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Measurement of e⁺e⁻ → ϕη′ cross sections at center-of-mass energies
between 3.508 and 4.600 GeV
(2023)
We present a measurement of the dressed cross sections for e+e−→ϕη′ at different center-of-mass energies between 3.508 and 4.600 GeV based on 15.1 fb−1 of e+e− annihilation data collected with the BESIII detector operating at the BEPCII collider. In addition, a search for the decay Y(4230)→ϕη′ is performed. No clear signal is observed and the corresponding upper limit is provided.
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 e+e− annihilation data corresponding to an integrated luminosity of 6.32 fb−1 collected at center-of-mass energies between 4.178 GeV and 4.226 GeV with the BESIII detector, we perform the first amplitude analysis of the decay D+s→K0SK+π0 and determine the relative branching fractions and phases for intermediate processes. We observe the a0(1710)+, the isovector partner of the f0(1710) and f0(1770) mesons, in its decay to K0SK+ for the first time. In addition, we measure the ratio B(D+s→K¯∗(892)0K+)B(D+s→K¯0K∗(892)+) to be 2.35+0.42−0.23stat.±0.10syst.. Finally, we provide a precision measurement of the absolute branching fraction B(D+s→K0SK+π0)=(1.46±0.06stat.±0.05syst.)%.
Based on (10087±44)×106 J/ψ events collected with the BESIII detector, the process J/ψ→γπ+π−η′ is studied using two dominant decay channels of the η′ meson, η′→γπ+π− and η′→ηπ+π−,η→γγ. The X(2600) is observed with a statistical significance larger than 20σ in the π+π−η′ invariant mass spectrum, and it has a strong correlation to a structure around 1.5 GeV/{\it c}2 in the π+π− invariant mass spectrum. A simultaneous fit on the π+π−η′ and π+π− invariant mass spectra with the two η′ decay modes indicates that the mass and width of the X(2600) state are 2617.8±2.1+18.2−1.9 MeV/{\it c}2 and 200±8+20−17 MeV, respectively. The corresponding branching fractions are measured to be B(J/ψ→γX(2600))⋅B(X(2600)→f0(1500)η′)⋅B(f0(1500)→π+π−) = (3.39±0.18+0.91−0.66)×10−5 and B(J/ψ→γX(2600))⋅B(X(2600)→f′2(1525)η′)⋅B(f′2(1525)→π+π−) = (2.43±0.13+0.31−1.11)×10−5, where the first uncertainties are statistical, and the second systematic.
The integrated luminosities of data samples collected in the BESIII experiment in 2016–2017 at center-of-mass energies between 4.19 and 4.28 GeV are measured with a precision better than 1% by analyzing large-angle Bhabha scattering events. The integrated luminosities of old datasets collected in 2010–2014 are updated by considering corrections related to detector performance, offsetting the effect of newly discovered readout errors in the electromagnetic calorimeter, which can haphazardly occur.
Analyzing (448.1±2.9)×106 ψ(3686) events collected with the BESIII detector at the BEPCII collider, the ψ(3686)→ωK0SK0S decay is observed for the first time. The branching fraction for this decay is determined to be Bψ(3686)→ωK0SK0S=(7.04±0.39±0.36)×10−5, where the first uncertainty is statistical and the second is systematic.
Using e+e− collision data samples with center-of-mass energies ranging from 2.000 to 2.644 GeV, collected by the BESIII detector at the BEPCII collider, and with a total integrated luminosity of 300 pb^{-1}, a partial-wave analysis is performed for the process e+e−→K+K−π0π0. The total Born cross sections for the process e+e−→K+K−π0π0, as well as the Born cross sections f or the subprocesses e+e−→ϕπ0π0, K+(1460)K−, K+1(1400)K−, K+1(1270)K− and K∗+(892)K∗−(892), are measured versus the center-of-mass energy. The corresponding results for e+e−→K+K−π0π0 and ϕπ0π0 are consistent with those of BaBar and have much improved this http URL analyzing the cross sections for the four subprocesses, K+(1460)K−, K+1(1400)K−, K+1(1270)K− and K∗+K∗−, a structure with mass M = (2126.5 ± 16.8 ± 12.4)~MeV/c^{2} and width Γ = (106.9 ± 32.1 ± 28.1)~MeV is observed with an overall statistical significance of 6.3 σ, although with very limited significance in the subprocesses e+e−→K+1(1270)K− and K∗+(892)K∗−(892). The resonant parameters of the observed structure suggest it can be identified with the ϕ(2170), thus the results provide valuable input to the internal nature of the ϕ(2170).
Using e+e− collision data samples with center-of-mass energies ranging from 2.000 to 2.644 GeV, collected by the BESIII detector at the BEPCII collider, and with a total integrated luminosity of 300 pb^{-1}, a partial-wave analysis is performed for the process e+e−→K+K−π0π0. The total Born cross sections for the process e+e−→K+K−π0π0, as well as the Born cross sections f or the subprocesses e+e−→ϕπ0π0, K+(1460)K−, K+1(1400)K−, K+1(1270)K− and K∗+(892)K∗−(892), are measured versus the center-of-mass energy. The corresponding results for e+e−→K+K−π0π0 and ϕπ0π0 are consistent with those of BaBar and have much improved this http URL analyzing the cross sections for the four subprocesses, K+(1460)K−, K+1(1400)K−, K+1(1270)K− and K∗+K∗−, a structure with mass M = (2126.5 ± 16.8 ± 12.4)~MeV/c^{2} and width Γ = (106.9 ± 32.1 ± 28.1)~MeV is observed with an overall statistical significance of 6.3 σ, although with very limited significance in the subprocesses e+e−→K+1(1270)K− and K∗+(892)K∗−(892). The resonant parameters of the observed structure suggest it can be identified with the ϕ(2170), thus the results provide valuable input to the internal nature of the ϕ(2170).
Using a data sample of (448.1±2.9)×106 ψ(3686) decays collected by the BESIII detector at the Beijing Electron Positron Collider (BEPCII), we observe the decays χcJ→ϕϕη (J=0, 1, 2), where the χcJ are produced via the radiative processes ψ(3686)→γχcJ. The branching fractions are measured to be B(χc0→ϕϕη)=(8.41±0.74±0.62)×10−4, B(χc1→ϕϕη)=(2.96±0.43±0.22)×10−4, and B(χc2→ϕϕη)=(5.33±0.52±0.39)×10−4, where the first uncertainties are statistical and the second are systematic. We also search for intermediate states in the ϕϕ or ηϕ combinations, but no significant structure is seen due to the limited statistics.
The process 𝑒+𝑒−→𝜙𝜂′ has been studied for the first time in detail using data sample collected with the BESIII detector at the BEPCII collider at center of mass energies from 2.05 to 3.08 GeV. A resonance with quantum numbers 𝐽𝑃𝐶=1−− is observed with mass 𝑀=(2177.5±4.8(stat)±19.5(syst))MeV/𝑐2 and width Γ=(149.0±15.6(stat)±8.9(syst)) MeV with a statistical significance larger than 10𝜎, including systematic uncertainties. If the observed structure is identified with the 𝜙(2170), then the ratio of partial width between the 𝜙𝜂′ by BESIII and 𝜙𝜂 by BABAR is (ℬ𝑅𝜙𝜂Γ𝑅𝑒𝑒)/(ℬ𝑅𝜙𝜂′Γ𝑅𝑒𝑒)=0.23±0.10(stat)±0.18(syst), which is smaller than the prediction of the 𝑠¯𝑠𝑔 hybrid models by several orders of magnitude.