[en] We study the Υ(3S, 2S) → ηΥ(1S) and Υ(3S, 2S) → π⁺π^-Υ(1S) transitions with 122 x 10⁶ Υ(3S) and 100 x 10⁶ Υ(2S) mesons collected by the BABAR detector at the PEP-II asymmetric-energy e⁺e^- collider. We measure Β[Υ(2S) → ηΥ(1S)] = (2.39 ± 0.31(stat.) ± 0.14(syst.)) x 10^-4 and Λ[Υ(2S) → ηΥ(1S)]/Λ[Υ(2S) → π⁺π^-Υ(1S)] = (1.35 ± 0.17(stat.) ± 0.08(syst.)) x 10^-3. We find no evidence for Υ(3S) → ηΥ(1S) and obtain Β[Υ(3S) → ηΥ(1S)] < 1.0 x 10^-4 and Λ[Υ(3S) → ηΥ(1S)]/Λ[Υ(3S) → π⁺π^-Υ(1S)] < 2.3 x 10^-3 as upper limits at the 90% confidence level. We also provide improved measurements of the Υ(2S)-Υ(1S) and Υ(3S)-Υ(1S) mass differences, 562.170 ± 0.007(stat.) ± 0.088(syst.)MeV/c² and 893.813 ± 0.015(stat.) ± 0.107(syst.)MeV/c², respectively.

No abstract available

[en] Recent data on neutrino mass differences are consistent with a hierarchical neutrino mass structure strikingly similar to what is observed for the other fermionic masses. (author)

[en] The decay width and mass of the D_s1(2536)⁺ meson are measured via the decay channel D_s1⁺ → D*⁺ K_S⁰ using 385 fb^-1 of data recorded with the BABAR detector in the vicinity of the Υ(4S) resonance at the PEP-II asymmetric-energy electron-positron collider. The result for the decay width is Γ(D_s1⁺) = 0.92 ± 0.03 (stat.) ± 0.04 (syst.)MeV. For the mass, a value of m(D_s1⁺) = 2535.08 ± 0.01 (stat.) ± 0.15 (syst.)MeV/c² is obtained. The mass difference between the D_s1⁺ and the D*⁺ is measured to be m(D_s1⁺)-m(D*⁺) = 524.83 ± 0.01 (stat.) ± 0.04 (syst.)MeV/c², representing a significant improvement compared to the current world average. The unnatural spin-parity assignment for the D_s1⁺ meson is confirmed.

[en] A method is proposed for the determination of Δ⁺⁺-Δ⁰ pole parameters. The method is free of ambiguity due to the pole-backgroud separation and takes into account all available information about the partial wave amplitudes. The method is tested by two model amplitudes with pole positions known beforehand. Three different approaches are presented based on the same method and the corresponding pole shifts in model amptitudes are calculated. (author)

[en] The microcausality condition allowing to express amplitudes Tsub(i)(ν, q²) of the virtual photon forward scattering by a hadron in terms of the Wsub(i)(ν, q²) functions for the electroproduction process, is applied to explain the mass differences between particles forming the isotopic multiplet. The doublet mass differences are shown to be independent on electroproduction. Various explanations of the mass differences observed are discussed

[en] The nuclear dependence of the neutron-proton mass difference is examined in a relativistic harmonic quark model with the assumption of a swelling of the individual nucleon originated by a decrease of the spring constant inside the nuclear medium. A decrease of the neutron-proton mass difference is obtained which is reasonably small and in the right direction to cope with the Nollenn-Schiffer anomaly in mirror nuclei. (author)

[en] A progress report of the CDHS and CHARM experiments measuring ν-oscillations at the CERN PS is presented. Expected rates and upper limits for the ν-mass differences and mixing angles are also given

[en] Short communication

[en] We present a comparative study of four physical dust models and two single-temperature modified blackbody models by fitting them to the resolved WISE, Spitzer, and Herschel photometry of M101 (NGC 5457). Using identical data and a grid-based fitting technique, we compare the resulting dust and radiation field properties derived from the models. We find that the dust mass yielded by the different models can vary by up to a factor of 3 (factor of 1.4 between physical models only), although the fits have similar quality. Despite differences in their definition of the carriers of the mid-IR aromatic features, all physical models show the same spatial variations for the abundance of that grain population. Using the well-determined metallicity gradient in M101 and resolved gas maps, we calculate an approximate upper limit on the dust mass as a function of radius. All physical dust models are found to exceed this maximum estimate over some range of galactocentric radii. We show that renormalizing the models to match the same Milky Way high-latitude cirrus spectrum and abundance constraints can reduce the dust mass differences between models and bring the total dust mass below the maximum estimate at all radii.