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The dipole strength distribution of 130Te was investigated with the method of Nuclear Resonance Fluorescence using continuous-energy bremsstrahlung at the Darmstadt High Intensity Photon Setup and quasi-monoenergetic photons at the High Intensity γ-Ray Source. The average decay properties were determined between 5.50 and 8.15 MeV and compared to simulations within the statistical model.
Dark matter could accumulate around neutron stars in sufficient amounts to affect their global properties. In this work, we study the effect of a specific model for dark matter—a massive and self-interacting vector (spin-1) field—on neutron stars. We describe the combined systems of neutron stars and vector dark matter using Einstein–Proca theory coupled to a nuclear matter term and find scaling relations between the field and metric components in the equations of motion. We construct equilibrium solutions of the combined systems, compute their masses and radii, and also analyze their stability and higher modes. The combined systems admit dark matter (DM) core and cloud solutions. Core solutions compactify the neutron star component and tend to decrease the total mass of the combined system. Cloud solutions have the inverse effect. Electromagnetic observations of certain cloud-like configurations would appear to violate the Buchdahl limit. This could make Buchdahl-limit-violating objects smoking gun signals for dark matter in neutron stars. The self-interaction strength is found to significantly affect both mass and radius. We also compare fermion Proca stars to objects where the dark matter is modeled using a complex scalar field. We find that fermion Proca stars tend to be more massive and geometrically larger than their scalar field counterparts for equal boson masses and self-interaction strengths. Both systems can produce degenerate masses and radii for different amounts of DM and DM particle masses.
Based on a data sample of 10 billion J/ψ events collected with the BESIII detector, improved measurements of the Dalitz decays η/η′→γe+e− are performed, where the η and η′ are produced through the radiative decays J/ψ→γη/η′. The branching fractions of η→γe+e− and η′→γe+e− are measured to be (7.07±0.05±0.23)×10−3 and (4.83±0.07±0.14)×10−4, respectively. Within the single pole model, the parameter of electromagnetic transition form factor for η→γe+e− is determined to be Λη=(0.749±0.027±0.007) GeV/c2. Within the multi-pole model, we extract the electromagnetic transition form factors for η′→γe+e− to be Λη′=(0.802±0.007±0.008) GeV/c2 and γη′=(0.113±0.010±0.002) GeV/c2. The results are consistent with both theoretical predictions and previous measurements. The characteristic sizes of the interaction regions for the η and η′ are calculated to be (0.645±0.023±0.007) fm and (0.596±0.005±0.006) fm, respectively. In addition, we search for the dark photon in η/η′→γe+e−, and the upper limits of the branching fractions as a function of the dark photon are given at 90\% confidence level.
Based on 4.5 fb−1 of e+e− collision data accumulated at center-of-mass energies between 4599.53 MeV and 4698.82 MeV with the BESIII detector, the decay Λ+c→nK0Sπ+π0 is observed for the first time with a significance of 9.2σ. The branching fraction is measured to be (0.85±0.13±0.03)%, where the first uncertainty is statistical and the second systematic, which differs from the theoretical prediction based on isospin by 4.4σ. This indicates that there may be resonant contributions or some unknown dynamics in this decay.
Using (27.12±0.14)×108 ψ(3686) events collected with the BESIII detector at BEPCII, the decay of ψ(3686)→Ω−K+Ξ¯0+c.c. is observed for the first time. The branching fraction of this decay is measured to be Bψ(3686)→Ω−K+Ξ¯0+c.c.=(2.78±0.40±0.18)×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.
