Based on a sample of (2712.4 ± 14.3) × 106 ψ(3686) events collected with the BESIII detector, a partial wave analysis of the decay ψ (3686)→ΛΣ^0π^0 + c.c. is performed to investigate Λ* and Σ* resonances in the π^0Σ^0 and π0Λ invariant mass distributions. Significant contributions are found from the Λ(1405), Λ(1520), Λ(1600), Λ(1670), Λ(1690), Λ(1800), Λ(1890), Λ(2325), Σ(1385), Σ(1660), Σ(1670), Σ(1750), and Σ(1910). The masses, widths, and production branching fractions for each component are determined. In addition, the branching fraction of ψ (3686)→ΛΣ^0π^0 + c.c. is measured to be (1.544 ± 0.013 ± 0.071) × 10−4 for the first time, where the first uncertainty is statistical and the second systematic.

A bstract Based on 7.33 fb − 1 of e + e − collision data collected by the BESIII detector operating at the BEPCII collider at center-of-mass energies from 4.128 to 4.226 GeV, a search for the Majorana neutrino ν m is conducted in the lepton-number-violating decays of $$ {D}_{\textrm{s}}^{+} $$ D s + → h − h 0 e + e + . Here, h − represents a K − or π − , and h 0 represents a π 0 , $$ {K}_S^0 $$ K S 0 or ϕ . No significant signal is observed, and the upper limits of their branching fractions at the 90% confidence level are determined to be $$ \mathcal{B} $$ B ( $$ {D}_{\textrm{s}}^{+} $$ D s + → ϕπ − e + e + ) < 6 . 9 × 10 − 5 , $$ \mathcal{B} $$ B ( $$ {D}_{\textrm{s}}^{+} $$ D s + → ϕK − e + e + ) < 9 . 9 × 10 − 5 , $$ \mathcal{B} $$ B ( $$ {D}_{\textrm{s}}^{+} $$ D s + → $$ {K}_S^0 $$ K S 0 π − e + e + ) < 1 . 3 × 10 − 5 , $$ \mathcal{B} $$ B ( $$ {D}_{\textrm{s}}^{+} $$ D s + → $$ {K}_S^0 $$ K S 0 K − e + e + ) < 2 . 9 × 10 − 5 , $$ \mathcal{B} $$ B ( $$ {D}_{\textrm{s}}^{+} $$ D s + → π − π 0 e + e + ) < 2 . 9 × 10 − 5 and $$ \mathcal{B} $$ B ( $$ {D}_{\textrm{s}}^{+} $$ D s + → K − π 0 e + e + ) < 3 . 4 × 10 − 5 . The Majorana neutrino is searched for with different mass assumptions within the range [0 . 20 , 0 . 80] GeV /c 2 in the decay of $$ {D}_{\textrm{s}}^{+} $$ D s + → ϕe + ν m with ν m → π − e + , and the upper limits of the branching fractions at the 90% confidence level are at the level of 10 − 5 –10 − 2 , depending on the mass of the Majorana neutrino.

In today’s society, ancient cities, as important components of historical and cultural heritage and urban development, are receiving increasing attention for their protection, utilization, and management. This research mainly focuses on the construction of an evaluation system for the spatial historical evolution of ancient city streets and the corresponding management strategies. Through a comprehensive evaluation of the spatial issues and characteristics of the ancient city streets, a multi-dimensional evaluation system for the historical evolution of the ancient city space with a total of 13 indicator factors, including historicity, is constructed. Taking Suzhou Ancient City as an example for empirical analysis, five typical types of ancient city streets are identified. Finally, corresponding update strategies are proposed for different types, especially the utilization of biomaterials and the design of plant landscapes, providing more innovative and sustainable management suggestions for the revitalization planning of the ancient city.

Utilizing a dataset of 6.7 fb(-1) from electron-positron collisions recorded by the BESIII detector at the BEPCII storage ring, a search is conducted for the processes e(+)e(-) -> phi chi(c0) and phi eta(c2)(1D) across centerof-mass energies from 4.47 to 4.95 GeV. In the absence of any significant signals, upper limits are set. These include limits on the dressed cross sections for e(+)e(-) -> phi chi(c0), as well as the product of the dressed cross section for e(+)e(-) -> phi eta(c2)(1D) and a sum of five branching fractions. Furthermore, the product of the electronic width of Y(4660) and the branching fraction of the Y(4660) ->phi chi(c0), denoted as Gamma Y-e+e-((4660)) B-Y(4660)->phi chi(c0), is determined to be <0.35 eV at the 90% confidence level.

