In this study, a novel lead‐free high‐entropy ceramic (HEC) system, (Bi0.2Na0.2Ca0.2Ba0.2Sr0.2)(1–3x/2)LaxTiO3 (0 ≤ x ≤ 0.15) (abbreviated as BNCBST‐xLa), was designed to enhance energy storage performance through La substitution and prepared via a hydrothermal method. Results indicate that La doping at A site in BNCBST induces lattice distortion and further improves dielectric relaxation. Moreover, grain growth is inhibited by the La content, which results in an increase in the insulation resistance and thus significant enhancement in the electric breakdown strength (Eb). Accordingly, the system with x = 0.03 exhibits an excellent recoverable energy density (Wrec) of 2.43 J/cm3 and a high energy storage efficiency (η) of 85.5% under a great Eb of 245 kV/cm, together with wide temperature stability (Wrec and η vary within ± 8.3% and ± 1.1% at 30–150°C). The findings of this study suggest that the obtained La‐modified BNBCST HECs are promising for energy storage applications.

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Based on a sample of 4.4 fb −1 of e + e − annihilation data collected in the energy region between 4.6 GeV and 4.7 GeV with the BESIII detector at BEPCII, two singly Cabibbo-suppressed decays) is measured to be 0.0361 ± 0.0073(stat.) ± 0.0005(syst.), and the ratio of) is measured to be 0.0106 ± 0.0031(stat.) ± 0.0004(syst.). After taking the world-average branching fractions of the reference decay channels, the branching fractions B(Λ + c → Σ 0 K + ) and B(Λ + c → Σ + K 0 S ) are determined to be (4.7±0.9(stat.)± 0.1(syst.) ± 0.3(ref.)) × 10 −4 and (4.8 ± 1.4(stat.) ± 0.2(syst.) ± 0.3(ref.)) × 10 −4 , respectively. The branching fraction of the Λ + c → Σ + K 0 S decay is measured for the first time.

Based on e + e − collision samples corresponding to an integrated luminosity of 4.4 fb −1 collected with the BESIII detector at center-of-mass energies between 4.6 GeV and 4.7 GeV, a partial wave analysis of the charmed baryon hadronic decay Λ + c → Λπ + π 0 is performed, and the decays Λ + c → Λρ(770) + and Λ + c → Σ(1385)π are studied for the first time. Making use of the world-average branching fraction B(Λ + c → Λπ + π 0 ), their branching fractions are determined to bewhere the first uncertainties are statistical, the second are systematic, and the third are from the uncertainties of the branching fractions B(Λ + c → Λπ + π 0 ) and B(Σ(1385) → Λπ). In addition, amplitudes determined from the partial wave analysis, the decay asymmetry parameters are measured to be α Λρ(770) + = −0.763 ± 0.053 ± 0.039, α Σ(1385) + π 0 = −0.917 ± 0.069 ± 0.046, and α Σ(1385) 0 π + = −0.789 ± 0.098 ± 0.056.Keywords: e + e − collision, Charmed baryon hadronic decay, Partial wave analysis ArXiv ePrint: 00000.00000 Contents 1 Introduction 1 2 BESIII experiment and Monte Carlo simulation 3 3 Event selection 5 4 Partial wave analysis 6 4.1 Helicity angle definitions 8 4.2 Helicity amplitude 10 4.3 Likelihood function construction and fit fraction 12 4.4 Nominal fit results 13 4.5 Decay asymmetry parameters 13 5 Systematic uncertainties 19 6 Summary 21The BESIII collaboration 27 [7] LHCb Collaboration, Precision measurement of the Λ + c , Ξ + c , and Ξ 0 c baryon lifetimes, Phys. Rev. D 100 (2019) 032001.[8] LHCb Collaboration, Measurement of the lifetimes of promptly produced Ω 0