0022. The weak-CP test is performed in the subsequent decays of their daughter particles Λ and Λ¯. Also for the first time, the transverse polarizations of the Σ0 hyperons in J/ψ and ψ(3686) decays are observed with opposite directions, and the ratios between the S-wave and D-wave contributions of the J/ψ,ψ(3686)→Σ0Σ¯0 decays are obtained. These results are crucial to understand the decay dynamics of the charmonium states and the production mechanism of the Σ0−Σ¯0 pairs.
Based on (2712.4±14.3)×106 ψ(3686) events, we investigate four hadronic decay modes of the P-wave charmonium spin-singlet state hc(1P1)→h+h−π0/η (h=π or K) via the process ψ(3686)→π0hc at BESIII. The hc→π+π−π0 decay is observed with a significance of 9.6σ after taking into account systematic uncertainties. Evidences for hc→K+K−π0 and hc→K+K−η are found with significances of 3.5σ and 3.3σ, respectively, after considering the systematic uncertainties. The branching fractions of these decays are measured to be B(hc→π+π−π0)=(1.36±0.16±0.14)×10−3, B(hc→K+K−π0)=(3.26±0.84±0.36)×10−4, and B(hc→K+K−η)=(3.13±1.08±0.38)×10−4, where the first uncertainties are statistical and the second are systematic. No significant signal of hc→π+π−η is found, and the upper limit of its decay branching fraction is determined to be B(hc→π+π−η)<4.0×10−4 at 90% confidence level.
The processes hc→γP(P=η′, η, π0) are studied with a sample of (27.12±0.14)×108 ψ(3686) events collected by the BESIII detector at the BEPCII collider. The decay hc→γη is observed for the first time with the significance of 9.0σ, and the branching fraction is determined to be (3.77±0.55±0.13±0.26)×10−4, while B(hc→γη′) is measured to be (1.40±0.11±0.04±0.10)×10−3, where the first uncertainties are statistical, the second systematic, and the third from the branching fraction of ψ(3686)→π0hc. The combination of these results allows for a precise determination of Rhc=B(hc→γη)B(hc→γη′), which is calculated to be (27.0±4.4±1.0)%. The results are valuable for gaining a deeper understanding of η−η′ mixing, and its manifestation within quantum chromodynamics. No significant signal is found for the decay hc→γπ0, and an upper limit is placed on its branching fraction of B(hc→γπ0)<5.0×10−5, at the 90% confidence level.
Based on (2712.4±14.3)×106 𝑒+𝑒−→𝜓(3686) events collected with the BESIII detector operating at the BEPCII Collider, we report the first evidence of 𝜒𝑐0→Λ¯Λ𝜙 decays and the first observation of 𝜒𝑐1,2→Λ¯Λ𝜙 decays, with significances of 4.1𝜎, 11.3𝜎 and 13.0𝜎, respectively. The decay branching fractions of 𝜒𝑐0,1,2→Λ¯Λ𝜙 are measured to be (2.99±1.24±0.19)×10−5, (6.01±0.90±0.40)×10−5, and (7.13±0.81±0.36)×10−5, where the first uncertainties are statistical and the second systematic. No obvious enhancement near the Λ¯Λ production threshold or excited Λ state is found in the Λ𝜙 (or ¯Λ𝜙) system.
The energy-dependent cross section for e+e−→ηψ(2S) is measured at eighteen center of mass energies from 4.288 GeV to 4.951 GeV using the BESIII detector. Using the same data samples, we also perform the first search for the reaction e+e−→ηX~(3872), but no evidence is found for the X~(3872) in the π+π−J/ψ mass distribution. At each of the eighteen center of mass energies, upper limits at the 90\% confidence level on the cross section for e+e−→ηψ(2S) and on the product of the e+e−→ηX~(3872) cross section with the branching fraction of X~(3872)→π+π−J/ψ are reported.
Using data samples with an integrated luminosity of 4.67 fb−1 collected by the BESIII detector operating at the BEPCII collider, we search for the process e+e−→η′ψ(2S) at center-of-mass energies from 4.66 to 4.95 GeV. No significant signal is observed, and upper limits for the Born cross sections σB(e+e−→η′ψ(2S)) at the 90\% confidence level are determined.
Using data samples with an integrated luminosity of 4.67 fb−1 collected by the BESIII detector operating at the BEPCII collider, we search for the process e+e−→η′ψ(2S) at center-of-mass energies from 4.66 to 4.95 GeV. No significant signal is observed, and upper limits for the Born cross sections σB(e+e−→η′ψ(2S)) at the 90\% confidence level are determined.
Using e+e− collision data collected with the BESIII detector at the BEPCII collider at center-of-mass energies between 3.510 and 4.914GeV, corresponding to an integrated luminosity of 25 fb−1, we measure the Born cross sections for the process e+e−→K−Ξ¯+Λ/Σ0 at thirty-five energy points with a partial-reconstruction strategy. By fitting the dressed cross sections of e+e−→K−Ξ¯+Λ/Σ0, evidence for ψ(4160)→K−Ξ¯+Λ is found for the first time with a significance of 4.4σ, including systematic uncertainties. No evidence for other possible resonances is found. In addition, the products of electronic partial width and branching fraction for all assumed resonances decaying into K−Ξ¯+Λ/Σ0 are determined.
