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Heavy flavour decay muon production at forward rapidity in proton–proton collisions at √s=7 TeV
(2012)
The production of muons from heavy flavour decays is measured at forward rapidity in proton–proton collisions at √s=7 TeV collected with the ALICE experiment at the LHC. The analysis is carried out on a data sample corresponding to an integrated luminosity Lint=16.5 nb−1. The transverse momentum and rapidity differential production cross sections of muons from heavy flavour decays are measured in the rapidity range 2.5<y<4, over the transverse momentum range 2<pt<12 GeV/c. The results are compared to predictions based on perturbative QCD calculations.
Harmonic decomposition of two particle angular correlations in Pb–Pb collisions at √sNN=2.76 TeV
(2012)
Angular correlations between unidentified charged trigger (t) and associated (a) particles are measured by the ALICE experiment in Pb–Pb collisions at √sNN=2.76 TeV for transverse momenta 0.25<pTt,a<15 GeV/c, where pTt>pTa. The shapes of the pair correlation distributions are studied in a variety of collision centrality classes between 0 and 50% of the total hadronic cross section for particles in the pseudorapidity interval |η|<1.0. Distributions in relative azimuth Δϕ≡ϕt−ϕa are analyzed for |Δη|≡|ηt−ηa|>0.8, and are referred to as “long-range correlations”. Fourier components VnΔ≡〈cos(nΔϕ)〉 are extracted from the long-range azimuthal correlation functions. If particle pairs are correlated to one another through their individual correlation to a common symmetry plane, then the pair anisotropy VnΔ(pTt,pTa) is fully described in terms of single-particle anisotropies vn(pT) as VnΔ(pTt,pTa)=vn(pTt)vn(pTa). This expectation is tested for 1⩽n⩽5 by applying a global fit of all VnΔ(pTt,pTa) to obtain the best values vn{GF}(pT). It is found that for 2⩽n⩽5, the fit agrees well with data up to pTa∼3–4 GeV/c, with a trend of increasing deviation as pTt and pTa are increased or as collisions become more peripheral. This suggests that no pair correlation harmonic can be described over the full 0.25<pT<15 GeV/c range using a single vn(pT) curve; such a description is however approximately possible for 2⩽n⩽5 when pTa<4 GeV/c. For the n=1 harmonic, however, a single v1(pT) curve is not obtained even within the reduced range pTa<4 GeV/c.
The ALICE Collaboration reports the measurement of the relative J/ψ yield as a function of charged particle pseudorapidity density dNch/dη in pp collisions at √s=7 TeV at the LHC. J/ψ particles are detected for pt>0, in the rapidity interval |y|<0.9 via decay into e+e−, and in the interval 2.5<y<4.0 via decay into μ+μ− pairs. An approximately linear increase of the J/ψ yields normalized to their event average (dNJ/ψ/dy)/〈dNJ/ψ/dy〉 with (dNch/dη)/〈dNch/dη〉 is observed in both rapidity ranges, where dNch/dη is measured within |η|<1 and pt>0. In the highest multiplicity interval with 〈dNch/dη(bin)〉=24.1, corresponding to four times the minimum bias multiplicity density, an enhancement relative to the minimum bias J/ψ yield by a factor of about 5 at 2.5<y<4 (8 at |y|<0.9) is observed.
Este artigo apresenta contribuições de Jürgen Habermas e Paulo Freire para a constituição de sujeitos crítico-reflexivos e suas implicações nos processos de ensino/pesquisa/extensão no campo dos Estudos Organizacionais. Mostramos que intersubjetividade e dialogicidade são condições para o entendimento entre sujeitos e é justamente por meio delas que ocorre sua constituição em um processo que é dialógico, pedagógico e político. Freire e Habermas oferecem elementos para desconstruir a lógica instrumental dominante e fornecem bases para a reconstrução de possibilidades inéditas/viáveis de formas de organizar e gerir. A partir disso, este artigo destaca a importância dos Estudos Organizacionais ampliarem o foco das possibilidades de ensino/pesquisa/extensão e direciona-os para um engajamento comunicativo e dialógico, ultrapassando as fronteiras das universidades. Essa reconstrução indica aos pesquisadores que participem de diferentes arenas públicas, do debate e da construção de problemas, em processos de resistência, da visibilidade e dramatização de questões problemáticas. Nos caminhos de Freire e Habermas, os Estudos Organizacionais não podem apenas desenvolver uma crítica à distância: é preciso coparticipar, co-agir, co-operar e coconstruir com os públicos em que se engajam.
This essay presents contributions by Jürgen Habermas and Paulo Freire for the constitution of critical-reflexive subjects and the implications in the teaching-research-extension processes in the field of Organizational Studies. We show that intersubjectivity and dialogicity are conditions for the understanding between subjects and it is precisely through these conditions that the subjects are constituted, in a process that is dialogical, pedagogical and political. Freire and Habermas offer elements to deconstruct dominant instrumental logic and provide the basis for the reconstruction of unprecedented-viable possibilities of ways of organizing and managing. Therefore, this article highlights the importance of Organizational Studies to broaden the focus of teaching-research-extension possibilities and directs them to a communicative and dialogic engagement, beyond the borders of universities. This reconstruction indicates that researchers participate in different public arenas, debate and build public problems, processes of resistance, visibility, and dramatization of problematic issues. Observing the contributions of Freire and Habermas, Organizational Studies as a field cannot be limited to developing a critique, from a distant point of view: it is necessary to co-participate, co-act, co-operate and co-construct with its public.