377 research outputs found

    Search for the charmonium weak decays J/ψDsρ++c.c. J/\psi \to {D}_s^{-}{\rho}^{+}+\textrm{c}.\textrm{c}. and J/ψDsπ++c.c. J/\psi \to {D}_s^{-}{\pi}^{+}+\textrm{c}.\textrm{c}.

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    Based on (10087 ± 44) × 10 6 J / ψ events recorded with the BESIII detector, we search for the rare charmonium weak decays J/ψDsρ++c.c. J/\psi \to {D}_s^{-}{\rho}^{+}+\textrm{c}.\textrm{c}. and J/ψDsπ++c.c. J/\psi \to {D}_s^{-}{\pi}^{+}+\textrm{c}.\textrm{c}. No signal is observed, and upper limits on the branching fractions at the 90% confidence level are set as B(J/ψDsρ++c.c.)<8.0×107 \mathcal{B}\left(J/\psi \to {D}_s^{-}{\rho}^{+}+\textrm{c}.\textrm{c}.\right)<8.0\times {10}^{-7} and B(J/ψDsπ++c.c.)<4.1×107 \mathcal{B}\left(J/\psi \to {D}_s^{-}{\pi}^{+}+\textrm{c}.\textrm{c}.\right)<4.1\times {10}^{-7} . Our results provide the most stringent experimental constraints on these decays.LPHE-L

    Search for the rare decay J/ψ →γD0+ c. c. at BESIII

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    Using (10087±44)×106J/ψ events collected with the BESIII detector, we search for the rare decay J/ψ→γD0+c.c. for the first time. No significant signal is observed and the upper limit on the branching fraction is determined to be B(J/ψ→γD0+c.c.)&lt;9.1×10-8 at 90% confidence level. © 2024 authors. Published by the American Physical Society

    Observation of a Vector Charmoniumlike State at 4.7 GeV / c2c^2 and Search for ZcsZ_{cs} in e+eK+KJ/ψe^+ e^− → K^+ K^− J / ψ

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    Using data samples with an integrated luminosity of 5.85 fb(-1) collected at center-of-mass energies from 4.61 to 4.95 GeV with the BESIII detector operating at the BEPCII storage ring, we measure the cross section for the process e(+)e(-) -> K+ K- J/psi. A new resonance with a mass of M = 4708(-15)(+17) +/- 21 MeV/c(2) and a width of Gamma = 126(-23)(+27) +/-+/- 30 MeV is observed in the energy-dependent line shape of the e(+)e(-) -> K+ K- J/psi. cross section with a significance over 5 sigma. The K(+)J/psi system is also investigated to search for charged charmoniumlike states, but no significant Z(cs)(+) states are observed. Upper limits on the Born cross sections for e+e- -> K-Z(cs)(3985)(+)/K-Z(cs)(4000)(+) + c:c: with Z(cs)(3985)(+/-)/Z(cs)(4000)(+/-) -> K(+/-)J/psi are reported at 90% confidence levels. The ratio of branching fractions {[B(Z(cs)(3985)(+) -> K+J/psi)]/B[Z(cs)(3985)(+) -> ((D) over bar D-0(s)*(+) + (D) over bar*D-0(s)+)]} is measured to be less than 0.03 at 90% confidence level.LPH

    First measurement of ΛN\Lambda N inelastic scattering with Λ\Lambda from e+eJ/ψΛΛˉe^{+} e^{-} \rightarrow J/\psi \to \Lambda \bar{\Lambda}

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    Using an e+ee^+ e^- collision data sample of (10087±44)×106 J/ψ(10087 \pm 44)\times10^6 ~J/\psi events taken at the center-of-mass energy of 3.097 GeV3.097~\rm{GeV} by the BESIII detector at the BEPCII collider, the process Λ+NΣ++X\Lambda+N \rightarrow \Sigma^+ + X is studied for the first time employing a novel method. The Σ+\Sigma^{+} hyperons are produced by the collisions of Λ\Lambda hyperons from J/ψJ/\psi decays with nuclei in the material of the BESIII detector. The total cross section of Λ+9BeΣ++X\Lambda + ^{9}{\rm Be} \rightarrow \Sigma^+ + X is measured to be σ=(37.3±4.7±3.5) mb\sigma = (37.3 \pm 4.7 \pm 3.5)~{\rm mb} at Λ\Lambda beam momenta within [1.057,1.091] GeV/c[1.057, 1.091]~{\rm GeV}/c, where the uncertainties are statistical and systematic, respectively. This analysis is the first study of Λ\Lambda-nucleon interactions at an e+ee^+ e^- collider, providing information and constraints relevant for the strong-interaction potential, the origin of color confinement, the unified model for baryon-baryon interactions, and the internal structure of neutron stars

