Emergency oil and oil products spills represent a great danger to the environment, including ecosystems, and to the population. New problems of such dangerous spills and methods of early detection ...are discussed in this paper. It is proposed to conduct assessment of biological hazards of such spills on the basis of data on the distribution of individual oil hydrocarbons within the column of the water body and computer predictions of their toxicity. Oil radioactivity, which is associated with uranium and thorium, is seen as the important aspect of the oil spill danger, especially in watercourses. The need for an automated monitoring system for the early detection of oil spills in water bodies is analysed. The proposed system consists of three subsystems. The first remote sensing subsystem is based on powerful fluorescent lidars; experimental results on lidar registration of oil pollution of water are reported. The second subsystem uses a network of automatic monitoring stations with contact detectors. The third subsystem is the combined sensor system based on remote and contact technologies.
A
bstract
We prove that the present experimental constraints are already enough to rule out the possibility of the ∼ 125 GeV Higgs found at LHC being the second lightest Higgs in a general MSSM ...context, even with explicit CP violation in the Higgs potential. Contrary to previous studies, we are able to eliminate this possibility analytically, using simple expressions for a relatively small number of observables. We show that the present LHC constraints on the diphoton signal strength, τ τ production through Higgs and BR(
B
→
X
s
γ) are enough to preclude the possibility of
H
2
being the observed Higgs with
m
H
⋍ 125 GeV within an MSSM context, without leaving room for finely tuned cancellations. As a by-product, we also comment on the difficulties of an MSSM interpretation of the excess in the γγ production cross section recently found at CMS that could correspond to a second Higgs resonance at
m
H
⋍ 136 GeV.
Recently we proposed a framework for explaining the observed evidence for neutrino oscillations without enlarging the neutrino sector, by introducing CPT-violating Dirac masses for the neutrinos. In ...this Letter we continue the exploration of the phenomenology of CPT violation in the neutrino sector. We show that our CPT-violating model fits the existing SuperKamiokande data at least as well as the standard atmospheric neutrino oscillation models. We discuss the challenge of measuring CP violation in a neutrino sector that also violates CPT. We point out that the proposed off-axis extension of MINOS looks especially promising in this regard. Finally, we describe a method to compute CPT-violating neutrino effects by mocking them up with analog matter effects.
The main focus of this work was to evaluate the capabilities of information technology to establish the biological activity of organic xenobiotics on the example of hazardous substances from the list ...of Helsinki commission (HELCOM) aimed at protecting the marine environment of the Baltic Sea from negative impact. These methodological approaches will be used in future for the preliminary assessment of the toxicity of new xenobiotics revealed in Baltic waters.
In this work we update the constraints on tree level FCNC couplings in the framework of a theory with
n isosinglet vector-like down quarks. In this context, we emphasize the sensitivity of the
B→
J/
...ψK
S
CP asymmetry to the presence of new vector-like down quarks. This
CP asymmetry, together with the rare decays
B→X
s,dl
l
̄
and
K→πν
ν
̄
are the best options to further constrain the FCNC tree level couplings or even to point out, in the near future, the possible presence of vector-like quarks in the low energy spectrum, as suggested by GUT theories or models of large extra dimensions at the TeV scale.
We consider a class of models predicting new heavy neutral fermionic states, whose mixing with the light neutrinos can be naturally significant and produce observable effects below the threshold for ...their production. We update the indirect limits on the flavour non-diagonal mixing parameters that can be derived from unitarity, and show that significant rates are in general expected for one-loop-induced rare processes due to the exchange of virtual heavy neutrinos, involving the violation of the muon and electron lepton numbers. In particular, the amplitudes for
μ-
e conversion in nuclei and for
μ →
ee
+
e
− show a non-decoupling quadratic dependence on the heavy neutrino mass
M, while
μ →
eγ is almost independent of the heavy scale above the electroweak scale. These three processes are then used to set stringent constraints on the flavour-violating mixing angles. In all the cases considered, we point out explicitly that the non-decoupling behaviour is strictly related to the spontaneous breaking of the SU(2) symmetry.
Matter effects in neutrino propagation translate into effective parameters for the oscillation and fake CP- and CPT-odd quantities, even in a scenario, such as
Δ
12=0, where no genuine CP violation ...is present. This fact seems to impose severe restrictions on the determination of intrinsic parameters of the system from long-baseline experiments. We show, however, that the resonance in the effective mixing
θ
̃
13
can be observed for a certain range of baselines. This provides a way to measure the vacuum mixing angle
θ
13 and the sign of
Δm
23
2 from atmospheric neutrinos, using a detector with energy resolution and charge discrimination.
In order to accommodate the neutrino oscillation signals from the solar, atmospheric, and LSND data, a sterile fourth neutrino is generally invoked, though the fits to the data are becoming more and ...more constrained. However, it has recently been shown that the data can be explained with only three neutrinos, if one invokes CPT violation to allow different masses and mixing angles for neutrinos and antineutrinos. We explore the nature of neutrinos in such CPT-violating scenarios. Majorana neutrino masses are allowed, but in general, there are no longer Majorana neutrinos in the conventional sense. However, CPT-violating models still have interesting consequences for neutrinoless double beta decay. Compared to the usual case, while the larger mass scale (from LSND) may appear, a greater degree of suppression can also occur.
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