1,929 research outputs found
Freeze-in Dirac neutrinogenesis: thermal leptonic CP asymmetry
We present a freeze-in realization of the Dirac neutrinogenesis in which the
decaying particle that generates the lepton-number asymmetry is in thermal
equilibrium. As the right-handed Dirac neutrinos are produced non-thermally,
the lepton-number asymmetry is accumulated and partially converted to the
baryon-number asymmetry via the rapid sphaleron transitions. The necessary
CP-violating condition can be fulfilled by a purely thermal kinetic phase from
the wavefunction correction in the lepton-doublet sector, which has been
neglected in most leptogenesis-based setup. Furthermore, this condition
necessitates a preferred flavor basis in which both the charged-lepton and
neutrino Yukawa matrices are non-diagonal. To protect such a proper Yukawa
structure from the basis transformations in flavor space prior to the
electroweak gauge symmetry breaking, we can resort to a plethora of model
buildings aimed at deciphering the non-trivial Yukawa structures.
Interestingly, based on the well-known tri-bimaximal mixing with a minimal
correction from the charged-lepton or neutrino sector, we find that a
simultaneous explanation of the baryon-number asymmetry in the Universe and the
low-energy neutrino oscillation observables can be attributed to the mixing
angle and the CP-violating phase introduced in the minimal correction.Comment: 28 pages and 7 figures; more discussions and one figure added, final
version published in the journa
Negative emotion under haze: an investigation based on the microblog and weather records of Tianjin, China
Nowadays, many big cities are suffering from heavy air pollution and continuous haze weather. Compared with the threat on physical health, the influence of haze on people’s mental health is much less discussed in the current literature. Emotion is one of the most important indicators of mental health. To understand the negative impact of haze weather on the emotion of the people, we conducted an investigation based on historical weather records and microblog data in Tianjin, China. Specifically, an emotional thesaurus was generated with a microblog corpus collected from sample data. Based on the thesaurus, the public emotion under haze was statistically described. Then, through correlation analysis and comparative study, the relation and seasonal variation of haze and negative emotion of the public were well discussed. According to the study results, there was indeed a correlation between haze and negative emotion of the public, but the strength of this relationship varied under different conditions. The level of air pollution and weather context were both important factors that influence the mental effects of haze, and diverse patterns of negative emotion expression were demonstrated in different seasons of a year. Finally, for the benefit of people’s mental health under haze, recommendations were given for haze control from the side of government
, and neutrino mass in the 2HDM-III with right-handed neutrinos
Given that the two-Higgs-doublet model of type III (2HDM-III) has the
potential to address the anomalies while the resolution to the
deficits requires new degrees of freedom within this
framework, we consider in this paper a unified scenario where the low-scale
type-I seesaw mechanism is embedded into the 2HDM-III, so as to accommodate the
and anomalies as well as the neutrino mass.
We first revisit the anomalies and find that the current
world-averaged results can be addressed at level without violating
the bound from the branching ratio . The scenario predicts two sub-eV neutrino masses
based on a decoupled heavy Majorana neutrino and two nearly degenerate Majorana
neutrinos with mass around the electroweak scale. For the
anomalies, the same scenario can generate the required Wilson coefficients in
the direction , with
Yukawa couplings for the muon and the top quark.Comment: 32 pages, 4 figures; More discussions and references added, final
version to be published in JHE
Scotogenic Dirac neutrino model embedded with leptoquarks: one pathway to addressing all
If the leptoquarks proposed to account for the intriguing anomalies observed
in the -meson decays, and , as well as in
the anomalous magnetic moment of the muon, , can be embedded into
the scotogenic Dirac neutrino model, all these flavor anomalies, together with
the origin of neutrino masses and the nature of dark matter, would be
potentially addressed in a unified picture. Among the minimal seesaw, one-loop,
and two-loop realizations of the dimension-4 effective operator
for the Dirac neutrino masses, we show that plenty of
diagrams associated with the two-loop realizations of can
support the coexistence of leptoquarks and dark matter candidates. After a
simple match of these leptoquarks to those that can accommodate all the flavor
anomalies, we establish the scotogenic Dirac neutrino models embedded with
leptoquarks, which could address all the problems mentioned above.Comment: 17 pages, 16 tables, 9 figure
Apocynin Improves Insulin Resistance through Suppressing Inflammation in High-Fat Diet-Induced Obese Mice
We investigated the effects of apocynin on high-fat diet- (HFD-) induced insulin resistance in C57BL/6 mice. After 12 weeks of HFD, the mice that exhibited insulin resistance then received 5 weeks of apocynin (2.4 g/L, in water). Following apocynin treatment, fasting glucose, insulin, and glucose tolerance test showed significant improvement in insulin sensitivity in HFD-fed mice. We demonstrated that serum levels of tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), and leptin were remarkably reduced with apocynin treatment. We also found that mRNA expression of TNF-α, IL-6, and monocyte chemoattractant protein-1 (MCP-1) in the liver and mRNA expression of TNF-α, IL-6, MCP-1, and leptin in adipose tissue were suppressed by apocynin. Furthermore, the activity of transcription factor NF-κB in the liver was significantly suppressed with apocynin treatment. These results suggest that apocynin may reduce inflammatory factors in the blood, liver, and adipose tissue, resulting in amelioration of insulin resistance in HFD-fed mice
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