The energy-dependent cross section for e(+)e(-) -> eta psi(2S) is measured at 18 center of mass energies from 4.288 to 4.951 GeV using the BESIII detector. Using the same data samples, we also perform the first search for the reaction e(+)e(-) -> eta(X) over tilde(3872), but no evidence is found for the (X) over tilde(3872) in the pi(+)pi(-) J/psi. mass distribution. At each of the 18 center of mass energies, upper limits at the 90% confidence level on the cross section for e(+)e(-) -> eta psi(2S) and on the product of the e(+)e(-) -> eta(X) over tilde(3872) cross section with the branching fraction of (X) over tilde(3872) -> pi(+)pi(-)J/psi are reported.

Using a data sample corresponding to an integrated luminosity of 10.9 fb(-1) collected at center-of-mass energies from 4.16 to 4.34 GeV with the BESIII detector, we search for the decay chi(c1) (3872) -> pi(+)pi(-)chi(c1) in the radiative production e(+)e(-) -> gamma chi(c1) (3872). No significant signal is observed, and the ratio for the branching fraction of chi(c1) (3872) -> pi(+)pi(-)chi(c1) to chi(c1) (3872) -> pi(+)pi(-)J/psi is measured as R equivalent to B[chi(c1)(3872)->pi(+)pi(-)chi(c1)]/B[chi(c1)(3872)->pi(+)pi(-)J/psi] < 0.18 at 90% confidence level. An upper limit on the product of the cross section sigma[e(+)e(-) -> gamma chi(c1) (3872)] and the branching fraction B[chi(c1)(3872)->pi(+)pi(-)chi(c1)] at each center-of-mass energy is also given. These measurements favor the nonconventional charmonium nature of the chi(c1)(3872) state.

Using e+e− collision data collected by the BESIII detector at BEPCII corresponding to an integrated luminosity of 30 fb−1, we measure Born cross sections and effective form factors for the process e^+e^-→Ξ^0Ξ^0 at forty-five center-of-mass energies between 3.51 and 4.95 GeV. The dressed cross section is fitted, assuming a power-law function plus a charmonium(-like) state, i.e., ψ(3770), ψ(4040), ψ(4160), ψ(4230), ψ(4360), ψ(4415) or ψ(4660). No significant charmonium(-like) state decaying into Ξ^0Ξ^0 is observed. Upper limits at the 90 e^+e^-→Ξ^0Ξ^0 and e^+e^-→Ξ^-Ξ^+ are also presented to test isospin symmetry and the vector meson dominance model.

Using e+e− collision data, corresponding to an integrated luminosity of 892 pb−1 collected at center-of-mass energies from 4.84 to 4.95 GeV with the BESIII detector, we search for the process e+e−→K+K−ψ(3770) by reconstructing two charged kaons and one D meson from ψ(3770). No significant signal of e+e−→K+K−ψ(3770) is found and the upper limits of the Born cross sections are reported at 90% confidence level. Published by the American Physical Society 2024

The absolute branching fraction of the decay Lambda(c)(2625)(+) -> Lambda(+)(c)pi(+)pi(-) is measured for the first time to be (50.2 +/- 5.7(stat) +/- 3.5(syst))% with 368.48 pb(-1) of e(+)e(-) collision data collected by the BESIII detector at the center-of-mass energies of root s = 4.918 and 4.950 GeV. Although the central value of the result is lower than the theoretical prediction of 67%, obtained from isospin symmetry, they are consistent taking the uncertainties into account. This is the first absolute branching fraction measurement for Lambda(c)(2625)(+) since it was found. This measurement is necessary to obtain the coupling constants for the transitions between s-wave and p-wave charmed baryons in heavy hadron chiral perturbation theory. In addition, we search for the decay Lambda(c)(2595)(+) -> Lambda(+)(c)pi(+)pi(-). No significant signal is observed, and the upper limit on its branching fraction is determined to be 85.0% at the 90% confidence level.

