A bstract Based on e + e − collision data collected at center-of-mass energies from 2.000 to 3.080 GeV by the BESIII detector at the BEPCII collider, a partial wave analysis is performed for the ...process e + e − → $$ {K}_S^0{K}_L^0 $$ K S 0 K L 0 π 0 . The results allow the Born cross sections of the process e + e − → $$ {K}_S^0{K}_L^0 $$ K S 0 K L 0 π 0 , as well as its subprocesses e + e − → K ∗ (892) 0 $$ \overline{K} $$ K ¯ 0 and $$ {K}_2^{\ast } $$ K 2 ∗ (1430) 0 $$ \overline{K} $$ K ¯ 0 to be measured. The Born cross sections for e + e − → $$ {K}_S^0{K}_L^0 $$ K S 0 K L 0 π 0 are consistent with previous measurements by BaBar, but with substantially improved precision. The Born cross section lineshape of the process e + e − K ∗ (892) 0 $$ \overline{K} $$ K ¯ 0 is consistent with a vector meson state around 2.2 GeV with a significance of 3.2 σ . A Breit-Wigner fit determines its mass as M Y = (2164 . 7 ± 9 . 1 ± 3 . 1) MeV /c 2 and its width as Γ Y = (32 . 4 ± 21 . 0 ± 1 . 8) MeV.
Measurement of chi(cJ) decaying into eta ' K+K Ablikim, M.; Albrecht, M.; Braun, S. ...
Physical review. D, Particles, fields, gravitation, and cosmology,
04/2014, Volume:
89, Issue:
7
Journal Article
Peer reviewed
Open access
Using (106.41 +/- 0.86) x 10(6) Psi(3686) events collected with the BESIII detector at BEPCII, we study for the first time the decay chi(cJ) -> eta'K+K- (J = 1, 2), where eta' -> gamma rho(0) ...and eta' -> eta pi(+)pi(-). A partial wave analysis in the covariant tensor amplitude formalism is performed for the decay chi(c1) -> eta'K+K-. Intermediate processes chi(c1) -> eta'f(2)'(1525) chi(c1) -> K-0*(1430)K-+/-(-/+) (K-0*(1430)(+/-) -> eta'K-+/-) are observed with statistical significances larger than 5 sigma, and their branching fractions are measured.
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Based on 22.7 fb-1 of e+e- annihilation data collected at 33 different center-of-mass energies between 3.7730 and 4.7008 GeV with the BESIII detector at the BEPCII collider, Born cross sections of ...the two processes e+e- & RARR; & phi;K+K- and e+e- & RARR; & phi;K0SK0S are measured for the first time. No indication of resonant production through an intermediate vector state V is observed, and the upper limits on the product of the electronic width & UGamma;e+e- and the branching fraction Br(V & RARR; & phi;K over bar K) of the processes e+e- & RARR; V & RARR; & phi;K+K- and e+e- & RARR; V & RARR; & phi;K0SK0S at the 90% confidence level are obtained for a large parameter space in resonance masses and widths. For the current world average mass and width of the & psi;(4230) of m = 4.2187 GeV=c2 and & UGamma; = 44 MeV, we set upper limits on the & phi;K+K- and & phi;K0SK0S final states of 1.75 and 0.47 eV at the 90% confidence level, respectively.
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Using 2.93 fb–1 of e+e– collision data taken at a center-of-mass energy of 3.773 GeV by the BESIII detector at the BEPCII, we measure the branching fractions of the singly Cabibbo-suppressed decays D ...→ ωππ to be B(D0 → ωπ+ π–) = (1.33 ± 0.16 ± 0.12)×10–3 and B(D+ → ωπ+ π0) = ( 3.87 ± 0.83 ± 0.25 ) × 10–3, where the first uncertainties are statistical and the second ones systematic. The statistical significances are 12.9σ and 7.7σ, respectively. The precision of B(D0 → ωπ+ π–) is improved by a factor of 2.1 over prior measurements, and B(D+ → ωπ+ π0) is measured for the first time. No significant signal for D0 → ωπ0 π0 is observed, and the upper limit on the branching fraction is B(D0 → ωπ0 π0) < 1.10 × 10–3 at the 90% confidence level. The branching fractions of D → ηππ are also measured and consistent with existing results.
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Using a sample of 106 million $ψ(3686)$ decays, $ψ(3686)→γχ_{cJ}(J=0,1,2)$ and $ψ(3686)→γχ_{cJ},χ_{cJ}→γJ/ψ(J=1,2)$ events are utilized to study inclusive $χ_{cJ}→$ anything, $χ_{cJ}→$ hadrons, and ...$J/ψ→$ anything distributions, including distributions of the number of charged tracks, electromagnetic calorimeter showers, and $π^0s$, and to compare them with distributions obtained from the BESIII Monte Carlo simulation. Information from each Monte Carlo simulated decay event is used to construct matrices connecting the detected distributions to the input predetection “produced” distributions. Assuming these matrices also apply to data, they are used to predict the analogous produced distributions of the decay events. Using these, the charged particle multiplicities are compared with results from MARK I. Further, comparison of the distributions of the number of photons in data with those in Monte Carlo simulation indicates that G-parity conservation should be taken into consideration in the simulation.
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Using 2.93 fb −1 of e+e− annihilation data collected at a center-of-mass energy √s = 3.773 GeV with the BESIII detector operating at the BEPCII collider, we search for the semileptonic D0(+) decays ...into a b1(1235) − (0) axial-vector meson for the first time. No significant signal is observed for either charge combination. The upper limits on the product branching fractions are BD0 → b1(1235)−e+νe Bb1(1235)− → ωπ−< 1.12 × 10−4 and BD+ → b1(1235)0e+νe⋅ Bb1(1235)0 → ωπ0< 1.75 × 10−4 at the 90% confidence level.
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Using 2.93 fb−1 of e+e− collision data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, the first observation of the doubly Cabibbo-suppressed decay D+ → K+π+π−π0 is ...reported. After removing decays that contain narrow intermediate resonances, including D+ → K+η, D+ → K+ω, and D+ → K+ϕ, the branching fraction of the decay D+ → K+π+π−π0 is measured to be ( 1.13 ± 0.0 8stat ± 0.0 3syst) × 10−3. The ratio of branching fractions of D+ → K+π+π−π0 over D+ → K−π+π+π0 is found to be ( 1.81 ± 0.15 )%, which corresponds to ( 6.28 ± 0.52 ) tan4θC, where θC is the Cabibbo mixing angle. This ratio is significantly larger than the corresponding ratios for other doubly Cabibbo-suppressed decays. The asymmetry of the branching fractions of charge-conjugated decays D± → K±π±π∓π0 is also determined, and no evidence for C P violation is found. In addition, the first evidence for the D+ → K+ω decay, with a statistical significance of 3.3σ, is presented and the branching fraction is measured to be B (D+ → K+ω) = ( 5. 7−2.1 stat+2.5 ± 0.2syst ) × 10−5.
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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 .
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We present the first search for the leptonic decays D * + → e + ν e and D * + → μ + ν μ by analyzing a data sample of electron-positron collisions recorded with the BESIII detector at center-of-mass ...energies between 4.178 and 4.226 GeV, corresponding to an integrated luminosity of 6.32 fb − 1 . No significant signal is observed. The upper limits on the branching fractions for D * + → e + ν e and D * + → μ + ν μ are set to be 1.1 × 10 − 5 and 4.3 × 10 − 6 at 90% confidence level, respectively. Published by the American Physical Society 2024
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