14,307 research outputs found
Realizing the supersymmetric inverse seesaw model in the framework of R-parity violation
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 and . 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 GeV without resort to heavy stops.Comment: Minor modification of the text. Final version to be published in PL
Gestão ambiental de estabelecimentos rurais no entorno da Reserva Particular do Patrimônio Natural (RPPN) Feliciano Miguel Abdala, MunicÃpio de Caratinga, MG
bitstream/item/25830/1/documentos-80.pd
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 . 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 ( GeV) the BR(
WIMPs) . 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 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 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.
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, municÃpio 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
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