The energy-dependent cross section for e+e−→ηψ(2S) is measured at 18 center of mass energies from 4.288 to 4.951 GeV using the BESIII detector. Using the same data samples, we also perform the first search for the reaction e+e−→ηX˜(3872), but no evidence is found for the X˜(3872) in the π+π−J/ψ mass distribution. At each of the 18 center of mass energies, upper limits at the 90% confidence level on the cross section for e+e−→ηψ(2S) and on the product of the e+e−→ηX˜(3872) cross section with the branching fraction of X˜(3872)→π+π−J/ψ are reported. Published by the American Physical Society 2024

We report a measurement of decay-time-dependent charge-parity (CP) asymmetries in B0→KS0KS0KS0 decays. We use 387×106 BB¯ pairs collected at the ϒ(4S) resonance with the Belle II detector at the SuperKEKB asymmetric-energy electron-positron collider. We reconstruct 220 signal events and extract the CP-violating parameters S and C from a fit to the distribution of the decay-time difference between the two B mesons. The resulting confidence region is consistent with previous measurements in B0→KS0KS0KS0 and B0→(cc¯)K0 decays and with predictions based on the standard model. Published by the American Physical Society 2024

Based on (2712.4 +/- 14.1) x 10(6) psi(2S) events, 7.9 fb(-1) psi(3773) data, and 0.8 fb(-1) off-resonance data samples collected with the BESIII detector, we measure the branching fraction of psi(2S) -> gamma pi(0) and e(+)e(-) -> gamma pi(0) form factor at momentum transfers Q(2) similar to 13 GeV2. The e(+)e(-) -> gamma pi(0) cross section is fitted with considering the interference between the psi(2S) and continuum amplitudes and two solutions are found, B = 3.74 x 10(-7) with phi = 3.93 rad and B = 7.87 x 10(-7) with phi = 2.08 rad. Here, B is the branching fraction of psi(2S) -> gamma pi(0) and phi is the relative phase angle between the psi(2S) and continuum amplitudes. Due to insufficient off-resonance data, the branching fraction B(psi(2S)-> gamma pi(0)) is determined to be in the range [2.7, 9.7] x 10(-7) within 1 standard deviation of the contour region.

Using e(+)e(-) collision data collected with the BESIII detector operating at the BEPCII collider, the Born cross sections of e(+)e(-) -> Lambda(+)(c)(Lambda) over bar (c)(2595)(-) + c.c. and e(+)e(-) -> Lambda(+)(c)(Lambda) over bar (c)(2625)(-) + c.c. are measured for the first time at center-of-mass energies of root s = 4918.0 and 4950.9 MeV. Nonzero cross sections are observed very close to the production threshold. The measured Born cross sections of e(+)e(-) -> Lambda(+)(c)(Lambda) over bar (c)(2625)(-) + c.c. are about 2-3 times greater than those of e(+)e(-) -> Lambda(+)(c)(Lambda) over bar (c)(2595)(-) + c.c., providing the similar behavior as semileptonic decays of Lambda(0)(b), but different behavior from that in the hadronic decays of Lambda(0)(b). The Born cross sections are 15.6 +/- 3.1 +/- 0.9 pb and 29.4 +/- 3.7 +/- 2.7 pb for e(+)e(-) -> Lambda(+)(c)(Lambda) over bar (c)(2595)(-) + c.c., and are 43.4 +/- 4.0 +/- 4.1 pb and 76.8 +/- 6.5 +/- 4.2 pb for e(+)e(-) -> Lambda(+)(c)(Lambda) over bar (c)(2625)(-) + c.c. at root s = 4918.0 and 4950.9 MeV, respectively. Based on the polar angle distributions of the (Lambda) over bar (c)(2625)(-) and Lambda(c)(2625)(-), the form-factor ratios root|G(E)|(2) + 3|G(M)|(2)/|G(C)| are determined for e(+)e(-) -> Lambda(+)(c)(Lambda) over bar (c)(2625)(-) + c.c. for the first time, which are 5.95 +/- 4.07 +/- 0.15 and 0.94 +/- 0.32 +/- 0.02 at root s = 4918.0 and 4950.9 MeV, respectively. All of these first uncertainties are statistical and second systematic.

