On the connection of Gamma-rays, Dark Matter and Higgs searches at LHC

Motivated by the upcoming Higgs analyzes we investigate the importance of the complementarity of the Higgs boson chase on the low mass WIMP search in direct detection experiments and the gamma-ray emission from the Galactic Center measured by the Fermi-LAT telescope in the context of the $SU(3)_c\otimes SU(3)_L\otimes U(1)_N$. We obtain the relic abundance, thermal cross section, the WIMP-nucleon cross section in the low mass regime and network them with the branching ratios of the Higgs boson in the model. We conclude that the Higgs boson search has a profound connection to the dark matter problem in our model, in particular for the case that ($M_{WIMP} < 60$ GeV) the BR($H \rightarrow 2$ WIMPs) $\gtrsim 90$. This scenario could explain this plateau of any mild excess regarding the Higgs search as well as explain the gamma-ray emission from the galactic center through the $b\bar{b}$ channel with a WIMP in the mass range of 25-45 GeV, while still being consistent with the current limits from XENON100 and CDMSII. However, if the recent modest excesses measured at LHC and TEVATRON are confirmed and consistent with a standard model Higgs boson this would imply that $M_{WIMP} > 60$ GeV, consequently ruling out any attempt to explain the Fermi-LAT observations.Comment: 8 pages, 9 figure

Explaining ATLAS and CMS Results Within the Reduced Minimal 3-3-1 model

Recently the ATLAS and CMS collaborations announced the discovery of a higgs particle with a mass of $\sim 125$ GeV. The results are mildly consistent with the Standard Model Higgs boson. However, the combined data from these collaborations seem to point to an excess in the $h \rightarrow \gamma \gamma$ channel. In this work we analyze under which conditions this excess may be plausibly explained within the reduced minimal 3-3-1 model, while being consistent with bb, WW, ZZ and $\tau^+\tau^-$ channels. Moreover, we derive the properties of the heavy neutral and the doubly charged scalars predicted by the model. We then conclude that at a scale of a few TeV, this model provides a good fit to the ATLAS and CMS signal strength measurements, and therefore stands as an appealing alternative to the standard model.Comment: 23 pages, 9 figures. References adde

Controle biológico da broca da cana-de-açúcar

bitstream/item/79313/1/documento-287.pd

Atividades da Embrapa Clima Temperado na recuperação do potencial produtivo das lavouras de batata-doce do Rio Grande do Sul.

bitstream/item/44106/1/lavouras-batatadoce.pd

Agricultura irrigada: a importância da adubação.

A fertilidade do solo nos perímetros irrigados do Nordeste: Perímetro irrigado de Bebedouro - Petrolina-PE; Perímetro irrigado de Mandacaru - Juazeiro-BA; Perímetro irrigado Senador Nilo Coelho - Petrolina-PE; Perímetros irrigados do Submédio São Francisco; Perímetro Irrigado Itans/Sabugi - Caicó-RN; Perímetro Irrigado do Brumado - Livramento do Brumado-BA; Perímetro Irrigado de Morada Nova - Morada Nova-CE; Distribuição do sistema radicular das culturas em sistemas irrigados e a disponibilidade de nutrientes; A fertirrigação e o fator de retardamento; Mecanismos de resposta das plantas à salinidade; Disponibilidade de nutrientes em solos afetados por sais

Introdução e avaliação do método de irrigação por sucção na região do Trópico Semi-Árido.

A agricultura de sequeiro segue procedimento de produção, carentes de uma orientação tecnológica, que a faça avançar progressivamente, diminuindo os riscos provenientes da má distribuição de chuvas, das secas prolongadas e das chuvas esporádicas de grande intensidade, que caracterizam a região Nordestina. O centro de Pesquisa agropecuária do trópico Semi-árido - CPATSA/EMBRAPA, em Petrolina (PE), vem realizando uma série de pesquisa dentro do programa de Sequeiro, tendentes a desenvolver novos métodos de captação e a otimizar o aproveitamento da água de chuva armazenada em reservatório, a fim de amenizar os problemas ocasionados pela seca (2).bitstream/item/133187/1/32525-1.pdfTrabalho preparado para o Congresso Nacional de Irrigação e Drenagem, Salvador, set. 1978

Quantitative chemical tagging, stellar ages and the chemo-dynamical evolution of the Galactic disc

The early science results from the new generation of high-resolution stellar spectroscopic surveys, such as GALAH and the Gaia-ESO survey, will represent major milestones in the quest to chemically tag the Galaxy. Yet this technique to reconstruct dispersed coeval stellar groups has remained largely untested until recently. We build on previous work that developed an empirical chemical tagging probability function, which describes the likelihood that two field stars are conatal, that is, they were formed in the same cluster environment. In this work we perform the first ever blind chemical tagging experiment, i.e., tagging stars with no known or otherwise discernable associations, on a sample of 714 disc field stars with a number of high quality high resolution homogeneous metal abundance measurements. We present evidence that chemical tagging of field stars does identify coeval groups of stars, yet these groups may not represent distinct formation sites, e.g. as in dissolved open clusters, as previously thought. Our results point to several important conclusions, among them that group finding will be limited strictly to chemical abundance space, e.g. stellar ages, kinematics, colors, temperature and surface gravity do not enhance the detectability of groups. We also demonstrate that in addition to its role in probing the chemical enrichment and kinematic history of the Galactic disc, chemical tagging represents a powerful new stellar age determination technique.Comment: 12 pages, 9 figures, accepted for publication in Monthly Notices of the Royal Astronomical Society (MNRAS