Rayat Institute of Engineering and Information Technology

Punjab, India

Rayat Institute of Engineering and Information Technology

Punjab, India

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Verma R.,Rayat Institute of Engineering and Information Technology
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2013

Implications of the lepton mixing angles, in particular of θ13, have been investigated for minimal as well as non-minimal Fritzsch-like textures for the case of Majorana neutrinos. Both, in minimal texture (texture 6 zero lepton mass matrices) and non-minimal textures (two cases of texture 5 zero lepton mass matrices), inverted hierarchy and degenerate scenario of neutrino masses have been ruled out. The implications of θ13 have been investigated on the lightest neutrino mass mν1 as well as the effective Majorana mass 〈mee〉. © 2013 Elsevier B.V.


Verma R.,Rayat Institute of Engineering and Information Technology
International Journal of Modern Physics A | Year: 2010

A detailed investigation of all possible textures of Fritzsch-like and non-Fritzsch-like, 144 for texture 6 zero and 432 for texture 5 zero mass matrices, have been carried out to ascertain their compatibility with the existing quark mixing data. It seems that all the texture 6 zero possibilities are completely ruled out whereas in the case of texture 5 zero mass matrices the only viable possibility looks to be that of Fritzsch-like. © 2010 World Scientific Publishing Company.


Verma R.,CAS Institute of High Energy Physics | Verma R.,Rayat Institute of Engineering and Information Technology | Zhou S.,CAS Institute of High Energy Physics | Zhou S.,Peking University
European Physical Journal C | Year: 2016

In this paper, we extend the Fritzsch ansatz of quark mass matrices while retaining their hierarchical structures and show that the main features of the Cabibbo–Kobayashi–Maskawa (CKM) matrix V, including |Vus|≃|Vcd|, |Vcb|≃|Vts| and |Vub|/|Vcb|<|Vtd|/|Vts|, can be well understood. This agreement is observed especially when the mass matrices have non-vanishing (1, 3) and (3, 1) off-diagonal elements. The phenomenological consequences of these for the allowed texture content and gross structural features of ‘hierarchical’ quark mass matrices are addressed from a model-independent prospective under the assumption of factorizable phases in these. The approximate and analytical expressions of the CKM matrix elements are derived and a detailed analysis reveals that such structures are in good agreement with the observed quark flavor mixing angles and the CP-violating phase at the 1 σ level and call upon a further investigation of the realization of these structures from a top–down prospective. © 2016, The Author(s).


Verma R.,Rayat Institute of Engineering and Information Technology
Journal of Physics G: Nuclear and Particle Physics | Year: 2013

The phenomenology of the most general quark mass matrices with a minimum of three texture zeros obtained through weak basis (WB) transformations has been discussed within the framework of the standard model. The relationship between the textures, naturalness and WB transformations has also been studied. Adopting a 'hierarchical' parameterization for the quark mass matrix, we have detailed exact relations for the various elements of the quark mixing matrix along with the CP asymmetry angle β, illustrating the explicit relationship between the observed hierarchies among the WB quark mass matrices and the quark mixing matrix. Besides exploring the complete parameter space available to the (M q)11, (q = u, d) elements in these mass matrices, their implications for quark mixing data and CP violation asymmetries have also been explored. © 2013 IOP Publishing Ltd.


Verma R.,Rayat Institute of Engineering and Information Technology
International Journal of Modern Physics A | Year: 2014

A systematic analysis of the textures arising in lepton mass matrices have been carried out using unitary transformations and condition of naturalness for the Dirac and Majorana neutrino possibilities. It is observed that the recent three neutrino oscillation data together with the effective mass in neutrinoless double beta decay provide vital clues in predicting the general structures of these lepton mass matrices. © 2014 World Scientific Publishing Company.