Using (27.12±0.14)×108 ψ(3686) events collected with the BESIII detector, we present the first observation of the decays χcJ→ΛΛ¯ω, where J=0,1,2, with statistical significances of 11.7σ,11.2σ, and 11.8σ. The branching fractions of these decays are determined to be B(χc0→ΛΛ¯ω)=(2.37±0.22±0.23)×10−4, B(χc1→ΛΛ¯ω)=(1.01±0.10±0.11)×10−4, and B(χc2→ΛΛ¯ω)=(1.40±0.13±0.17)×10−4, where the first uncertainties are statistical and the second are systematic. We observe no clear intermediate structures.
Six C-even states, denoted as X, with quantum numbers JPC=0−+, 1±+, or 2±+, are searched for via the e+e−→γD±sD∗∓s process using (1667.39±8.84) pb−1 of e+e− collision data collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energy of s√=(4681.92±0.30) MeV. No statistically significant signal is observed in the mass range from 4.08 to 4.32 GeV/c2. The upper limits of σ[e+e−→γX]⋅B[X→D±sD∗∓s] at a 90% confidence level are determined.
Based on (27.12±0.14)×108 𝜓(2𝑆) events collected by the BESIII detector, we search for the decay 𝜂𝑐(2𝑆)→𝜋+𝜋−𝜂𝑐 via 𝜓(2𝑆)→𝛾𝜂𝑐(2𝑆). No significant signal is observed, and the upper limit on the product branching fraction ℬ(𝜓(2𝑆)→𝛾𝜂𝑐(2𝑆))×ℬ(𝜂𝑐(2𝑆)→𝜋+𝜋−𝜂𝑐) is determined to be 2.21×10−5 at the 90% confidence level. In addition, the 𝜂𝑐(2𝑆)→𝜋+𝜋−𝐾0𝑆𝐾±𝜋∓ decay is studied via 𝜓(2𝑆)→𝛾𝜂𝑐(2𝑆) and is observed with a statistical significance of 10𝜎 for the first time. The branching fraction of 𝜂𝑐(2𝑆)→𝜋+𝜋−𝐾0𝑆𝐾±𝜋∓ is determined to be (1.33±0.11±0.40±0.95)×10−2, where the first uncertainty is statistical, the second is systematic, and the third uncertainty is due to the quoted ℬ(𝜓(2𝑆)→𝛾𝜂𝑐(2𝑆)).
Based on (2712.4±14.1)×106 𝜓(3686) events collected with the BESIII detector, we study the decays ℎ𝑐→3(𝜋+𝜋−)𝜋0, ℎ𝑐→2(𝜋+𝜋−)𝜔, ℎ𝑐→2(𝜋+𝜋−)𝜋0𝜂, ℎ𝑐→2(𝜋+𝜋−)𝜂, and ℎ𝑐→𝑝¯𝑝 via 𝜓(3686)→𝜋0ℎ𝑐. The decay channel ℎ𝑐→3(𝜋+𝜋−)𝜋0 is observed for the first time, and its branching fraction is determined to be (9.28±1.14±0.77)×10−3, where the first uncertainty is statistical and the second is systematic. In addition, first evidence is found for the modes ℎ𝑐→2(𝜋+𝜋−)𝜋0𝜂 and ℎ𝑐→2(𝜋+𝜋−)𝜔 with significances of 4.8𝜎 and 4.7𝜎, and their branching fractions are determined to be (7.55±1.51±0.77)×10−3 and (4.00±0.86±0.35)×10−3, respectively. No significant signals of ℎ𝑐→2(𝜋+𝜋−)𝜂 and ℎ𝑐→𝑝¯𝑝 are observed, and the upper limits of the branching fractions of these decays are determined to be <6.19×10−4 and <4.40×10−5 at the 90% confidence level, respectively.
Six C-even states, denoted as X, with quantum numbers JPC=0−+, 1±+, or 2±+, are searched for via the e+e−→γD±sD∗∓s process using (1667.39±8.84) pb−1 of e+e− collision data collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energy of s√=(4681.92±0.30) MeV. No statistically significant signal is observed in the mass range from 4.08 to 4.32 GeV/c2. The upper limits of σ[e+e−→γX]⋅B[X→D±sD∗∓s] at a 90% confidence level are determined.
Observation of χcJ → 3(K⁺K⁻)
(2024)
By analyzing (27.12±0.14)×108 𝜓(3686) events collected with the BESIII detector operating at the BEPCII collider, the decay processes 𝜒𝑐𝐽→3(𝐾+𝐾−) (𝐽=0, 1, 2) are observed for the first time with statistical significances of 8.2𝜎, 8.1𝜎, and 12.4𝜎, respectively. The product branching fractions of 𝜓(3686)→𝛾𝜒𝑐𝐽, 𝜒𝑐𝐽→3(𝐾+𝐾−) are presented and the branching fractions of 𝜒𝑐𝐽→3(𝐾+𝐾−) decays are determined to be ℬ𝜒𝑐0→3(𝐾+𝐾−)=(10.7±1.8±1.1)×10−6, ℬ𝜒𝑐1→3(𝐾+𝐾−)=(4.2±0.9±0.5)×10−6, and ℬ𝜒𝑐2→3(𝐾+𝐾−)=(7.2±1.1±0.8)×10−6, where the first uncertainties are statistical and the second are systematic.