Transamazônica trans : five possible readings

A rodovia Transamazônica perfaz 50 anos de existência. O texto, ao delimitar esse período, expõe aos interessados cinco leituras possíveis de sua história. Certos de que um retrato fidedigno de sua trajetória é infactível em estudos de História, assumimos a seleção deliberada de episódios encontrados em fontes e documentos consultados, para, de algum modo, representar as inúmeras faces do objeto. Partimos do prefixo “trans” como dispositivo de interpretação da palavra “transamazônica”. Ao determinar tal prefixo como um potencializador de significados, pudemos identificar outras qualidades e entendimentos para a rodovia que não somente a de uma infraestrutura de transporte. A rodovia Transamazônica é, sobretudo, uma ação envolta por inúmeros atributos: é transfigurar por simbologias, é transpassar por escalas, é transformar pela tecnificação, é transparecer por paisagens utópicas, é transtornar pelos invisibilizados. São retratos de uma rodovia que a floresta, a seu modo, conseguiu domar. Mas, até quando?The Transamazônica highway is 50 years old. By delimiting this period, the text exposes to interested readings five possible parties of its history. Certain that a reliable portrait of its trajectory is infactible in History studies, we assume the deliberate selection of episodes found in consulted sources and documents, so that we could somehow represent the countless faces of such an object. We started with the prefix “trans” as a device for interpreting the word “transamazônica”. When determining such a prefix as an enhancer of meanings, we can identify other qualities and understandings for this road than just a transport infrastructure. The Transamazônica highway is, above all, an action, surrounded by innumerable attributes: is to transfigure by symbologies, it is to go through scales, it is to transform by technification, it is to show through utopian landscapes, it is upsetting by the invisible. They are portraits of a highway that the forest, in its own way, managed to tame. But until when

Constraints on the χ_(c1) versus χ_(c2) polarizations in proton-proton collisions at √s = 8 TeV

The polarizations of promptly produced χ_(c1) and χ_(c2) mesons are studied using data collected by the CMS experiment at the LHC, in proton-proton collisions at √s=8  TeV. The χ_c states are reconstructed via their radiative decays χ_c → J/ψγ, with the photons being measured through conversions to e⁺e⁻, which allows the two states to be well resolved. The polarizations are measured in the helicity frame, through the analysis of the χ_(c2) to χ_(c1) yield ratio as a function of the polar or azimuthal angle of the positive muon emitted in the J/ψ → μ⁺μ⁻ decay, in three bins of J/ψ transverse momentum. While no differences are seen between the two states in terms of azimuthal decay angle distributions, they are observed to have significantly different polar anisotropies. The measurement favors a scenario where at least one of the two states is strongly polarized along the helicity quantization axis, in agreement with nonrelativistic quantum chromodynamics predictions. This is the first measurement of significantly polarized quarkonia produced at high transverse momentum