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

Measurement of the View the tt production cross-section using eμ events with b-tagged jets in pp collisions at √s = 13 TeV with the ATLAS detector

This paper describes a measurement of the inclusive top quark pair production cross-section (σtt¯) with a data sample of 3.2 fb−1 of proton–proton collisions at a centre-of-mass energy of √s = 13 TeV, collected in 2015 by the ATLAS detector at the LHC. This measurement uses events with an opposite-charge electron–muon pair in the final state. Jets containing b-quarks are tagged using an algorithm based on track impact parameters and reconstructed secondary vertices. The numbers of events with exactly one and exactly two b-tagged jets are counted and used to determine simultaneously σtt¯ and the efficiency to reconstruct and b-tag a jet from a top quark decay, thereby minimising the associated systematic uncertainties. The cross-section is measured to be: σtt¯ = 818 ± 8 (stat) ± 27 (syst) ± 19 (lumi) ± 12 (beam) pb, where the four uncertainties arise from data statistics, experimental and theoretical systematic effects, the integrated luminosity and the LHC beam energy, giving a total relative uncertainty of 4.4%. The result is consistent with theoretical QCD calculations at next-to-next-to-leading order. A fiducial measurement corresponding to the experimental acceptance of the leptons is also presented

Measurement of the top quark mass in the tt→ dilepton channel from √s = 8 TeV ATLAS data

The top quark mass is measured in the tt¯ → dilepton channel (lepton = e,μ) using ATLAS data recorded in the year 2012 at the LHC. The data were taken at a proton proton centre-of-mass energy of √s = 8 TeV and correspond to an integrated luminosity of about 20.2 fb−1. Exploiting the template method, and using the distribution of invariant masses of lepton–b-jet pairs, the top quark mass is measured to be mtop = 172.99±0.41 (stat) ±0.74 (syst) GeV, with a total uncertainty of 0.84 GeV. Finally, a combination with previous ATLAS mtop measurements from √s = 7 TeV data in the tt¯ → dilepton and tt¯ → lepton + jets channels results in mtop = 172.84±0.34 (stat)±0.61 (syst) GeV, with a total uncertainty of 0.70 GeV

First measurement of hadronic event shapes in pp collisions at √s = 7 TeV

This is the Pre-Print version of the Article - Copyright @ 2011 ElsevierHadronic event shapes have been measured in proton-proton collisions at sqrt(s)=7 TeV, with a data sample collected with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 3.2 inverse picobarns. Event-shape distributions, corrected for detector response, are compared with five models of QCD multijet production

MOBILE AUTOMATED FIELD INSTRUMENTATION SYSTEM TRADOC COMBINED ARMS TEST ACTIVITY (TCATA)

International Telemetering Conference Proceedings / October 28-31, 1985 / Riviera Hotel, Las Vegas, NevadaIn early 1978, as part of on-going organizational and resource assessments at Headquarters, U.S. Army Training and Doctrine Command (TRADOC), one important factor evaluated was the most efficient and effective way to support current and future TRADOC sponsored user tests and how to maximize TRADOC support to the Operational Test and Evaluation Agency (OTEA) and joint testers within existing and anticipated resource limitations. It was concluded that existing test and evaluation instrumentation was: a. Not mobile which caused test scheduling conflicts at fixed test sites. b. Not adequate to support current and future Army user and joint test requirements for large scale realistic scenarios and c. Obsolete and becoming uneconomical to operate and maintain; particularly at the TRADOC Combined Arms Test Activity (TCATA). In May 1978, TCATA, in conjunction with the Combat Developments Experimentation Center (CDEC), was directed to develop TRADOC requirements and a concept for an instrumentation system that would meet the goals indicated in Figure 1. Some of the key goals indicated in this tasking are commonality and interoperability of test and training range instrumentation and the capability of instrumenting field exercises. The concept developed as a result of this directive is the Mobile Automated Field Instrumentation System (MAFIS) development program. The purpose of this presentation is to provide a MAFIS system overview and discuss the implementation of the various MAFIS subsystems and how the chosen implementation supports the goals identified by the TRADOC Commander.International Foundation for TelemeteringProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection

Laser-plasma interactions in high-energy density plasmas

Laser-plasma interactions (LPI) have been studied experimentally in high-temperature, high-energy density plasmas. The studies have been performed using the Omega laser at the Laboratory for Laser Energetics (LLE), Rochester, NY. Up to 10 TW of power was incident upon reduced-scale hohlraums, distributed in three laser beam cones. The hot hohlraums fill quickly with plasma. Late in the laser pulse, most of the laser energy is deposited at the laser entrance hole, where most of the LPI takes place. Due to the high electron temperature, the stimulated Raman scattering (SRS) spectrum extends well beyond ${\rm \omega}_{0}$/2, due to the Bohm-Gross shift. This high-temperature, high-energy density regime provides a unique opportunity to study LPI beyond inertial confinement fusion (ICF) conditions

Rapid prototyping of electronic modules combining aerosol printing and ink jet printing

Maskless direct printing is a good candidate for rapid prototyping and even emerging for manufacturing of large scale electronics. Aiming for rapid prototyping of small multi-layer modules the study combines Aerosol Jet® printing and ink jet printing. Conductive silver traces own to 20 m width were printed together with large mterconnect areas on isolating layers of inorganic-organic hybrid polymer (ORMOCER®) and on glass substrates. New copper nickel inks and high-k ORMOCER®s filled with barium titanate particles are paving a path to integrated printed resistors and capacitors. Although some issues still need to be resolved for a commercial grade process the detail solutions presented for the first time and the active integrated circuits and devices attached to the same substrate demonstrate a path and the principle technical feasibility of this method for heterogeneous integration