    Precision measurement of the branching fraction of J/ψ →k+K- via ψ (2S) →π+π-J/ψ

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    Using a sample of 448.1×106 ψ(2S) events collected with the BESIII detector, we perform a study of the decay J/ψ→K+K- via ψ(2S)→π+π-J/ψ. The branching fraction of J/ψ→K+K- is determined to be BK+K-=(3.072±0.023(stat)±0.050(syst))×10-4, which is consistent with previous measurements but with significantly improved precision

    Study of the decay J/ψ →φπ0η

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    Based on (10.09±0.04)×109 J/ψ events collected with the BESIII detector operating at the BEPCII collider, a partial wave analysis of the decay J/ψ→φπ0η is performed. We observe for the first time two new structures on the φη invariant mass distribution, with significances exceeding 27σ and 13σ; the first with JPC=1+-, mass M=(1908±6(stat) -4+8(sys)) MeV/c2, and width Γ=(175±13(stat) -16+7(sys)) MeV, the second with JPC=1 - , mass M=(1992±12(stat) -6+15(sys)) MeV/c2, and width Γ=(132±22(stat) -4+17(sys)) MeV. These measurements provide important input for the strangeonium spectrum. In addition, the f0(980)-a0(980)0 mixing signal in J/ψ→φf0(980)→φa0(980)0 and the corresponding electromagnetic decay J/ψ→φa0(980)0 are measured with improved precision, providing crucial information to understand the nature of a0(980)0 and f0(980)

    Determination of Spin-Parity Quantum Numbers of X (2370) as 0-+ from J/ψ →γ KS0 KS0 η′

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    Based on (10087±44)×10^{6} J/ψ events collected with the BESIII detector, a partial wave analysis of the decay J/ψ→γK_{S}^{0}K_{S}^{0}η^{'} is performed. The mass and width of the X(2370) are measured to be 2395±11(stat)_{-94}^{+26}(syst) MeV/c^{2} and 188_{-17}^{+18}(stat)_{-33}^{+124}(syst) MeV, respectively. The corresponding product branching fraction is B[J/ψ→γX(2370)]×B[X(2370)→f_{0}(980)η^{'}]×B[f_{0}(980)→K_{S}^{0}K_{S}^{0}]=(1.31±0.22(stat)_{-0.84}^{+2.85}(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

    Improved measurement of the branching fractions for J/ψ→γπ0, γη, and γη′

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    Using a data sample of (1.0087 pm 0.0044Þ ) 10^10 J/ψ events collected with the BESIII detector, the decays of J/ψ → γπ0(η; η') → γγγ are studied. Newly measured branching fractions are B(J/ψ → γπ0) = (3.34 pm 0.02 pm 0.09)× 10−5, B(J/ψ → γη) = (1.096 pm 0.01 pm 0.019) × 10−3, and B(J/ψ → γη') =(5.40 pm 0.01 pm 0.11) × 10−3, where the first uncertainties are statistical and the second are systematic. These results are consistent with the world average values within two standard deviations

    Search for X (1870) via the decay J/ψ →ωK+K-η

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    Using a sample of (10087±44)×106 J/ψ events collected by the BESIII detector at the BEPCII collider, we search for the decay X(1870)→K+K-η via the J/ψ→ωK+K-η process for the first time. No significant X(1870) signal is observed. The upper limit on the branching fraction of the decay J/ψ→ωX(1870)→ωK+K-η is determined to be 9.55×10-7 at the 90% confidence level. In addition, the branching faction B(J/ψ→ωK+K-η) is measured to be (3.33±0.02(stat)±0.12(syst))×10-4

    Search for hc →π+π-J/ψ via ψ(3686)→π0hc

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    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
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