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This paper reports the study of D+s→τ+ν via τ+→π+ν¯τ using a boosted decision tree method, with 7.33 fb−1 of e+e− collision data collected by the BESIII detector at center-of-mass energies between 4.128 and 4.226~GeV. The branching fraction of D+s→τ+ντ is determined to be (5.44±0.17stat±0.13syst)%. The product of the D+s decay constant fD+s and the CKM matrix element |Vcs| is fD+s|Vcs| =(248.3±3.9stat±3.1syst±1.0input) MeV. Combining with the |Vcs| value obtained from the Standard Model global fit or the fD+s from the lattice quantum chromodynamics, we determine |Vcs| = 0.993±0.015stat±0.012syst±0.004input and fD+s =(255.0±4.0stat±3.2syst±1.0input) MeV. The first uncertainty is statistical, the second one is systematic and the third one is due to the input parameters, mainly the lifetime of D+s. All results obtained in this work supersede the BESIII previous results based on 6.32 fb−1 of e+e− collision data taken at center-of-mass energies between 4.178 and 4.226~GeV.
Precise measurement of the branching fractions of of J/ψ → Λ¯π⁺Σ⁻ + c.c. and J/ψ → Λ¯π⁻Σ⁺ + c.c.
(2023)
Based on a data sample of (10087±44)×106 J/ψ events collected with the BESIII detector, the branching fraction of J/ψ→Λ¯π+Σ−+c.c. is measured to be (1.221±0.002±0.038)×10−3, and the branching fraction of its isospin partner mode J/ψ→Λ¯π−Σ++c.c. is measured to be (1.244±0.002±0.045)×10−3 with improved precision. Here the first uncertainties are statistical and the second ones systematic. The isospin symmetry of the Σ baryon in charmonium hadronic decay and the "12% rule" are tested, and no violation is found. The potential of using these channels as Σ baryon sources for nuclear physics research is studied, and the momentum and angular distributions of these sources are provided.
Using 𝑒+𝑒− collision data corresponding to an integrated luminosity of 7.33 fb−1 recorded by the BESIII detector at center-of-mass energies between 4.128 and 4.226 GeV, we present an analysis of the decay 𝐷+𝑠→𝜋+𝜋−𝑒+𝜈𝑒, where the 𝐷+𝑠 is produced via the process 𝑒+𝑒−→𝐷*±𝑠𝐷∓𝑠. We observe the 𝑓0(980) in the 𝜋+𝜋− system and the branching fraction of the decay 𝐷+𝑠→𝑓0(980)𝑒+𝜈𝑒 with 𝑓0(980)→𝜋+𝜋− measured to be (1.72±0.13stat±0.10syst)×10−3, where the uncertainties are statistical and systematic, respectively. The dynamics of the 𝐷+𝑠→𝑓0(980)𝑒+𝜈𝑒 decay are studied with the simple pole parametrization of the hadronic form factor and the Flatté formula describing the 𝑓0(980) in the differential decay rate, and the product of the form factor 𝑓𝑓0+(0) and the 𝑐→𝑠 Cabibbo-Kobayashi-Maskawa matrix element |𝑉𝑐𝑠| is determined for the first time to be 𝑓𝑓0+(0)|𝑉𝑐𝑠|=0.504±0.017stat±0.035syst. Furthermore, the decay 𝐷+
𝑠→𝑓0(500)𝑒+𝜈𝑒 is searched for the first time but no signal is found. The upper limit on the branching fraction of 𝐷+𝑠→𝑓0(500)𝑒+𝜈𝑒, 𝑓0(500)→𝜋+𝜋− decay is set to be 3.3×10−4 at 90% confidence level.
Using 7.33 fb−1 of e+e− collision data taken with the BESIII detector at the BEPCII collider, we report the first experimental study of the purely leptonic decay D∗+s→e+νe. A signal for the decay D∗+s→e+νe is observed with a statistical significance of 2.9σ. The branching fraction of D∗+s→e+νe is measured to be (2.1+1.2−0.9stat.±0.2syst.)×10−5, corresponding to an upper limit of 4.0×10−5 at the 90\% confidence level. Taking the total width of the D∗+s~((0.070±0.028) keV) predicted by lattice quantum chromodynamics as input, the decay constant of the D∗+s is determined to be fD∗+s=(213.6+61.0−45.8stat.±43.9syst.) MeV, corresponding to an upper limit of 353.8 MeV at the 90\% confidence level.
