3,939 research outputs found
The inert doublet model of dark matter revisited
The inert doublet model, a minimal extension of the Standard Model by a
second higgs doublet with no direct couplings to quarks or leptons, is one of
the simplest scenarios that can explain the dark matter. In this paper, we
study in detail the impact of dark matter annihilation into three-body final
state on the phenomenology of the inert doublet model. We find that this new
annihilation mode dominates, in a relevant portion of the parameter space, over
those into two-body final states considered in previous analysis. As a result,
the computation of the relic density is modified and the viable regions of the
model are displaced. After obtaining the genuine viable regions for different
sets of parameters, we compute the direct detection cross section of inert
higgs dark matter and find it to be up to two orders of magnitude smaller than
what is obtained for two-body final states only. Other implications of these
results, including the modification to the decay width of the higgs and to the
indirect detection signatures of inert higgs dark matter, are also briefly
considered. We demonstrate, therefore, that the annihilation into three-body
final state can not be neglected, as it has a important impact on the entire
phenomenology of the inert doublet model.Comment: 22 pages, format changed, more detailed discussion in general,
figures and references adde
Effect of Sunflower and Marine Oils on Ruminal Microbiota, In vitro Fermentation and Digesta Fatty Acid Profile
Funding This work has been funded by Consejería de Educación, Junta de Castilla y León (research project LE007A07). Acknowledgments We acknowledge support of the publication fee by the CSIC Open Access Publication Support Initiative through its Unit of Information Resources for Research (URICI). Support received from CICYT project AGL2005-04760-C02-02 is gratefully acknowledged.Peer reviewedPublisher PD
Probing the " from " supersymmetric standard model with displaced multileptons from the decay of a Higgs boson at the LHC
The " from " supersymmetric standard model (SSM) cures the
-problem and concurrently reproduces measured neutrino data by using a set
of usual right-handed neutrino superfields. Recently, the LHC has revealed the
first scalar boson which naturally makes it tempting to test SSM in the
light of this new discovery. We show that this new scalar while decaying to a
pair of unstable long-lived neutralinos, can lead to a distinct signal with
non-prompt multileptons. With concomitant collider analysis we show that this
signal provides an unmistakable signature of the model, pronounced with light
neutralinos. Evidence of this signal is well envisaged with sophisticated
displaced vertex analysis, which deserves experimental attention.Comment: 5 pages, 3 figures, title, text, abstract and references modifie
Hunting physics beyond the standard model with unusual and decays
Nonstandard on-shell decays of and bosons are possible within the
framework of extended supersymmetric models, i.e., with singlet states and/or
new couplings compared to the minimal supersymmetric standard model. These
modes are typically encountered in regions of the parameter space with light
singlet-like scalars, pseudoscalars, and neutralinos. In this letter we
emphasize how these states can lead to novel signals at colliders from - or
-boson decays with prompt or displaced multileptons/tau
jets/jets/photons in the final states. These new modes would give distinct
evidence of new physics even when direct searches remain unsuccessful. We
discuss the possibilities of probing these new signals using the existing LHC
run-I data set. We also address the same in the context of the LHC run-II, as
well as for the future colliders. We exemplify our observations with the "
from " supersymmetric standard model, where three generations of
right-handed neutrino superfields are used to solve shortcomings of the minimal
supersymmetric standard model. We also extend our discussion for other variants
of supersymmetric models that can accommodate similar signatures.Comment: New discussions and references added, 8 pages, 1 figure, matches with
the published version in Phys. Rev.
Looking for the left sneutrino LSP with displaced-vertex searches
We analyze a displaced dilepton signal expected at the LHC for a tau left
sneutrino as the lightest supersymmetric particle with a mass in the range
- GeV. The sneutrinos are pair produced via a virtual , or
in the channel and, given the large value of the tau Yukawa
coupling, their decays into two dileptons or a dilepton plus missing transverse
energy from neutrinos can be significant. The discussion is carried out in the
SSM, where the presence of -parity violating couplings involving
right-handed neutrinos solves the problem and can reproduce the neutrino
data. To probe the tau left sneutrinos we compare the predictions of the SSM with the ATLAS search for long-lived particles using displaced lepton
pairs in collisions at TeV, allowing us to constrain the
parameter space of the model. We also consider an optimization of the trigger
requirements used in existing displaced-vertex searches by means of a High
Level Trigger that exploits tracker information. This optimization is
generically useful for a light metastable particle decaying into soft charged
leptons. The constraints on the sneutrino turn out to be more stringent. We
finally discuss the prospects for the TeV LHC searches as well as further
potential optimizations.Comment: Version published in PRD, discussions expanded, references added, LEP
and LHC constraints discussed in more detail, 29 pages, 9 figures, 9 table
A negative feedback between anthropogenic ozone pollution and enhanced ocean emissions of iodine
Naturally emitted from the oceans, iodine compounds efficiently destroy atmospheric ozone and reduce its positive radiative forcing effects in the troposphere. Emissions of inorganic iodine have been experimentally shown to depend on the deposition to the oceans of tropospheric ozone, whose concentrations have significantly increased since 1850 as a result of human activities. A chemistry-climate model is used herein to quantify the current ocean emissions of inorganic iodine and assess the impact that the anthropogenic increase in tropospheric ozone has had on the natural cycle of iodine in the marine environment since pre-industrial times. Our results indicate that the human-driven enhancement of tropospheric ozone has doubled the oceanic inorganic iodine emissions following the reaction of ozone with iodide at the sea surface. The consequent build-up of atmospheric iodine, with maximum enhancements of up to 70% with respect to pre-industrial times in continental pollution outflow regions, has in turn accelerated the ozone chemical loss over the oceans with strong spatial patterns. We suggest that this ocean-atmosphere interaction represents a negative geochemical feedback loop by which current ocean emissions of iodine act as a natural buffer for ozone pollution and its radiative forcing in the global marine environment.Fil: Prados Roman, C.. Consejo Superior de Investigaciones Científicas. Instituto de Química Física; EspañaFil: Cuevas, Carlos Alberto. Consejo Superior de Investigaciones Científicas. Instituto de Química Física; EspañaFil: Fernandez, Rafael Pedro. Consejo Superior de Investigaciones Científicas. Instituto de Química Física; España. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza; ArgentinaFil: Kinnison, Douglas E.. National Center For Atmospheric Research. Amospheric Chemistry División; Estados UnidosFil: Lamarque, Jean Francoise. National Center For Atmospheric Research. Amospheric Chemistry División; Estados UnidosFil: Saiz-lopez, Alfonso. Consejo Superior de Investigaciones Científicas. Instituto de Química Física; Españ
MoCheQoS: Automated Analysis of Quality of Service Properties of Communicating Systems
We present MoCheQoS, a tool to analyse quality of service (QoS) properties of
message-passing systems. Building on the logic and the choreographic model we
defined in recently published work, MoCheQoS implements a bounded model
checking algorithm. We discuss strengths and weaknesses of MoCheQoS through
some case studies.Comment: 29 page
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