Species of the cleptoparasitic bee genus Triepeolus Robertson, 1901 (Hymenoptera: Apidae: Nomadinae) of which the female has a trapezoidal or triangular pseudopygidial area with bright, reflective setae and a concave apical margin are revised. This entirely New World group includes the widely known species T. simplex Robertson, 1903 and is thus termed the simplex species group. A total of 18 species in the T. simplex group are recognized as valid, of which seven are newly named and described—T. apache sp. nov., T. eumeniformis sp. nov., T. hirsutus sp. nov., T. oblongimacula sp. nov., T. parahirsutus sp. nov., T. paucipunctatus sp. nov., and T. shoshone sp. nov., all from North America. Eleven redundant names are newly synonymized under three valid ones as follows: Epeolus rugulosus Cockerell, 1917 syn. nov., E. metatarsalis Friese, 1921 syn. nov., and T. bilunatus Cockerell, 1949 syn. nov. under Triepeolus mexicanus (Cresson, 1878); E. lectiformis Cockerell, 1925 syn. nov., T. lusor Cockerell, 1925 syn. nov., and T. junctus Mitchell, 1962 syn. nov. under T. rhododontus Cockerell, 1921; and E. permixtus Cockerell, 1923 syn. nov., T. brunnescens Cockerell & Sandhouse, 1924 syn. nov., T. pacis Cockerell, 1925 syn. nov., E. sarothrinus Cockerell, 1929 syn. nov., and E. sarothrinus var. confluens Cockerell, 1929 syn. nov. under T. segregatus (Cockerell, 1900). Species limits were established using an integrative systematics approach, namely considering morphological and biogeographic evidence as well as DNA barcode data. Taxon concepts are revised for all species in the T. simplex group, with morphological diagnoses and keys presented to enable their identification. Known information on the ranges and ecology of the treated species is summarized.
The Born cross section of the process e+e−→ΛΛ¯ is measured at 33 center-of-mass energies between 3.51 and 4.60 GeV using data corresponding to the total integrated luminosity of 20.0 fb−1 collected with the BESIII detector at the BEPCII collider. Describing the energy dependence of the cross section requires a contribution from the ψ(3770)→ΛΛ¯ decay, which is fitted with a significance of 4.6-4.9σ including the systematic uncertainty. The lower bound on its branching fraction is 2.4×10−6 at the 90% confidence level (C.L.), at least an order of magnitude larger than expected from predictions using a scaling based on observed electronic widths. This result indicates the importance of effects from vector charmonium(-like) states when interpreting data in terms of e.g., electromagnetic structure observables. The data do not allow for definite conclusions on the interplay with other vector charmonium(-like) states, and we set 90% C.L.upper limits for the products of their electronic widths and the branching fractions.
Using (448.1±2.9)×106 ψ(3686) events collected with the BESIII detector and a single-baryon tagging technique, we present the first observation of the decays ψ(3686)→Ξ(1530)0Ξ¯(1530)0 and Ξ(1530)0Ξ¯0. The branching fractions are measured to be B(ψ(3686)→Ξ(1530)0Ξ¯(1530)0)=(6.77±0.14±0.39)×10−5 and B(ψ(3686)→Ξ(1530)0Ξ¯0)=(0.53±0.04±0.03)×10−5. Here, the first and second uncertainties are statistical and systematic, respectively. In addition, the parameter associated with the angular distribution for the decay ψ(3686)→Ξ(1530)0Ξ¯(1530)0 is determined to be α=0.32±0.19±0.07, in agreement with theoretical predictions within one standard deviation.
Using J/ψ radiative decays from 9.0 billion J/ψ events collected by the BESIII detector, we search for di-muon decays of a CP-odd light Higgs boson (A0), predicted by many new physics models beyond the Standard Model, including the Next-to-Minimal Supersymmetric Standard Model. No evidence for the CP-odd light Higgs production is found, and we set 90% confidence level upper limits on the product branching fraction B(J/ψ→γA0)×B(A0→μ+μ−) in the range of (1.2−778.0)×10−9 for 0.212≤mA0≤3.0 GeV/c2. The new measurement is a 6-7 times improvement over our previous measurement, and is also slightly better than the BaBar measurement in the low-mass region for tanβ=1.
Based on 3.19 fb−1 of e+e− collision data accumulated at the center-of-mass energy 4.178 GeV with the BESIII detector operating at the BEPCII collider, the electromagnetic Dalitz decay D∗0→D0e+e− is observed for the first time with a statistical significance of 13.2σ. The ratio of the branching fraction of D∗0→D0e+e− to that of D∗0→D0γ is measured to be (11.08±0.76±0.49)×10−3. By using the world average value of the branching fraction of D∗0→D0γ, the branching fraction of D∗0→D0e+e− is determined to be (3.91±0.27±0.17±0.10)×10−3, where the first uncertainty is statistical, the second systematic and the third external branching fractions.