Dark Matter and Collider Searches in S3S_3-Symmetric 2HDM with Vector Like Leptons

We study the $S_3$-symmetric two Higgs doublet model by adding two generations of vector like leptons (VLL) which are odd under a discrete $Z_2$ symmetry. The lightest neutral component of the VLL acts as a dark matter (DM) whereas the full VLL set belongs to a dark sector with no mixings allowed with the standard model fermions. We analyse the model in light of dark matter and collider searches. We show that the DM is compatible with the current relic density data as well as satisfying all direct and indirect dark matter search constraints. We choose some representative points in the model parameter space allowed by all aforementioned dark matter constraints and present a detailed collider analysis of multi-lepton signal viz. the mono-lepton, di-lepton, tri-lepton and four-lepton along with missing transverse energy in the final state using both the cut-based analysis and multivariate analysis respectively at the high luminosity 14 TeV LHC run.Comment: 51 Pages, 10 Captioned figures and 20 Tables, minor changes made in the manuscript, version accepted for publication in The European Physical Journal C journa

Unveiling the reactions of triethylphosphite and its diethylamino substituted derivatives to carbon tetrachloride with a molecular electron density theory perspective

127-135A molecular electron density theory study is presented herein for the reactions of triethylphosphite (TEP) and its diethylamino substituted derivatives (DEAP and MEAP) to carbon tetrachloride (CCl4). Analysis of the Electron localization function (ELF) has allowed characterizing the electronic structure of the reagents and the conceptual density functional theory (CDFT) study predicted the polar character of the reactions with the electronic flux from TEP, DEAP and MEAP to CCl4. Analysis of the relative energies along the potential energy surfaces has indicated energetically favoured attack on the chlorine atom of CCl4 relative to that on the carbon atom and the reactions became energetically more facile due to introduction of the electron donating diethylamino substituent. This allowed formulating the heterolytic mechanism of the reactions in which the quick exchange of CCl3- with the chlorine atom takes place for TEP, while the exchange is sloweddown in DEAP and MEAP due to mesomeric stabilization of the phosphonium ion. The ELF and Atoms in molecules (AIM) studies indicated early transition states (TSs) with no new covalent bond formation, and the non-covalent interactions at the interatomic bonding regions of the TSs are analysed from the Independent Gradient Model (IGM) analysis based on the Hirshfield partition of electron density

Modelling of Stand –Alone Wind Energy Conversion System using Fuzzy Logic Controller

Abstract: The concern for environment due to the ever increasing use of fossil fuels and rapid depletion of the conventional sources of energy has led to the development of alternative sources of energy. Wind energy, the kinetic energy associated with movement of large masses of air, is an inexhaustible source of energy which generates electricity without harming our environment. But it is unreliable energy source as wind conditions are uncertain and unpredictable. This paper focuses on developing a fuzzy logic controller based Stand-Alone Wind Energy Conversion System, where this controller manages power production and power storage according to wind conditions & load demand. This proposed system will help us to get a smooth AC output voltage to supply to fixed Load under any wind speed. The effectiveness of the proposed system for its application in autonomous wind energy system is verified with simulation results, which is carried out using MATLAB

Microenvironmental constraint on δ13C depletion : Garudamangalam Sandstone, Cauvery Basin, India

Within the hydrocarbon-producing Cretaceous marine Uttatur Group, Cauvery Basin, India, the Garudamangalam Sandstone Formation is at top of a TST-HST transit. The δ13C value is expectedly depleted within the calcareous Garudamangalam Sandstone, which is the top most unit of the Uttatur Group, overlying the Karai Shale. The calcareous sandstone was deposited in a coastal setting around a shore-parallel river mouth bar. Instances of excessive depletion of δ13C up to −44.5‰ in the carbonate cement is suggestive of methane generation and its subsequent sequestration. The common occurrence of early diagenetic pyrite in these rocks testifies to the proliferation of sulfate-reducing bacteria and is suggestive of methane generation beneath the sulfate reduction zone. Upward-moving diffusive methane was possibly consumed by methanotrophs at the base of the sulfate-reduction zone. Abundant fabric-selective carbonate cement corroborates microbially-controlled anaerobic oxidation of methane. The presumed high rate of nutrient supply, abundance of vegetative material and moderately high organic carbon content in sediments (av. 1.6%), support this contention. All the samples which have the greatest δ13C depletion are characterized by enriched organic carbon and are derived from a tidal inlet-mouth facies, and selectively from mud drapes on cross-bedding in tidal strata. Calcarenite at the base of the same cross-strata are invariably much less depleted in δC13. This range of relationships indicates the transport of methanotrophs that settled on foreset beds mostly as tides slackened under the broader control of neap-spring cycles.SS acknowledges the Centre of Advance Study (CAS Phase V) and University with Potential for Excellence (UPE II) programmes of Jadavpur University. Geochemical work was carried out at the National Stable Isotope Facility of IIT, Kharagpur and IISER, Kolkata.http://www.elsevier.com/locate/marpetgeo2019-03-01hj2018Geolog

