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The hadronic reaction p K p p 0 + Σ → was measured exclusively at a beam momentum of 2.95 GeV/c using the TOF detector at the COSY storage ring. A narrow peak was observed in the invariant mass spectrum of the p K 0 subsystem at 1530 ± 5 MeV/c 2 with a significance of 4 -6 standard deviations, depending on background assumptions. The upper limit of 18 ± 4 MeV/c 2 (FWHM) for its width is given by the experimental resolution. The corresponding total cross section is estimated to be about 0.4 ± 0.1(stat) ± 0.1(syst) µb. Since a resonance in this subsystem must have strangeness S = + 1 we claim it to be the + Θ state for which very recently evidence was found in various experiments.

SUMMARYState‐of‐the‐art research in a variety of natural sciences depends heavily on methods of computational chemistry, for example, the calculation of the properties of materials, proteins, catalysts, and drugs. Applications providing such methods require a lot of expertise to handle their complexity and the usage of high‐performance computing. The MoSGrid (molecular simulation grid) infrastructure relieves this burden from scientists by providing a science gateway, which eases access to and usage of computational chemistry applications. One of its cornerstones is the molecular simulations markup language (MSML), an extension of the chemical markup language. MSML abstracts all chemical as well as computational aspects of simulations. An application and its results can be described with common semantics. Using such application, independent descriptions users can easily switch between different applications or compare them. This paper introduces MSML, its integration into a science gateway, and its usage for molecular dynamics, quantum chemistry, and protein docking. Copyright © 2013 John Wiley & Sons, Ltd.

Abstract. This paper reports results from a study of the reaction pp → pK 0 Σ + at beam momenta of p beam = 2950, 3059, and 3200 MeV/c (excess energies of ǫ = 126, 161, and 206 MeV). Total cross sections were determined for all energies; a set of differential cross sections (Dalitz plots; invariant mass spectra of all two-body subsystems; angular distributions of all final state particles; distributions in helicity and Jackson frames) are presented for ǫ = 161 MeV. The total cross sections are proportional to the volume of available three-body phase-space indicating that the transition matrix element does not change significantly in this range of excess energies. It is concluded from the differential data that the reaction proceeds dominantly via the N (1710)P11 and/or N (1720)P13 resonance(s); N (1650)S11 and ∆(1600)P33 could also contribute. PACS. 13.75.Cs Nucleon-nucleon interactions -13.75.-n Hadron-induced low-and intermediate-energy reactions and scattering (energy ≤ 10 GeV) -13.75.Ev Hyperon-nucleon interactions -25.40.Ve Other reactions above meson production thresholds (energies > 400 MeV)