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Using a data sample of e+e− collision data corresponding to an integrated luminosity of 2.93 fb−1 collected with the BESIII detector at a center-of-mass energy of s=3.773GeV, we search for the singly Cabibbo-suppressed decays D0→π0π0π0, π0π0η, π0ηη and ηηη using the double tag method. The absolute branching fractions are measured to be B(D0→π0π0π0)=(2.0±0.4±0.3)×10−4, B(D0→π0π0η)=(3.8±1.1±0.7)×10−4 and B(D0→π0ηη)=(7.3±1.6±1.5)×10−4 with the statistical significances of 4.8σ, 3.8σ and 5.5σ, respectively, where the first uncertainties are statistical and the second ones systematic. No significant signal of D0→ηηη is found, and the upper limit on its decay branching fraction is set to be B(D0→ηηη)<1.3×10−4 at the 90% confidence level.
We report the first multi-differential measurements of strange hadrons of K −, φ and − yields as well as the ratios of φ/K − and φ/− in Au+Au collisions at √sNN = 3 GeV with the STAR experiment fixed target configuration at RHIC. The φ mesons and − hyperons are measured through hadronic decay channels, φ → K + K − and Ξ− → Λπ−. Collision centrality and rapidity dependence of the transverse momentum spectra for these strange hadrons are presented. The 4π yields and ratios are compared to thermal model and hadronic transport model predictions. At this collision energy, thermal model with grand canonical ensemble (GCE) under-predicts the φ/K − and φ/− ratios while the result of canonical ensemble (CE) calculations reproduce φ/K −, with the correlation length rc ∼ 2.7 fm, and φ/−, rc ∼ 4.2 fm, for the 0-10% central collisions. Hadronic transport models including high mass resonance decays could also describe the ratios. While thermal calculations with GCE work well for strangeness production in high energy collisions, the change to CE at 3 GeV implies a rather different medium property at high baryon density.
The baryonic decay D+s→pn¯ is observed, and the corresponding branching fraction is measured to be (1.21±0.10±0.05)×10−3, where the first uncertainty is statistical and second systematic. The data sample used in this analysis was collected with the BESIII detector operating at the BEPCII e+e− double-ring collider with a center-of-mass energy of 4.178~GeV and an integrated luminosity of 3.19~fb−1. The result confirms the previous measurement by the CLEO Collaboration and is of greatly improved precision, which may deepen our understanding of the dynamical enhancement of the W-annihilation topology in the charmed meson decays.
Using a sample of 1.31×109 J/ψ events collected by the BESIII detector at BEPCII during 2009 and 2012, we study the J/ψ→ωη′π+π− hadronic process. For the first time, we measure the branching ratio B(J/ψ→ωη′π+π−)=(1.12±0.02±0.13)×10−3. We search for the X(1835) state in the η′π+π− invariant mass spectra. No evidence is found and we estimate the upper limit on the branching fraction at 90% confidence level to be B(J/ψ→ωX(1835),X(1835)→η′π+π−)<6.2×10−5.
The cross sections of the process e+e−→K0SK0L are measured at fifteen center-of-mass energies s√ from 2.00 to 3.08 GeV with the BESIII detector at the Beijing Electron Positron Collider (BEPCII). The results are found to be consistent with those obtained by BaBar. A resonant structure around 2.2 GeV is observed, with a mass and width of 2273.7±5.7±19.3 MeV/c2 and 86±44±51 MeV, respectively, where the first uncertainties are statistical and the second ones are systematic. The product of its radiative width (Γe+e−) with its branching fraction to K0SK0L (BrK0SK0L) is 0.9±0.6±0.7 eV.
Based on 14.7 fb−1 of e+e− annihilation data collected with the BESIII detector at the BEPCII collider at 17 different center-of-mass energies between 3.7730 GeV and 4.5995 GeV, Born cross sections of the two processes e+e−→pp¯η and e+e−→pp¯ω are measured for the first time. No indication of resonant production through a vector state V is observed, and upper limits on the Born cross sections of e+e−→V→pp¯η and e+e−→V→pp¯ω at the 90% confidence level are calculated for a large parameter space in resonance masses and widths. For the current world average parameters of the ψ(4230) of m=4.2187 GeV/c2 and Γ=44 MeV, we find upper limits on resonant production of the pp¯η and pp¯ω final states of 7.5 pb and 10.4 pb at the 90% CL, respectively.