Based on a sample of (448.1 +/- 2.9) x 10(6) psi(3686) events collected with the BESIII detector at BEPCII, the decays of psi(3686) -> K-Lambda(Xi) over bar (+) + c.c. with (Xi) over bar -> (Lambda) over bar pi(+), (Lambda) over bar -> (p) over bar pi(+) pthorn are studied. We investigate the two excited resonances, Xi(1690)(-) and Xi(1820)(-), which are each observed with large significance (>> 10 sigma) in the K-Lambda invariant mass distributions. A partial wave analysis is performed, and the spin-parities of Xi(1690)(-) and Xi(1820)(-) are measured to be 1/2(-) and 3/2(-), respectively. The masses, widths, and product branching fractions of Xi(1690)(-) and Xi(1820) are also measured.

We report the measurement of the inclusive cross sections for e+e−→nOCH (where nOCH denotes non-open charm hadrons) with improved precision at center-of-mass (c.m.) energies from 3.645 to 3.871 GeV. We observe three resonances: R(3760), R(3780), and R(3810) with significances of 8.1σ, 13.7σ, and 8.8σ, respectively. The R(3810) state is observed for the first time, while the R(3760) and R(3780) states are observed for the first time in the nOCH cross sections. Two sets of resonance parameters describe the energy-dependent line shape of the cross sections well. In set I [set II], the R(3810) state has mass (3805.7±1.1±2.7) [(3805.7±1.1±2.7)] MeV/c2, total width (11.6±2.9±1.9) [(11.5±2.8±1.9)] MeV, and an electronic width multiplied by the nOCH decay branching fraction of (10.9±3.8±2.5) [(11.0±3.4±2.5)] eV. In addition, we measure the branching fractions B[R(3760)→nOCH]=(25.2±16.1±30.4)%[(6.4±4.8±7.7)%] and B[R(3780)→nOCH]=(12.3±6.6±8.3)%[(10.4±4.8±7.0)%] for the first time. The R(3760) state can be interpreted as an open-charm (OC) molecular state, but containing a simple four-quark state component. The R(3810) state can be interpreted as a hadrocharmonium state. Published by the American Physical Society 2024

Using e(+)e(-) collision data corresponding to an integrated luminosity of 7.33 fb(-1) recorded by the BESIII detector at center-of-mass energies between 4.128 and 4.226 GeV, we present an analysis of the decay D-s(+) -> pi(+)pi(-)e(+)nu(e), where the D-s(+) is produced via the process e(+)e(-) -> D-s*(+/-) D-s(-/+). We observe the f(0) (980) in the pi(+)pi(-) system and the branching fraction of the decay D-s(+) -> f(0) (980)e(+)nu(e) with f(0)(980) -> pi(+)pi(-) measured to be (1.72 +/- 0.13(stat) +/- 0.10(syst)) x 10(-3), where the uncertainties are statistical and systematic, respectively. The dynamics of the D-s(+) -> f(0)(980)e(+)nu(e) decay are studied with the simple pole parametrization of the hadronic form factor and the Flatte formula describing the f(0)(980) in the differential decay rate, and the product of the form factor f(+)(f0)(0) and the c -> s Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-cs vertical bar is determined for the first time to be f+f0(0)vertical bar V-cs vertical bar = 0.504 +/- 0.017(stat) +/- 0.035(syst). Furthermore, the decay D-s(+) -> f(0)(500)e(+)nu(e) is searched for the first time but no signal is found. The upper limit on the branching fraction of D-s(+) -> f(0)(500)e(+)nu(e), f(0)(500) -> pi(+)pi(-) decay is set to be 3.3 x 10(-4) at 90% confidence level.

