63,619 research outputs found
Le travail social constructif: sources philosophiques et principes de pratique (Constructive social work: Philosophical roots and practice principles)
No full textMeasurement of the production cross section of prompt J/ψ mesons in association with a W± boson in pp collisions at p s = 7 TeV with the ATLAS detector
Get PDFThe process pp → W±J/ψ provides a powerful probe of the production mechanism of charmonium in hadronic collisions, and is also sensitive to multiple parton interactions in the colliding protons. Using the 2011 ATLAS dataset of 4.5 fb-1 of p s = 7TeV pp collisions at the LHC, the first observation is made of the production of W± + prompt J/ events in hadronic collisions, using W± → μ and J/ψ → μ+μ-. A yield of 27.4±7.5 -6.5 W± + prompt J/ψ events is observed, with a statistical significance of 5.1. The production rate as a ratio to the inclusive W± boson production rate is measured, and the double parton scattering contribution to the cross section is estimated
Measurement of associated W+ charm production in pp collisions at √s=7 TeV
Get PDFOpen Access, Copyright CERN, for the benefit of the CMS Collaboration.Measurements are presented of the associated production of a W boson and a charm-quark jet (W + c) in pp collisions at a center-of-mass energy of 7 TeV. The analysis is conducted with a data sample corresponding to a total integrated luminosity of 5 fb−1, collected by the CMS detector at the LHC. W boson candidates are identified by their decay into a charged lepton (muon or electron) and a neutrino. The W + c measurements are performed for charm-quark jets in the kinematic region p jet T > 25 GeV, |ηjet| 25 GeV) and σ(pp → W + c + X)× B (W → ℓν) = 84.1 ± 2.0 (stat.) ± 4.9 (syst.) pb ( p ℓ T > 35 GeV), and the cross section ratios σ(pp → W+ + c ¯ + X)/σ(pp → W− + c + X) = 0.954 ± 0.025 (stat.) ± 0.004 (syst.) ( p ℓ T > 25 GeV) and σ(pp → W+ + c ¯ + X)/σ(pp → W− + c + X) = 0.938 ± 0.019 (stat.) ± 0.006 (syst.) ( p ℓ T > 35 GeV). Cross sections and cross section ratios are also measured differentially with respect to the absolute value of the pseudorapidity of the lepton from the W-boson decay. These are the first measurements from the LHC directly sensitive to the strange quark and antiquark content of the proton. Results are compared with theoretical predictions and are consistent with the predictions based on global fits of parton distribution functions
Child Protection and Safeguarding in England: Changing and Competing Conceptions of Risk and their Implications for Social Work
No full textThis paper critically reflects on policy developments and debates in England in relation to child protection and safeguarding over the past twenty years. It argues that the period from the early 1990s to late 2008 saw policy change in significant ways. The state developed a much broader focus of concern about what constituted risk to children and what the role of professionals should be in relation to this; increasingly, the emphasis was upon ‘safeguarding’ rather than ‘child protection’. However, the period since late 2008 has not only seen the focus shift more centrally to child protection, but there has been a renewed official priority given to social work. These developments have been given an added impetus with the election of the Conservative/Liberal Democrat Coalition government in May 2010. The paper concludes by considering the current state and possible future directions for child protection and safeguarding in England and the role of social work in this
Measurement of the low-mass Drell-Yan differential cross section at √s = 7 TeV using the ATLAS detector
Get PDFThe differential cross section for the process Z/γ ∗ → ℓℓ (ℓ = e, μ) as a function of dilepton invariant mass is measured in pp collisions at s√ = 7 TeV at the LHC using the ATLAS detector. The measurement is performed in the e and μ channels for invariant masses between 26 GeV and 66 GeV using an integrated luminosity of 1.6 fb−1 collected in 2011 and these measurements are combined. The analysis is extended to invariant masses as low as 12 GeV in the muon channel using 35 pb−1 of data collected in 2010. The cross sections are determined within fiducial acceptance regions and corrections to extrapolate the measurements to the full kinematic range are provided. Next-to-next-to-leading-order QCD predictions provide a significantly better description of the results than next-to-leading-order QCD calculations, unless the latter are matched to a parton shower calculation
