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Using data corresponding to an integrated luminosity of 651 pb−1 accumulated at 22 center-of-mass energy points between 2.0000 and 3.0800 GeV by the BESIII experiment, the process e+e−→ϕπ+π− is studied. The Born cross sections for e+e−→ϕπ+π− are consistent with previous results, but with improved precision. A fit to the cross section is performed, which reveals contributions from two structures: the first one has a mass of M = (2158+30−33 ± 4) MeV/c2 and a width of Γ = (218+81−64 ± 5) MeV, and the second one has a mass of M = (2298+60−44 ± 6) MeV/c2 and a width of Γ = (219+117−112 ± 6) MeV, where the first uncertainties are statistical and the second systematic.
Using an 𝑒+𝑒− collision data sample of (27.08±0.14)×108 𝜓(3686) events collected by the BESIII detector, we report the first observation of 𝜒𝑐𝐽→Ω−¯Ω+ (𝐽=0, 1, 2) decays with significances of 5.6𝜎, 6.4𝜎, and 18𝜎, respectively, where the 𝜒𝑐𝐽 mesons are produced in the radiative 𝜓(3686) decays. The branching fractions are determined to be ℬ(𝜒𝑐0→Ω−¯Ω+) = (3.51±0.54±0.29)×10−5, ℬ(𝜒𝑐1→Ω−¯Ω+)=(1.49±0.23±0.10)×10−5, and ℬ(𝜒𝑐2→Ω−¯Ω+)=(4.52±0.24±0.18)×10−5, where the first and second uncertainties are statistical and systematic, respectively.
Using data corresponding to an integrated luminosity of 651 pb−1 accumulated at 22 center-of-mass energies from 2.00 to 3.08 GeV by the BESIII experiment, the process 𝑒+𝑒−→𝜙𝜋+𝜋− is studied. The cross sections for 𝑒+𝑒−→𝜙𝜋+𝜋− are consistent with previous results, but with improved precision. To measure the mass and width of the structure observed in the cross section line shape, a combine fit is performed after enhancing the contribution from 𝜙𝑓0(980). The fit reveals a structure with the mass of 𝑀=2178±20±5 MeV/𝑐2 and the width of Γ=140±36±16 MeV, where the first uncertainties are statistical and the second ones are systematic.
Using (1.0087±0.0044)×1010 𝐽/𝜓 events collected by the BESIII detector at the BEPCII collider, we report the first search for the baryon and lepton number violating decays Ξ0→𝐾−𝑒+ with Δ(𝐵−𝐿)=0 and Ξ0→𝐾+𝑒− with |Δ(𝐵−𝐿)|=2, where 𝐵 (𝐿) is the baryon (lepton) number. While no signal is observed, the upper limits on the branching fractions of these two decays are set to ℬ(Ξ0→𝐾−𝑒+)<3.6×10−6 and ℬ(Ξ0→𝐾+𝑒−)<1.9×10−6 at the 90% confidence level, respectively. These results offer a direct probe of baryon number violating interactions involving a strange quark.
We search for the di-photon decay of a light pseudoscalar axion-like particle, a, in radiative decays of the J/ψ, using 10 billion J/ψ events collected with the BESIII detector. We find no evidence of a narrow resonance and set upper limits at the 95% confidence level on the product branching fraction B(J/ψ→γa)×B(a→γγ) and the axion-like particle photon coupling constant gaγγ in the ranges of (3.6−49.8)×10−8 and (2.2−103.8)×10−4 GeV−1, respectively, for 0.18≤ma≤2.85 GeV/c2. These are the most stringent limits to date in this mass region.
Based on 4.5 fb−1 of e+e− collision data accumulated at center-of-mass energies between 4599.53 MeV and 4698.82 MeV with the BESIII detector, the decay Λ+c→nK0Sπ+π0 is observed for the first time with a significance of 9.2σ. The branching fraction is measured to be (0.85±0.13±0.03)%, where the first uncertainty is statistical and the second systematic, which differs from the theoretical prediction based on isospin by 4.4σ. This indicates that there may be resonant contributions or some unknown dynamics in this decay.
We search for the di-photon decay of a light pseudoscalar axion-like particle, a, in radiative J/ψ decays, using 10 billion J/ψ events collected with the BESIII detector. We find no evidence of a signal and set upper limits at the 95% confidence level on the product branching fraction B(J/ψ→γa)×B(a→γγ) and the axion-like particle photon coupling constant gaγγ in the ranges of (3.7−48.5)×10−8 and (2.2−101.8)×10−4 GeV−1, respectively, for 0.18≤ma≤2.85 GeV/c2. These are the most stringent limits to date in this mass region.
The absolute branching fraction of the decay Λc(2625)+→Λ+cπ+π− is measured for the first time to be (50.7±5.0stat.±4.9syst.)% with 368.48 pb−1 of e+e− collision data collected by the BESIII detector at the center-of-mass energies of s√=4.918 and 4.950 GeV. This result is lower than the naive prediction of 67\%, obtained from isospin symmetry, by more than 2σ, thereby indicating that the novel mechanism referred to as the \textit{threshold effect}, proposed for the strong decays of Λc(2595)+, also applies to Λc(2625)+. This measurement is necessary to obtain the coupling constants for the transitions between s-wave and p-wave charmed baryons in heavy hadron chiral perturbation theory. In addition, we search for the decay Λc(2595)+→Λ+cπ+π−. No significant signal is observed, and the upper limit on its branching fraction is determined to be 80.8\% at the 90\% confidence level.