Based on 4.4 fb−1 of e+e− annihilation data collected at the center-of-mass energies between 4.60 and 4.70 GeV with the BESIII detector at the BEPCII collider, the pure \textit{W}-boson-exchange decay Λ+c→Ξ0K+ is studied with a full angular analysis. The corresponding decay asymmetry is measured for the first time to be αΞ0K+=0.01±0.16(stat.)±0.03(syst.). This result reflects the non-interference effect between the S- and P-wave amplitudes. The phase shift between S- and P-wave amplitudes has two solutions, which are δp−δs=−1.55±0.25(stat.)±0.05(syst.) rad or 1.59±0.25(stat.)±0.05(syst.) rad.
Improved measurement of the decays η′ → π⁺π⁻π⁺⁽⁰⁾π⁻⁽⁰⁾ and search for the rare decay η′ → 4π⁰
(2024)
Using a sample of 10 billion J/ψ events collected with the BESIII detector, the decays η′→π+π−π+π−, η′→π+π−π0π0 and η′→4π0 are studied via the process J/ψ→γη′. The branching fractions of η′→π+π−π+π− and η′→π+π−π0 π0 are measured to be (8.56±0.25(stat.)±0.23(syst.))×10−5 and (2.12±0.12(stat.)±0.10(syst.))×10−4, respectively, which are consistent with previous measurements but with improved precision. No significant η′→4π0 signal is observed, and the upper limit on the branching fraction of this decay is determined to be less than 1.24×10−5 at the 90% confidence level. In addition, an amplitude analysis of η′→π+π−π+π− is performed to extract the doubly virtual isovector form factor α for the first time. The measured value of α=1.22±0.33(stat.)±0.04(syst.), is in agreement with the prediction of the VMD model.
Based on 4.4 fb−1 of e+e− annihilation data collected at the center-of-mass energies between 4.60 and 4.70 GeV with the BESIII detector at the BEPCII collider, the pure \textit{W}-boson-exchange decay Λ+c→Ξ0K+ is studied with a full angular analysis. The corresponding decay asymmetry is measured for the first time to be αΞ0K+=0.01±0.16(stat.)±0.03(syst.). This result reflects the non-interference effect between the S- and P-wave amplitudes. The phase shift between S- and P-wave amplitudes has two solutions, which are δp−δs=−1.55±0.25(stat.)±0.05(syst.) rad or 1.59±0.25(stat.)±0.05(syst.) rad.
Based on 4.4 fb−1 of e+e− annihilation data collected at the center-of-mass energies between 4.60 and 4.70 GeV with the BESIII detector at the BEPCII collider, the pure W-exchange decay Λ+c→Ξ0K+ is studied with a full angular analysis. The corresponding decay asymmetry is measured for the first time to be αΞ0K+=0.01±0.16(stat.)±0.03(syst.). This result reflects the interference between the S- and P-wave amplitudes. The phase shift between S- and P-wave amplitudes is δp−δs=−1.55±0.25(stat.)±0.05(syst.) rad.
The singly Cabibbo-suppressed decay Λ+𝑐→Σ−𝐾+𝜋+ is observed for the first time with a statistical significance of 5.4𝜎 by 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. The absolute branching fraction of Λ+𝑐→Σ−𝐾+𝜋+ is measured to be (3.8±1.2stat±0.2syst)×10−4 in a model-independent approach. This is the first observation of a Cabibbo-suppressed Λ+𝑐 decay involving Σ− in the final state. The ratio of branching fractions between Λ+𝑐→Σ−𝐾+𝜋+ and the Cabibbo-favored decay Λ+𝑐→Σ−𝜋+𝜋+ is observed to be (0.4±0.1)𝑠2𝑐, where 𝑠𝑐≡sin𝜃𝑐=0.2248 with 𝜃𝑐 the Cabibbo mixing angle.
Using 7.33 fb−1 of e+e− collision data taken with the BESIII detector at the BEPCII collider, we report the first experimental study of the purely leptonic decay D∗+s→e+νe. A signal for the decay D∗+s→e+νe is observed with a statistical significance of 2.9σ. The branching fraction of D∗+s→e+νe is measured to be (2.1+1.2−0.9stat.±0.2syst.)×10−5, corresponding to an upper limit of 4.0×10−5 at the 90\% confidence level. Taking the total width of the D∗+s~((0.070±0.028) keV) predicted by lattice quantum chromodynamics as input, the decay constant of the D∗+s is determined to be fD∗+s=(213.6+61.0−45.8stat.±43.9syst.) MeV, corresponding to an upper limit of 353.8 MeV at the 90\% confidence level.