Primitive abundant and weird numbers with many prime factors
Get PDFInternational audienceWe give an algorithm to enumerate all primitive abundant numbers (briefly, PANs) with a fixed (the number of prime factors counted with their multiplicity), and explicitly find all PANs up to , count all PANs and square-free PANs up to and count all odd PANs and odd square-free PANs up to . We find primitive weird numbers (briefly, PWNs) with up to 16 prime factors, improving the previous results of [Amato-Hasler-Melfi-Parton] where PWNs with up to 6 prime factors have been given. The largest PWN we find has 14712 digits: as far as we know, this is the largest example existing, the previous one being 5328 digits long [Melfi]. We find hundreds of PWNs with exactly one square odd prime factor: as far as we know, only five were known before. We find all PWNs with at least one odd prime factor with multiplicity greater than one and and prove that there are none with . Regarding PWNs with a cubic (or higher) odd prime factor, we prove that there are none with , and we did not find any with larger . Finally, we find several PWNs with 2 square odd prime factors, and one with 3 square odd prime factors. These are the first such examples
Q&A: Peter Kimani, author of Dance of the Jakaranda, talks with Maëline Le Lay
No full textAfrica in Words. https://africainwords.com/2019/05/23/qa-peter-kimani-author-of-dance-of-the-jakaranda-talks-with-maeline-le-lay
Parton Densities at the LHC
No full textThis contribution to the Italian ``Workshop sui Monte Carlo, la Fisica e le Simulazioni a LHC'', held at LNF, Frascati, in February, May and October 2006, summarises the status of parton density functions (PDF's) and the impact of their uncertainties on the LHC physics. Emphasis is given to methods of contraining PDF's using LHC data. Moreover, the advantages of the so-called PDF reweighting technique, which enables to quickly estimate PDF uncertainties with Monte Carlo events, are also presented
Geographic profiling in Nazi Berlin: fact and fiction
Get PDFGeographic profiling uses the locations of connected crime sites to make inferences about the probable location of the offender’s ‘anchor point’ (usually a home, but sometimes a workplace). We show how the basic ideas of the method were used in a Gestapo investigation that formed the basis of a classic German novel about domestic resistance to the Nazis during the Second World War. We use modern techniques to re-analyse this case, and show that these successfully locate the Berlin home address of Otto and Elise Hampel, who had distributed hundreds of anti-Nazi postcards, after analysing just 34 of the 214 incidents that took place before their arrest. Our study provides the first empirical evidence to support the suggestion that analysis of minor terrorism-related acts such as graffiti and theft could be used to help locate terrorist bases before more serious incidents occur
Inclusive W and Z production in the forward region at √s=7TeV
Get PDFMeasurements of inclusive W and Z boson production cross-sections in pp collisions at s√=7TeV using final states containing muons are presented. The data sample corresponds to an integrated luminosity of 37 pb−1 collected with the LHCb detector. The W and Z bosons are reconstructed from muons with a transverse momentum above 20 GeV/c and pseudorapidity between 2.0 and 4.5, and, in the case of the Z cross-section, a dimuon invariant mass between 60 and 120 GeV/c2. The cross-sections are measured to be 831 ± 9 ± 27 ± 29pb for W +, 656 ± 8 ± 19 ± 23 for W − and 76.7 ± 1.7 ± 3.3 ± 2.7pb for Z, where the first uncertainty is statistical, the second is systematic and the third is due to the luminosity. Differential cross-sections, W and Z cross-section ratios and the lepton charge asymmetry are also measured in the same kinematic region. The ratios are determined to be σW+→μ+ν/σW−→μ−ν−=1.27±0.02±0.01 and (σW+→μ+ν+σW−→μ−ν−)/σZ→μμ=19.4±0.5±0.9 . The results are in general agreement with theoretical predictions, performed at next-to-next-to-leading order in QCD using recently calculated parton distribution functions
- …