Several intermediate states of the reaction channels 𝑒+𝑒−→𝜋+𝜋−𝐷0¯𝐷0 and 𝑒+𝑒−→𝜋+𝜋−𝐷+𝐷− are studied using the data samples collected with the BESIII detector at center-of-mass energies above 4.08 GeV. For the first time in this final state, a 𝜓(3770) signal is seen in the 𝐷¯𝐷 invariant mass spectrum, with a statistical significance of 5.2𝜎 at √𝑠=4.42 GeV. There is also evidence for this resonance at √𝑠=4.26 and 4.36 GeV with statistical significance of 3.2𝜎 and 3.3𝜎, respectively. In addition, the Born cross section of 𝑒+𝑒−→𝜋+𝜋−𝜓(3770) is measured. The proposed heavy-quark-spin-symmetry partner of the 𝑋(3872), the state 𝑋2(4013), is also searched for in the 𝐷¯𝐷 invariant mass spectra. No obvious signal is found. The upper limit of the Born cross section of the process 𝑒+𝑒−→𝜌0𝑋2(4013) combined with the branching fraction is measured. Also, the processes 𝑒+𝑒−→𝐷1(2420)¯𝐷+c.c. are investigated. The neutral mode with 𝐷1(2420)0→𝐷0𝜋+𝜋− is reported with statistical significance of 7.4𝜎 at √𝑠=4.42 GeV for the first time, and evidence with statistical significance of 3.2𝜎 and 3.3𝜎 at √𝑠=4.36 and 4.60 GeV is seen, respectively. No evident signal for the process 𝑒+𝑒−→𝐷1(2420)0¯𝐷0+c.c.,𝐷1(2420)0→𝐷*+𝜋− is reported. Evidence for 𝑒+𝑒−→𝐷1(2420)+𝐷−+c.c.,𝐷1(2420)+→𝐷+𝜋+𝜋− is reported with statistical significance of 3.1𝜎 and 3.0𝜎 at √𝑠=4.36 and 4.42 GeV, respectively.
In Ref. [1] the BESIII collaboration published a cross section measurement of the process e+e− → π+π− in the energy range between 600 and 900 MeV. In this corrigendum, we report a corrected evaluation of the statistical errors in terms of a fully propagated covariance matrix. The correction also yields a reduced statistical uncertainty for the hadronic vacuum polarization contribution to the anomalous magnetic moment of the muon, which now reads as aππ,LO μ (600 − 900 MeV) = (368.2 ± 1.5stat ± 3.3syst) × 10−10. The central values of the cross section measurement and of aππ,LO μ , as well as the systematic uncertainties remain unchanged.
The SU(3)-flavor violating decay J/ψ→Ξ(1530)−Ξ¯++c.c. is studied using (1310.6±7.0)×106 J/ψ events collected with the BESIII detector at BEPCII and the branching fraction is measured to be B(J/ψ→Ξ(1530)−Ξ¯++c.c.) = (3.17±0.02stat.±0.08syst.)×10−4. This is consistent with previous measurements with an improved precision. The angular parameter for this decay is measured for the first time and is found to be α=−0.21±0.04stat.±0.06syst.. In addition, we report evidence for the radiative decay Ξ(1530)−→γΞ− with a significance of 3.9σ, including the systematic uncertainties. The 90\% confidence level upper limit on the branching fraction is determined to be B(Ξ(1530)−→γΞ−)≤3.7\%.
Elliptic flow measurements from two-, four- and six-particle correlations are used to investigate flow fluctuations in collisions of U+U at sNN−−−√ = 193 GeV, Cu+Au at sNN−−−√ = 200 GeV and Au+Au spanning the range sNN−−−√ = 11.5 - 200 GeV. The measurements show a strong dependence of the flow fluctuations on collision centrality, a modest dependence on system size, and very little if any, dependence on particle species and beam energy. The results, when compared to similar LHC measurements, viscous hydrodynamic calculations, and Glauber model eccentricities, indicate that initial-state-driven fluctuations predominate the flow fluctuations generated in the collisions studied.