Mishra V.D.,Snow and Avalanche Study Establishment SASE | Sharma J.K.,Rayat Institute of Engineering and Information Technology | Khanna R.,Thapar University
Annals of Glaciology | Year: 2010

The topographic effects of differential terrain illumination in optical satellite imagery of rugged mountainous regions have serious consequences for qualitative and quantitative analysis for various snow applications. Therefore, effective removal or minimization of topographic effects is necessary in satellite image data of mountainous regions. Different methods for topographic corrections, including C-correction, Minnaert corrections (including slope) and slope-matching method, are analysed in the context of snow reflectance. Combination of dark-object subtraction models DOS1 and DOS3 is used for image-based atmospheric corrections while considering the effect of Rayleigh scattering on the transmissivity in different spectral bands of AWiFS and MODIS image data. The performance of different models is evaluated using (1) visual analysis, (2) change in snow reflectance on sunny and shady slopes after the corrections, (3) validation with in situ observations and (4) graphical analysis. The results show that the slope-matching technique could eliminate most of the shadowing effects in Himalayan rugged terrain and correctly estimate snow reflectance from AWiFS and MODIS imagery. The validation of results with in situ observations for both types of imagery suggests that all other methods significantly underestimate reflectance values after the corrections.


Verma R.,Rayat Institute of Engineering and Information Technology
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2013

The phenomenology of the most general lepton mass matrices obtained through weak basis transformations has been discussed. Using a hierarchical parametrization of these mass matrices, the exact relations for lepton mixing angles have been obtained assuming normal neutrino mass hierarchy and natural structures of lepton mass matrices. The recent three neutrino oscillation data together with the condition of naturalness on the Dirac lepton mass matrices provide a lower bound on the lightest neutrino mass of mv1>3 meV along with a nonvanishing Dirac CP violating phase. © 2013 American Physical Society.


Verma R.,Rayat Institute of Engineering and Information Technology | Ahuja G.,Panjab University | Mahajan N.,Panjab University | Randhawa M.,Panjab University | Gupta M.,Panjab University
Journal of Physics G: Nuclear and Particle Physics | Year: 2010

We have attempted to extend the parameter space of the elements of the texture four-zero Hermitian quark mass matrices, to include the case of 'weak hierarchy' amongst them along with the usually considered 'strong hierarchy' case. This has been carried out by giving wide variation to the hierarchy defining parameters DU and DD, having implications for the structural features of the mass matrices. We find that not only are the weakly hierarchical mass matrices able to reproduce the strongly hierarchical mixing angles but also both the phases, having their origin in the mass matrices, have to be non-zero to achieve compatibility of these matrices with recent quark mixing data. Further noting the difference between the exclusive and inclusive values of Vub, we have carried out separate analyses corresponding to these. © 2010 IOP Publishing Ltd.


Sharma J.K.,Rayat Institute of Engineering and Information Technology | Mishra V.D.,Snow and Avalanche Study Establishment SASE | Khanna R.,Thapar University
Journal of the Indian Society of Remote Sensing | Year: 2013

The present paper discusses the impact of topography on accuracy for land cover classification and "from-to class change using improved spectral change vector analysis suggested by Chen et al. (2003). Two AWiFS sensor images of different dates are used. Double Window Flexible Pace Search (DFPS) is used to estimate threshold of change magnitude for change/no change classes. The topographic corrections show accuracy of 90% (Kappa coefficient 0.7811) for change/no change area as compared to 82% (Kappa coefficient 0.6512) in uncorrected satellite data. Direction cosines of change vector for determining change direction in n-dimensional spectral space is used for image classification with a minimum distance categorizing technique. The results of change detection are compared (i) Improved CVA with conventional two bands CVA and (ii) Improved CVA before and after topographic corrections. The improved CVA with topographic correction consideration using slope match show maximum accuracy of 90% (Kappa coefficient 0.83) as compared to conventional CVA which show maximum accuracy of 82% (Kappa coefficient 0.6624). The overall accuracy of "from- to class using improved CVA increases from 86% (Kappa coefficient 0.7817) to 90% (Kappa coefficient 0.83) after topographic corrections. The improved CVA with proper topographic corrections is found to be effective for change detection analysis in the rugged Western Himalayan terrain. © 2012 Indian Society of Remote Sensing.


Verma R.,Rayat Institute of Engineering and Information Technology
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2014

Several intriguing aspects of neutrino oscillation phenomenology like the origin of small neutrino masses, the absolute neutrino mass scale, the neutrino mass hierarchy, i.e., normal or inverted, and the nature of neutrinos, i.e., Dirac or Majorana, etc. have been addressed from a general perspective. We show how the fundamental considerations of unitary transformations, naturalness, and the seesaw mechanism suffice to determine the texture structure of fermion Yukawa couplings and discuss the significance of the effective mass in 0νββ decay for the texture structure of these couplings. © 2014 American Physical Society.

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