Study of doubly strange systems using stored antiprotons

Bound nuclear systems with two units of strangeness are still poorly known despite their importance for many strong interaction phenomena. Stored antiprotons beams in the GeV range represent an unparalleled factory for various hyperon-antihyperon pairs. Their outstanding large production probability in antiproton collisions will open the floodgates for a series of new studies of systems which contain two or even more units of strangeness at the P‾ANDA experiment at FAIR. For the first time, high resolution γ-spectroscopy of doubly strange ΛΛ-hypernuclei will be performed, thus complementing measurements of ground state decays of ΛΛ-hypernuclei at J-PARC or possible decays of particle unstable hypernuclei in heavy ion reactions. High resolution spectroscopy of multistrange Ξ−-atoms will be feasible and even the production of Ω−-atoms will be within reach. The latter might open the door to the |S|=3 world in strangeness nuclear physics, by the study of the hadronic Ω−-nucleus interaction. For the first time it will be possible to study the behavior of Ξ‾+ in nuclear systems under well controlled conditions

Search for dark matter produced in association with a hadronically decaying vector boson in pp collisions at sqrt (s) = 13 TeV with the ATLAS detector

A search is presented for dark matter produced in association with a hadronically decaying W or Z boson using 3.2 fb−1 of pp collisions at View the MathML sources=13 TeV recorded by the ATLAS detector at the Large Hadron Collider. Events with a hadronic jet compatible with a W or Z boson and with large missing transverse momentum are analysed. The data are consistent with the Standard Model predictions and are interpreted in terms of both an effective field theory and a simplified model containing dark matter

The LHCb upgrade I

The LHCb upgrade represents a major change of the experiment. The detectors have been almost completely renewed to allow running at an instantaneous luminosity five times larger than that of the previous running periods. Readout of all detectors into an all-software trigger is central to the new design, facilitating the reconstruction of events at the maximum LHC interaction rate, and their selection in real time. The experiment's tracking system has been completely upgraded with a new pixel vertex detector, a silicon tracker upstream of the dipole magnet and three scintillating fibre tracking stations downstream of the magnet. The whole photon detection system of the RICH detectors has been renewed and the readout electronics of the calorimeter and muon systems have been fully overhauled. The first stage of the all-software trigger is implemented on a GPU farm. The output of the trigger provides a combination of totally reconstructed physics objects, such as tracks and vertices, ready for final analysis, and of entire events which need further offline reprocessing. This scheme required a complete revision of the computing model and rewriting of the experiment's software

Afm Studies Of Composite 16-mer Polyaniline Langmuir-biodgett (lb) Films

Atomic force microscopy (AFM) images of composite Langmuir-Blodgett (LB) films containing different weight percentages of cadmium stearate and 16-mer polyaniline are investigated. Upon increasing the amount of 16-mer polyaniline content in the composite, large globular structures with higher average roughness could be seen. © 1999 Elsevier Science S.A. All rights reserved.1011-3830831(1990) Langmuir-Blodgett Films, , G.G. Roberts (Ed.) Plenum Press, New YorkDhanabalan, A., Riul Jr., A., Oliveira Jr., O.N., (1998) Supramolecular Science, 5, p. 75. , and references thereinMacDiarmid, A.G., (1997) Synth. Met., 84, p. 27Dhanabalan, A., Riul Jr., A., Mattoso, L.H.C., Oliveira Jr., O.N., (1997) Langmuir, 13, p. 4882Riul Jr., A., Dhanabalan, A., Mattoso, L.H.C., De Souza, L.M., Ticianelli, E.A., Oliveira Jr., O.N., Thin Solid Films, , in pressSuwa, T., Kakimoto, M., Imai, Y., Araki, I., Iriyama, K., (1994) Mol. Cryst. Liq. Cryst, 225, p. 45Constantino, C.J.L., Dhanabalan, A., Pereira Da Silva, M.A., Cotta, M.A., Oliveira Jr., O.N., submitte