Using 7.33  fb^{-1} of e^{+}e^{-} collision data collected by the BESIII detector at center-of-mass energies in the range of sqrt[s]=4.128-4.226  GeV, we search for the rare decays D_{s}^{+}→h^{+}(h^{0})e^{+}e^{-}, where h represents a kaon or pion. By requiring the e^{+}e^{-} invariant mass to be consistent with a ϕ(1020), 0.98<M(e^{+}e^{-})<1.04  GeV/c^{2}, the decay D_{s}^{+}→π^{+}ϕ, ϕ→e^{+}e^{-} is observed with a statistical significance of 7.8σ, and evidence for the decay D_{s}^{+}→ρ^{+}ϕ, ϕ→e^{+}e^{-} is found for the first time with a statistical significance of 4.4σ. The decay branching fractions are measured to be B(D_{s}^{+}→π^{+}ϕ,ϕ→e^{+}e^{-})=(1.17_{-0.21}^{+0.23}±0.03)×10^{-5}, and B(D_{s}^{+}→ρ^{+}ϕ,ϕ→e^{+}e^{-})=(2.44_{-0.62}^{+0.67}±0.16)×10^{-5}, where the first uncertainties are statistical and the second systematic. No significant signals for the three four-body decays of D_{s}^{+}→π^{+}π^{0}e^{+}e^{-}, D_{s}^{+}→K^{+}π^{0}e^{+}e^{-}, and D_{s}^{+}→K_{S}^{0}π^{+}e^{+}e^{-} are observed. For D_{s}^{+}→π^{+}π^{0}e^{+}e^{-}, the ϕ mass region is vetoed to minimize the long-distance effects. The 90% confidence level upper limits set on the branching fractions of these decays are in the range of (7.0-8.1)×10^{-5}.

Using data samples collected with the BESIII detector operating at the BEPCII storage ring, the cross section of the inclusive process e+e−→η+X, normalized by the total cross section of e+e−→hadrons, is measured at eight center-of-mass energy points from 2.0000 to 3.6710 GeV. These are the first measurements with momentum dependence in this energy region. Our measurement shows a significant discrepancy compared to the existing fragmentation functions. To address this discrepancy, a new QCD analysis is performed at the next-to-next-to-leading order with hadron mass corrections and higher twist effects, which can explain both the established high-energy data and our measurements reasonably well. Published by the American Physical Society 2024

Using e+e− annihilation data sets corresponding to an integrated luminosity of 4.5 fb−1, collected with the BESIII detector at center-of-mass energies between 4.600 and 4.699 GeV, we report the first measurements of the absolute branching fractions ℬ(Λ_c^+→ pK_L^0) = (1.67 ± 0.06 ± 0.04) ℬ(Λ_c^+→ pK_L^0π^+π^-) = (1.69 ± 0.10 ± 0.05) ℬ(Λ_c^+→ pK_L^0π^0) = (2.02 ± 0.13 ± 0.05) Λ_c^+→ pK_S^0 , Λ_c^+→ pK_S^0π^+π^- , and Λ_c^+→ pK_S^0π^0 , we present the first measurements of the K_S^0 - K_L^0 asymmetries R(Λ_c^+,K_S,L^0X)=ℬ(Λ_c^+→K_S^0X)-ℬ(Λ_c^+→K_L^0X)/ℬ(Λ_c^+→K_S^0X)+ℬ(Λ_c^+→K_L^0X) in charmed baryon decays: R(Λ_c^+,pK_S,L^0)=-0.025± 0.031 , R(Λ_c^+,pK_S,L^0π^+π^-)=-0.027± 0.048 and R(Λ_c^+,pK_S,L^0π^0)=-0.015± 0.046 . No significant asymmetries with statistical significance are observed.

The branching fraction of D^+→K_S^0π^0e^+ν_e is measured for the first time using 7.93 fb−1 of e+e− annihilation data collected at the center-of-mass energy √(s) = 3.773 GeV with the BESIII detector operating at the BEPCII collider, and is determined to be ℬ(D^+→K_S^0π^0e^+ν_e)=(0.881±0.017_stat.±0.016_syst.)% . Based on an analysis of the D^+→K_S^0π^0e^+ν_e decay dynamics, we observe the S-wave and P-wave components with fractions of fS-wave = (6.13 ± 0.27stat. ± 0.30syst.) f_K^∗(892)^0=(93.88±0.27_stat.±0.29_syst.)% , respectively. From these results, we obtain the branching fractions ℬ(D^+→(K_S^0π^0)_S-wavee^+ν_e)=(5.41±0.35_stat.±0.37_syst.)×10^-4 and ℬ(D^+→K^∗(892)^0e^+ν_e)=(4.97±0.11_stat.±0.12_syst.)% . In addition, the hadronic form-factor ratios of D^+→K^∗(892)^0e^+ν_e at q2 = 0, assuming a single-pole dominance parameterization, are determined to be r_V=V(0)/A_1(0)=1.43±0.07_stat.±0.03_syst. and r_2=A_2(0)/A_1(0)=0.72±0.06_stat.±0.02_syst. .