The cross sections of the e+e−→ϕη′ process at center-of-mass energies from 3.508 to 4.951 GeV are measured with high precision using 26.1 fb−1 data collected with the BESIII detector operating at the BEPCII storage ring. The cross sections are of the order of a few picobarn, and decrease as the center-of-mass energy increases as s−n/2 with n=4.35±0.14. This result is in agreement with the Nambu-Jona-Lasinio model prediction of n=3.5±0.9. In addition, the charmless decay ψ(3770)→ϕη′ is searched for by fitting the measured cross sections, yet no significant signal is observed. The upper limit of B(ψ(3770)→ϕη′) at the 90\% confidence level is determined to be 2.3×10−5.
The cross sections of the e+e−→ϕη′ process at center-of-mass energies from 3.508 to 4.951 GeV are measured with high precision using 26.1 fb−1 data collected with the BESIII detector operating at the BEPCII storage ring. The cross sections are of the order of a few picobarn, and decrease as the center-of-mass energy increases as s−n/2 with n=4.35±0.14. This result is in agreement with the Nambu-Jona-Lasinio model prediction of n=3.5±0.9. In addition, the charmless decay ψ(3770)→ϕη′ is searched for by fitting the measured cross sections, yet no significant signal is observed. The upper limit of B(ψ(3770)→ϕη′) at the 90\% confidence level is determined to be 2.3×10−5.
Based on 4.4 fb−1 of e+e− annihilation data collected at the center-of-mass energies between 4.60 and 4.70 GeV with the BESIII detector at the BEPCII collider, the pure W-exchange decay Λ+c→Ξ0K+ is studied with a full angular analysis. The corresponding decay asymmetry is measured for the first time to be αΞ0K+=0.01±0.16(stat.)±0.03(syst.). This result reflects the interference between the S- and P-wave amplitudes. The phase shift between S- and P-wave amplitudes is δp−δs=−1.55±0.25(stat.)±0.05(syst.) rad.
Based on 4.4 fb−1 of e+e− annihilation data collected at the center-of-mass energies between 4.60 and 4.70 GeV with the BESIII detector at the BEPCII collider, the pure W-exchange decay Λ+c→Ξ0K+ is studied with a full angular analysis. The corresponding decay asymmetry is measured for the first time to be αΞ0K+=0.01±0.16(stat.)±0.03(syst.). This result reflects the interference between the S- and P-wave amplitudes. The phase shift between S- and P-wave amplitudes is δp−δs=−1.55±0.25(stat.)±0.05(syst.) rad.
We study the process e+e−→Λ+cΛ¯−c at twelve center-of-mass energies from 4.6119 to 4.9509 GeV using data samples collected by the BESIII detector at the BEPCII collider. The Born cross sections and effective form factors (|Geff|) are determined with unprecedented precision after combining the single and double-tag methods based on the decay process Λ+c→pK−π+. Flat cross sections around 4.63 GeV are obtained and no indication of the resonant structure Y(4630), as reported by Belle, is found. In addition, no oscillatory behavior is discerned in the |Geff| energy-dependence of Λ+c, in contrast to what is seen for the proton and neutron cases. Analyzing the cross section together with the polar-angle distribution of the Λ+c baryon at each energy point, the moduli of electric and magnetic form factors (|GE| and |GM|) are extracted and separated. For the first time, the energy-dependence of the form factor ratio |GE/GM| is observed, which can be well described by an oscillatory function.
We study the process e+e−→Λ+cΛ¯−c at twelve center-of-mass energies from 4.6119 to 4.9509 GeV using data samples collected by the BESIII detector at the BEPCII collider. The Born cross sections and effective form factors (|Geff|) are determined with unprecedented precision after combining the single and double-tag methods based on the decay process Λ+c→pK−π+. Flat cross sections around 4.63 GeV are obtained and no indication of the resonant structure Y(4630), as reported by Belle, is found. In addition, no oscillatory behavior is discerned in the |Geff| energy-dependence of Λ+c, in contrast to what is seen for the proton and neutron cases. Analyzing the cross section together with the polar-angle distribution of the Λ+c baryon at each energy point, the moduli of electric and magnetic form factors (|GE| and |GM|) are extracted and separated. For the first time, the energy-dependence of the form factor ratio |GE/GM| is observed, which can be well described by an oscillatory function.