Unveiling the reactions of triethylphosphite and its diethylamino substituted derivatives to carbon tetrachloride with a molecular electron density theory perspective

A molecular electron density theory study is presented herein for the reactions of triethylphosphite (TEP) and its diethylamino substituted derivatives (DEAP and MEAP) to carbon tetrachloride (CCl4). Analysis of the Electron localization function (ELF) has allowed characterizing the electronic structure of the reagents and the conceptual density functional theory (CDFT) study predicted the polar character of the reactions with the electronic flux from TEP, DEAP and MEAP to CCl4. Analysis of the relative energies along the potential energy surfaces has indicated energetically favoured attack on the chlorine atom of CCl4 relative to that on the carbon atom and the reactions became energetically more facile due to introduction of the electron donating diethylamino substituent. This allowed formulating the heterolytic mechanism of the reactions in which the quick exchange of CCl3- with the chlorine atom takes place for TEP, while the exchange is slowed down in DEAP and MEAP due to mesomeric stabilization of the phosphonium ion. The ELF and Atoms in molecules (AIM) studies indicated early transition states (TSs) with no new covalent bond formation, and the non-covalent interactions at the interatomic bonding regions of the TSs are analysed from the Independent Gradient Model (IGM) analysis based on the Hirshfield partition of electron density

A study on health risk behavior of mid-adolescent school students in a rural and an urban area of West Bengal, India

Background and Objective: High-risk behaviors can have adverse effects on health of adolescents. It is essential to identify risks so that modification can be initiated before any damage. The present study was conducted among adolescents to study their risk behaviors. Materials and Methods: This cross-sectional descriptive study based on the concept of Global School-based Student Health Survey was conducted by interviewing adolescents of one urban and one rural randomly selected school. For quick overall assessment of their risk behaviors, a predesigned three-point scoring system was followed. Data were analyzed using Epi Info version 3.5.1. Results: The study of six domains of important risk behaviors among 788 school-going adolescents (rural: 436 [55.3%], urban: 352 [44.7%]), (male: 406 [51.5%], female: 382 [48.5%]) revealed that occurrence of dietary high-risk behavior was more in urban students (11.4%) than rural students (1.8%). Regarding violence, occurrence of high-risk behavior was also higher among urban students (18.8% vs. 6%). The number of mentally disturbed girls is more than boys. Conclusion: The mean risk scores in all domains, except personal hygiene, are either in ′Moderate′ or ′high′ risk grade. It is of great concern that rural and urban, male and female adolescents are at risk though their vulnerability varies

Signals for vector-like leptons in an

In this work, we explore the signals of an $$S_3$$-symmetric two Higgs doublet model with two generations of vector-like leptons (VLLs) at the proposed International Linear Collider (ILC). The lightest neutral component of the VLL in this model provides a viable dark matter (DM) candidate satisfying the current relic density data as well as circumventing all direct and indirect DM search constraints. Some representative benchmark points have been selected with low, medium and high DM masses, satisfying all theoretical and experimental constraints of the model and constraints coming from the DM sector. The VLLs (both neutral and charged) will be produced in pair leading to multi-lepton and multi-jet final states. We show that the ILC will prove to be a much more efficient and useful machine to hunt for such signals compared to LHC. Using traditional cut-based analysis as well as sophisticated multivariate analysis, we perform a detailed analysis of some promising channels containing mono-lepton plus di-jet, di-lepton, four-lepton and four jets along with missing transverse energy in the final state at 1 TeV ILC