Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in √s = 7 TeV pp collisions with the ATLAS detector

A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fb−1 of proton–proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results

Jet size dependence of single jet suppression in lead-lead collisions at sqrt(s(NN)) = 2.76 TeV with the ATLAS detector at the LHC

Measurements of inclusive jet suppression in heavy ion collisions at the LHC provide direct sensitivity to the physics of jet quenching. In a sample of lead-lead collisions at sqrt(s) = 2.76 TeV corresponding to an integrated luminosity of approximately 7 inverse microbarns, ATLAS has measured jets with a calorimeter over the pseudorapidity interval |eta| < 2.1 and over the transverse momentum range 38 < pT < 210 GeV. Jets were reconstructed using the anti-kt algorithm with values for the distance parameter that determines the nominal jet radius of R = 0.2, 0.3, 0.4 and 0.5. The centrality dependence of the jet yield is characterized by the jet "central-to-peripheral ratio," Rcp. Jet production is found to be suppressed by approximately a factor of two in the 10% most central collisions relative to peripheral collisions. Rcp varies smoothly with centrality as characterized by the number of participating nucleons. The observed suppression is only weakly dependent on jet radius and transverse momentum. These results provide the first direct measurement of inclusive jet suppression in heavy ion collisions and complement previous measurements of dijet transverse energy imbalance at the LHC.Comment: 15 pages plus author list (30 pages total), 8 figures, 2 tables, submitted to Physics Letters B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2011-02

Operation and performance of the ATLAS semiconductor tracker

The semiconductor tracker is a silicon microstrip detector forming part of the inner tracking system of the ATLAS experiment at the LHC. The operation and performance of the semiconductor tracker during the first years of LHC running are described. More than 99% of the detector modules were operational during this period, with an average intrinsic hit efficiency of (99.74±0.04)%. The evolution of the noise occupancy is discussed, and measurements of the Lorentz angle, δ-ray production and energy loss presented. The alignment of the detector is found to be stable at the few-micron level over long periods of time. Radiation damage measurements, which include the evolution of detector leakage currents, are found to be consistent with predictions and are used in the verification of radiation background simulations

Search for supersymmetry at √S=8TeV in final states with jets and two same-sign leptons or three leptons with the ATLAS detector

A search for strongly produced supersymmetric particles is conducted using signatures involving multiple energetic jets and either two isolated leptons (e or μ) with the same electric charge, or at least three isolated leptons. The search also utilises jets originating from b-quarks, missing transverse momentum and other observables to extend its sensitivity. The analysis uses a data sample corresponding to a total integrated luminosity of 20.3 fb−1 of √s = 8 TeV proton-proton collisions recorded with the ATLAS detector at the Large Hadron Collider in 2012. No deviation from the Standard Model expectation is observed. New or significantly improved exclusion limits are set on a wide variety of supersymmetric models in which the lightest squark can be of the first, second or third generations, and in which R-parity can be conserved or violated

An ab initio study of deep-level defects in silicon

Theoretical investigations into deep-level defects in crystalline silicon are presented in this thesis. The calculations are carried out using the AIMPRO code, an ab initio pseudopotential local spin density method applied to large hydrogen terminated clusters containing up to 346 atoms. By definition, deep-level defects are those with localised states, i. e., states with decaying wavefunctions in real space. As a result, these defects can, and often do, give rise to a number of levels lying within the silicon bandgap. Due to the fact that the presence of these levels within the Si forbidden band can dramatically change the optical and electrical properties of Si integrated devices, the understanding of their microscopic properties is of paramount importance. Two distinct types of deep-level defects are investigated: (i) radiation-induced defects and (ii) transition-metal (TM) related defects. Most of these defects are unstable against Jahn-Teller distortions. Since their electrical properties are highly sensitive to their atomic arrangement, it is therefore necessary to correctly describe their ground state configurations. The back-bone of this thesis is a novel theoretical approach to the calculation of the electrical level of deep-level defects. This method has allowed the successful characterisation a number of common defects in radiation damaged Si material, like VO (A-centre), VOH, C_iP, C_iO_i, C_iC_s-H (T-centre), etc. The method is then applied to the study of the structural and electrical properties of the lattice di-vacancy. As a result, we confirm the predictions of Watkins and Corbett for the structural properties of paramagnetic V_2&quot;#+-# defects. Accordingly, these defects undergo a strong Jahn-Teller distortion by pairing of four of the six atoms constituting the defect. This is followed by a study on the structural, vibrational and electrical properties of vacancy-hydrogen-related defects produced by low-temperature proton implantation. Finally, the method is applied to the analysis of the structural and electrical properties of substitutional transition-metal centres-gold, silver, platinum and palladium. The main goal of these calculations is the study of the influence on the electrical properties of these defects of bringing atomic hydrogen close to the defect's core. Concerning the structure of the TM-H defects, we find no evidence for a direct interaction between the hydrogen impurity and the TM ion. In accordance with the vacancy model of Watkins, the TM ions do seem to interact weakly with the surroundings, in an attempt to reproduce their environment as isolated species. Despite an enlargement of the vacancy cage, the hydrogen atoms sit at 'anti-bonding' lattice positions, being back-bonded to the Si vacancy atoms. No electrically inactive TM-H_n, with n = 1...4, were found and an alternative model for the neutralisation of the electrical properties of these centres is proposed. (author)SIGLEAvailable from British Library Document Supply Centre-DSC:DXN033778 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Natural Infestation By Frugivorous Flies (diptera: Tephritoidea) In Shaded And Unshaded Arabic Coffee Under Organic Management In Valença, Rj, Brazil [infestação Natural De Moscas Frugívoras (diptera: Tephritoidea) Em Café Arábica, Sob Cultivo Orgânico Arborizado E A Pleno Sol, Em Valença, Rj]

Frugivorous flies have been acquiring great economic importance in coffee crop because they cause premature dropping of coffee beans and significantly decrease the quality of the beverage. The coffee plant is also a natural reservoir of Tephritidae species that infest fruits of economic importance. This study evaluated the influence of the shaded and unshaded coffee systems, under organic management, on the natural infestation of fruits of Coffea arabica L. var. Icatu Amarelo by frugivorous flies. An experiment in completely randomized design was carried out in Valença, RJ, Brazil, with two treatments (shaded coffee with Musa sp. and Erithrina verna Vell. and unshaded coffee monoculture) and four replicates. A 1kg-sample of maturing fruits per plot was harvested in Mach 2004 to evaluate infestation and identify the flies. The mean infestation index was significantly higher in the shaded coffee system. Four species of Tephritidae (Ceratitis capitata (Wiedemann), Anastrepha fraterculus (Wiedemann), Anastrepha obliqua (Macquart) and Anastrepha sororcula Zucchi), and six of Lonchaeidae (Neosilba pendula (Bezzi), Neosilba pseudopendula (Korytkowski and Ojeda), Neosilba certa (Walker), Neosilba glaberrima (Wiedemann), Neosilba n.sp.9 and Neosilba n.sp.10) were recovered from coffee fruits. Nine parasitoid species were obtained, six belonging to Braconidae (Asobara anastrephae (Muesebeck), Doryctobracon areolatus (Szépligeti), Doryctobracon brasiliensis (Szépligeti), Utetes anastrephae (Viereck), Opius bellus Gahan and Opius sp.), and three to Figitidae (Aganaspis pelleranoi (Brèthes), Dicerataspis flavipes (Kieffer) and Odontosema anastrephae Borgmeier). 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