Based on (10087±44)×106 J/ψ events collected with the BESIII detector, a partial wave analysis of the decay J/ψ→γK0SK0Sη′ is performed. The mass and width of the X(2370) are measured to be 2395±11(stat)+26−94(syst) MeV/c2 and 188+18−17(stat)+124−33(syst) MeV, respectively. The corresponding product branching fraction is B[J/ψ→γX(2370)]×B[X(2370)→f0(980)η′]×B[f0(980)→K0SK0S]=(1.31±0.22(stat)+2.85−0.84(syst))×10−5. The statistical significance of the X(2370) is greater than 11.7σ and the spin-parity is determined to be 0−+ for the first time. The measured mass and spin-parity of the X(2370) are consistent with the predictions of the lightest pseudoscalar glueball.
Based on a data set of (27.12±0.10)×108 ψ(3686) events collected at the BESIII experiment, the absolute branching fractions of the three dominant Ω− decays are measured to be BΩ−→Ξ0π−=(25.03±0.44±0.53)%, BΩ−→Ξ−π0=(8.43±0.52±0.28)%, and BΩ−→ΛK−=(66.3±0.8±2.0)%, where the first and second uncertainties are statistical and systematic, respectively. The ratio between BΩ−→Ξ0π− and BΩ−→Ξ−π0 is determined to be 2.97±0.19±0.11, which is in good agreement with the PDG value of 2.74±0.15, but greater by more than four standard deviations than the theoretical prediction of 2 obtained from the ΔI=1/2 rule.
By analyzing 7.33 fb−1 of e+e− annihilation data collected at center-of-mass energies between 4.128 and 4.226 GeV with the BESIII detector, we report the observation of the semileptonic decay D+s→η′μ+νμ, with a statistical significance larger than 10σ, and the measurements of the D+s→ημ+νμ and D+s→η′μ+νμ decay dynamics for the first time. The branching fractions of D+s→ημ+νμ and D+s→η′μ+νμ are determined to be (2.235±0.051stat±0.052syst)% and (0.801±0.055stat±0.028syst)%, respectively, with precision improved by factors of 6.0 and 6.6 compared to the previous best measurements. Combined with the results for the decays D+s→ηe+νe and D+s→η′e+νe, the ratios of the decay widths are examined both inclusively and in several ℓ+νℓ four-momentum transfer ranges. No evidence for lepton flavor universality violation is found within the current statistics. The products of the hadronic form factors fη(′)+,0(0) and the c→s Cabibbo-Kobayashi-Maskawa matrix element |Vcs| are determined. The results based on the two-parameter series expansion are fη+,0(0)|Vcs| = 0.452±0.010stat±0.007syst and fη′+,0(0)|Vcs| = 0.504±0.037stat±0.012syst, which help to constrain present models on fη(′)+,0(0). The forward-backward asymmetries are determined to be ⟨AηFB⟩=−0.059±0.031stat±0.005syst and ⟨Aη′FB⟩=−0.064±0.079stat±0.006syst for the first time, which are consistent with the theoretical calculation.
Measurement of e⁺e⁻ → π⁺π⁻D⁺D⁻ cross sections at center-of-mass energies from 4.190 to 4.946 GeV
(2022)
Using data samples collected with the BESIII detector operating at the BEPCII storage ring, we measure the cross sections of the e+e−→π+π−D+D− process at center-of-mass energies from 4.190 to 4.946 GeV with a partial reconstruction method. Two resonance structures are seen and the resonance parameters are determined from a fit to the cross section line shape. The first resonance we observe has a mass of (4373.1 ± 4.0 ± 2.2) MeV/c2 and a width of (146.5 ± 7.4 ± 1.3) MeV, in agreement with those of the Y(4390) state; the other resonance has a mass of (4706 ± 11 ± 4) MeV/c2, a width of (45 ± 28 ± 9) MeV, and a statistical significance of 4.1 standard deviations (σ). This is the first evidence for a vector state at this mass value. The spin-3 D-wave charmonium state X(3842) is searched for through the e+e−→π+π−X(3842)→π+π−D+D− process, and evidence with a significance of 4.2σ is found in the data samples with center-of-mass energies from 4.600 to 4.700 GeV.