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(-) -> (KSKL0)-K-0 pi(0). The results allow the Born cross sections of the process e(+)e(-) -> (KSKL0)-K-0 pi(0), as well as its subprocesses e(+)e(-) -> K*(892)K-0(0) over bar and K-2*(1430)K-0(0) to be measured. The Born cross sections for e(+)e(-) -> (KSKL0)-K-0 pi(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)K-0(0) is consistent with a vector meson state around 2.2 GeV with a significance of 3.2 sigma. A Breit-Wigner fit determines its mass as M-Y = (2164.7 +/- 9.1 +/- 3.1) MeV/c(2) and its width as Gamma(Y) = (32.4 +/- 21.0 +/- 1.8) MeV.
Using (10087 ± 44) x 10 6 J/ψ events collected with the BESIII detector at the BEPCII e + e - storage ring at the center-of-mass energy of √s = 3.097 GeV, we present a search for the rare semi-muonic ...charmonium decay J/ψ → D - μ + ν μ + c.c.. Since no significant signal is observed, we set an upper limit of the branching fraction to be B(J/ψ → D - μ + ν μ + c.c.) < 5.6 x 10 -7 at 90% confidence level. This is the first search for the weak decay of charmonium with a muon in the final state.
Using (27.12 ± 0.14) x 10 8 ψ(3686) events collected with the BESIII detector at BEPCII, the decay of ψ(3686) → Ω - K + Ξ 0 <over bar> + c.c. is observed for the first time. The branching ...fraction of this decay is measured to be B ψ(3686) → Ω - K + Ξ 0 <over bar> + c.c. = (2.78 ± 0.40 ± 0.18) x 10 -6 , where the first uncertainty is statistical and the second is systematic. Possible baryon excited states are searched for in this decay, but no evident intermediate state is observed with the current sample size.
We search for the semi-leptonic decays ?(+)(c) ? ?p(+)p(-)e(+)?(e) and ?(+)(c)? pK(S)(0)p(-)e(+)?(e) 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(?(+)(c) ? ?p(+)p(-)e(+)?(e)) < 3.9 x 10(-4) and B(?(+)(c)? pK(S)(0)p(-)e(+)?(e)) < 3.3 x10(-4) at the 90% confidence level, respectively.(C) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons .org /licenses /by /4 .0/). Funded by SCOAP3.
Using data samples with an integrated luminosity of 6.4 fb(-1) collected by the BESIII detector operating at the BEPCII storage ring, the process of e+e- gamma phi J/psi is studied. The processes of ...e(+)e(-) -> phi chi c1,c2, chi c1,c2 gamma J/psi are observed with a significance of more than 10 sigma. The ,Vs-dependent cross section of e(+)e(-) -> phi chi(c1,c2) is measured between 4.600 and 4.951 GeV, and evidence of a resonance structure is found for the first time in the phi chi(c2) process. We also search for the processes of e+e- -> gamma X(4140), gamma X(4274) and gamma X(4500) via the gamma phi J/psi final state, but no obvious structures are found. The upper limits on the production cross section times the branching fraction for these processes at the 90% confidence level are reported.
Using e(+)e(-) collision datasets corresponding to a total integrated luminosity of 21.7 fb(-1) collected with the BESIII detector at the BEPCII collider at center-of-mass energies ranging from 4.009 ...GeV to 4.951 GeV, the energy-dependent cross sections of e(+)e-->-Lambda<overline>+. are measured for the first time. By fitting these energy-dependent cross sections, we search for the excited psi states psi(4160) and psi(4415), and the vector charmonium-like states psi(4230), psi(4360), and psi(4660). No evidence for these is observed and the upper limits on the branching fractions of these states decaying into -Lambda+.. are set at the 90% confidence level.
Using 2.93 fb − 1 of e + e − collision data collected with the BESIII detector at the center-of-mass energy 3.773 GeV, we perform the first amplitude analysis of the decay D + → π + π 0 π 0 and ...determine the relative magnitudes and phases of different intermediate processes. The absolute branching fraction of D + → π + π 0 π 0 is measured to be (2.888 ± 0.058 stat . ± 0.069 syst . )%. The dominant intermediate processes are D + → a 1 (1260) + ( → ρ + π 0 ) and D + → *0 ρ + , with branching fractions of (8.66 ± 1.04 stat . ± 1.39 syst . ) × 10 − 3 and (9.70 ± 0.81 stat . ± 0.53 syst . ) × 10 − 3 , respectively.
Utilizing 7.33 fb(-1) of e(+)e(-) collision data taken at the center-of-mass energies of 4.128, 4.157, 4.178, 4.189, 4.199, 4.209, 4.219, and 4.226 GeV with the BESIII detector, the branching ...fraction of the leptonic decay D+s+ -> tau(+)nu(tau) via tau(+) -> mu(+)nu(mu )is measured to be BD+s ->tau+nu tau = (5.37 +/- 0.17(stat) +/- 0.15(syst))%. Combining this branching fraction with the world averages of the measurements of the masses of tau(+) and D-s(+) as well as the lifetime of D-s(+) , we extract the product of the decay constant of D-s(+) and the c -> s Cabibbo-Kobayashi-Maskawa matrix element to be D- f(s)+ |V-cs| = (246.7 +/- 3.9(stat) +/- 3.6(syst)) MeV. Taking |V-cs| from a global fit in the standard model we obtain fD+s = (253.4 +/- 4.0(stat) +/- 3.7(syst)) MeV. Conversely, taking( f)D(s)(+) from lattice quantum chromodynamics calculations, we obtain |V-cs| = 0.987 +/- 0.016(stat) +/- 0.014(syst).
The D + s → K + K − μ + ν μ decay is studied based on 7.33 fb −1 of e + e − collision data collected with the BESIII detector at center-of-mass energies in the range from 4.128 to 4.226 GeV. The ...absolute branching fraction is measured as B (D + s → ϕμ + ν μ ) = (2.25 ± 0.09 ± 0.07) × 10 −2 , the most precise measurement to date. Combining with the world average of B (D + s → ϕe + ν e ), the ratio of the branching fractions obtained is B (D + s → ϕμ + ν μ ) / B(D + s → ϕe + ν e ) = 0.94 ± 0.08, in agreement with lepton universality. By performing a partial wave analysis, the hadronic form factor ratios at q 2 = 0 are extracted, finding r V = V (0) / A 1 (0) = 1.58 ± 0.17 ± 0.02 and r 2 = A 2 (0) / A 1 (0) = 0.71 ± 0.14 ± 0.02, where the first uncertainties are statistical and the second are systematic. No significant S-wave contribution from f 0 (980) → K + K − is found. The upper limit B (D + s → f 0 (980)μ + ν μ ) · B ( f 0 (980) → K + K − ) < 5.45 × 10 −4 is set at 90% credibility level.
PDF
