14,307 research outputs found

    Realizing the supersymmetric inverse seesaw model in the framework of R-parity violation

    Get PDF
    If, on one hand, the inverse seesaw is the paradigm of TeV scale seesaw mechanism, on the other it is a challenge to find scenarios capable of realizing it. In this work we propose a scenario, based on the framework of R-parity violation, that realizes minimally the supersymmetric inverse seesaw mechanism. In it the energy scale parameters involved in the mechanism are recognized as the vacuum expectation values of the scalars that compose the singlet superfields N^C\hat N^C and S^\hat S. We develop also the scalar sector of the model and show that the Higgs mass receives a new tree-level contribution that, when combined with the standard contribution plus loop correction, is capable of attaining 125125GeV without resort to heavy stops.Comment: Minor modification of the text. Final version to be published in PL

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

    Get PDF
    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⊗SU(3)L⊗U(1)NSU(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 (MWIMP<60M_{WIMP} < 60 GeV) the BR(H→2H \rightarrow 2 WIMPs) ≳90\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 bbˉb\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 MWIMP>60 M_{WIMP} > 60 GeV, consequently ruling out any attempt to explain the Fermi-LAT observations.Comment: 8 pages, 9 figure

    Estoque de carbono e densidade do solo em cultivo de palma de óleo na Amazônia Oriental.

    Get PDF
    A Palma de óleo é uma importante oleaginosa utilizada na produção de biodiesel, mas ainda são incipientes os resultados do impacto da cultura no estoque de carbono e na densidade do solo na região amazônica. O objetivo deste estudo foi avaliar o efeito da sucessão de floresta secundária em sistemas de palma de óleo, na densidade aparente e armazenamento do estoque de carbono em diferentes locais de coleta em Latossolo Amarelo distrófico. O estudo foi realizado no Nordeste do Pará, município de Tomé-Açu. Foram coletadas amostras de solo nas profundidades de 0-5, 5-10, 10-20 e 20-30 cm de profundidade para análise de carbono total e densidade do solo em quatro locais (coroa, carreador, linha do dendê e pilha) dentro do sistema com palma de óleo com preparo de área mecanizado e comparados com um sistema de referência representado por uma floresta secundária. Os resultados mostraram que as maiores densidades do solo foram encontradas no sistema com palma óleo no carreador até a profundidade de 20 cm. Os maiores estoques de carbono do solo foram observados na profundidade de 0-30 cm na floresta seguido do local coroa na palma de óleo
    • …
    corecore