Using (10087±44)×106 J/ψ events collected with the BESIII detector, the radiative hyperon decay Σ→pγ is studied at an electron-positron collider experiment for the first time. The absolute branching fraction is measured to be (0.996±0.021stat.±0.018syst.)×10−3, which is lower than its world average value by 4.2 standard deviations. Its decay asymmetry parameter is determined to be −0.652±0.056stat.±0.020syst.. The branching fraction and decay asymmetry parameter are the most precise to date, and the accuracies are improved by 78% and 34%, respectively.
Using (10087±44)×106 J/ψ events collected with the BESIII detector, the radiative hyperon decay Σ→pγ is studied at an electron-positron collider experiment for the first time. The absolute branching fraction is measured to be (0.996±0.021stat.±0.018syst.)×10−3, which is lower than its world average value by 4.2 standard deviations. Its decay asymmetry parameter is determined to be −0.652±0.056stat.±0.020syst.. The branching fraction and decay asymmetry parameter are the most precise to date, and the accuracies are improved by 78% and 34%, respectively.
We search for the semi-leptonic decays Λ + c → Λπ+π−e+νe and Λ + c → pK0 Sπ−e+νe in a sample of 4.5 fb−1 of e+e− annihilation data collected in the center-of-mass energy region between 4.600 GeV and 4.699 GeV by the BESIII detector at the BEPCII. No significant signals are observed, and the upper limits on the decay branching fractions are set to be B(Λ+c → Λπ+π−e+νe ) < 3.9 × 10−4 and B(Λ + c → pK0Sπ−e+νe ) < 3.3 × 10−4 at the 90% confidence level, respectively.
Using a data sample of e+e− collision data corresponding to an integrated luminosity of 19 fb−1 collected with the BESIII detector at the BEPCII collider, we search for the production of deuterons and antideuterons via e+e−→ppπ−d¯+c.c. for the first time at center-of-mass energies between 4.13 and 4.70 GeV. No significant signal is observed and the upper limit of the e+e−→ppπ−d¯+c.c. cross section is determined to be from 9.0 to 145 fb depending on the center-of-mass energy at the 90% confidence level.
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.
First study of reaction Ξ⁰n → Ξ⁻ p using Ξ⁰-nucleus scattering at an electron-positron collider
(2023)
Using ð1.0087 0.0044Þ × 1010 J=ψ events collected with the BESIII detector at the BEPCII storage ring, the process Ξ0n → Ξ−p is studied, where the Ξ0 baryon is produced in the process J=ψ → Ξ0Ξ¯ 0 and the neutron is a component of the 9 Be, 12C, and 197Au nuclei in the beam pipe. A clear signal is observed with a statistical significance of 7.1σ. The cross section of the reaction Ξ0 þ 9 Be → Ξ− þ p þ 8 Be is determined to be σðΞ0 þ 9 Be → Ξ− þ p þ 8 BeÞ¼ð22.1 5.3stat 4.5sysÞ mb at the Ξ0 momentum of 0.818 GeV=c, where the first uncertainty is statistical and the second is systematic. No significant H-dibaryon signal is observed in the Ξ−p final state. This is the first study of hyperon-nucleon interactions in electron-positron collisions and opens up a new direction for such research.
Using initial-state radiation events from a total integrated luminosity of 11.957 fb−1 of 𝑒+𝑒− collision data collected at center-of-mass energies between 3.773 and 4.258 GeV with the BESIII detector at BEPCII, the cross section for the process 𝑒+𝑒−→Λ¯Λ is measured in 16 Λ¯Λ invariant mass intervals from the production threshold up to 3.00 GeV/𝑐2. The results are consistent with previous results from BABAR and BESIII, but with better precision and with narrower Λ¯Λ invariant mass intervals than BABAR.
A precision measurement of the matrix elements for η→π+π−π0 and η→π0π0π0 decays is performed using a sample of (10087±44)×106 J/ψ decays collected with the BESIII detector. The decay J/ψ→γη is used to select clean samples of 631,686 η→π+π−π0 decays and 272,322 η→π0π0π0 decays. The matrix elements for both channels are in reasonable agreement with previous measurements. The non-zero gX2Y term for the decay mode η→π+π−π0 is confirmed, as reported by the KLOE Collaboration, while the other higher-order terms are found to be insignificant. Dalitz plot asymmetries in the η→π+π−π0 decay are also explored and are found to be consistent with charge conjugation invariance. In addition, a cusp effect is investigated in the η→π0π0π0 decay, and no obvious structure around the π+π− mass threshold is observed.
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.
Using (2712.4±14.3)×106 ψ(3686) events collected with the BESIII detector operating at the BEPCII collider, we search for the hadronic transition hc→π+π−J/ψ via ψ(3686)→π0hc. No significant signal is observed. We set the most stringent upper limits to date on the branching fractions B(ψ(3686)→π0hc)×B(hc→π+π−J/ψ) and B(hc→π+π−J/ψ) at the 90% confidence level, which are determined to be 6.7×10−7 and 9.4×10−4, respectively.
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.
Measurement of e⁺e⁻ → ΛΛ¯η from 3.5106 to 4.6988 GeV and study of ΛΛ¯ mass threshold enhancement
(2022)
Using data samples with a total integrated luminosity of approximately 18 fb−1 collected by the BESIII detector operating at the BEPCII, the process e+e−→ΛΛ¯η is studied at center-of-mass energies between 3.5106 and 4.6988 GeV. The Born cross section for the process e+e−→ΛΛ¯η is measured. No significant structure is observed in the Born cross section line shape. An enhancement near the ΛΛ¯ mass threshold is observed for the first time in the process. The structure can be described by an S-wave Breit-Wigner function. Neglecting contribution of excited Λ states and potential interferences, the mass and width are determined to be (2356±7±17) MeV/c2 and (304±28±54) MeV, respectively, where the first uncertainties are statistical and the second are systematic.