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Farida Tahir

Publications and source records attributed to Farida Tahir.

At least 19 recordsLinked to original sources
arXiv2024

The 3-3-1 model with exotic electric charges, right-handed neutrinos with type-I+II seesaw mechanism and its effects on LFV

In this research, we propose a modified version of the 3-3-1 model, incorporating a type I+II seesaw mechanism and Z4 discrete symmetry, as a framework for investigating lepton flavor-violating (LFV) decays. This model successfully yields the left-handed neutrinos mass square difference in the eV scale, with specific values of mass square differences; and generates mixing angles that align with experimental data. Furthermore, we develop SARAH and SPheno algorithms tailored for our modified model, enabling us to estimate the magnitude of LFV observables. Our calculations indicate favorable results for various LFV branching ratios. These findings demonstrate improved agreement with experimental measurements compared to previously reported results, which typically fall within the range of 10^-2 to 10^-6.

hep-ph↗
arXiv2022

Electron-Neutrino Scattering a Strong Aspirant for Precision Measurements

This work focuses on the study of electron and neutrino scattering in the frame work of physics beyond the standard model (SM) called new physics (NP). Both Model Independent (MI) and Model Depen-dent (MD) ways are used to constrain NP. R-parity violating Supersymmetry ( /Rp SUSY) Model is used to perform MD analysis, where the scattering cross-section is infuenced by new s-bosons. For MI way non-standard neutrino intections (NSI) are used where there is no need of introducing any new particle. LSND and LAMPF-E225 data is used to identify the physically allowed and forbidden regions for nonunivarsal NSI parameters and nonunivarsal SUSY parameters. Similarly, CHARM-II, BNL-COL and BNL-E734 experimental is used to explore allowed and forbidden regions and limits are established. Furthermore, we establish a relationship between MI and MD coupling parameters.

hep-ph↗
arXiv2021

Study of Nonstandard Interactions in Rare Decays of Hyprons with Missing Energy

We study rare decays of hyperons involving di-neutrinos in the final state in the standard model and compare them with other models. It is claimed that the branching ratio calculated in this article are 2 times the values of 331 model and exceptionally large than the previously calculated values. We explore the nonstandard neutrino interactions (NSI) and constrain NSIs free parameter with these decays. We obtain stringent bounds on of O(0.01). We show that branching ratios (Br) could be in the range of BES III if constraints are O(0.3).

hep-ph↗
arXiv2021

Predictive Theory of Neutrino Masses

In our recent paper [1] we formulated a predictive theory of neutrino masses by considering the interaction between the infrared sector of the effective theory of quantum gravity and the standard model fields. This allowed us to calculate, for the first time in the history of neutrino physics, the absolute scale of neutrino masses. From this theoretical framework, we obtained quantum-gravitational couplings/effective Majorana dimensionless couplings from the spherically symmetric vacuum solutions arising from the Bose-Einstein statistical modification to gravitation. In the present paper, we show that the same solutions can be obtained directly from the quantum interpretation of gravitational radiation arising from the thermodynamic modification to gravitation. Within this theoretical scheme, we show that the single-field inflationary model, GUTs, dark energy and matter-independent gravitational field of vacuum are all connected to the neutrino mass model.

physics.gen-ph↗
arXiv2017

Absolute values of nonstandard interaction parameters in ν_{e}e and ν_{e}e-scatterings

We present a novel approach for constraining nonstandard neutrino interaction (NSI) coupling parameters (ε_{ee}^{eL} and ε_{ee}^{eR}) in low energy flavor conserving ν_{e}e and ν_{e}e-scattering processes. Here we exploit an important phenomenon of interference and assuming that ε_{ee}^{eL} and ε_{ee}^{eR} are same for both the processes as g_{L} and g_{R} in the standard model (SM). Using this approach we obtain the absolute values ε_{ee}^{eL}=8.7x10^-3 and ε_{ee}^{eR}=3.8x10^-1, while the bounds obtained using the said processes are -0.11<ε_{ee}^{eL}<0.13 and 0.35<ε_{ee}^{eR}<0.41. It is noteworthy that the lower bound on ε_{ee}^{eR} exclude the negative region. Furthermore, our bounds on ε_{ee}^{eR} are more stringent than the existing ones.

hep-ph↗
arXiv2017

Study of rare mesonic decays involving di-neutrinos in their final state

We have carried out phenomenological implication of R-parity violating ($\NEG% {R}_{p}$) Minimal Supersymmetric Model (MSSM) via analyses of pure leptonic($% M\rightarrow ν\barν$) and semileptonic decays of pseudo-scalar mesons(% $M\rightarrow Xν\barν$). These analyses involve prediction of branching fraction of pure leptonic decays by using experimental limits/bounds derived from the study of semileptonic decays on $\NEG{R}_{p}$ parameters. We have found, in general that $\NEG{R}_{p}$ contribution dominates over the SM contribution i.e., by a factor of $10^{2}$ for the semleptonic decays of $K^{0}$, $10$ for the pure leptonic decays of $K_{L,S}$ , while $10^{2}~$\& $10^{4}$ in case of $B_{s}$ and $B_{d}$ respectively. This demonstrates the role of $\NEG{R}_{p}$ as a viable model for the study of NP contribution in rare decays.

hep-ph↗
arXiv2017

Path Equations In Absolute Parallelism Space

Riemannian and Absolute Parallelism (AP) geometries are discussed. A lavish treatment of path equations in the AP-space using the Bazanski-type Lagrangian is presented; We write down an expression that is absolutely conserved along a curve in the AP-space and show that it gives the same path equations as obtained using the conventional Lagrangian formalism. We attribute physical interpretations to the resultant path equations and we show that the spin-torsion interaction is an inherent property of the AP-space.

gr-qc↗
arXiv2017

A Single Equation Of Gravity And Electromagnetism On Parallelizable Manifold Using Dolan-McCrea Variational Method

The crucial but undocumented Dolan-McCrea variational method is richly applied. Using the said method, we analytically derived a field equation comprising entirely of geometric structures and we investigate how effectively it describes gravitational and electromagnetic phenomena. The procedure we adopted involved constructing a scalar invariant as was the case for Einstein's General Relativity (GR) except that the scalar of parameterized Absolute Parallelism geometey consists of the Ricci scalar plus an additional term, which is essentially the contortion. %Based on earlier discourse, a good starting point for this section would be the connections of the PAP-space.

gr-qc↗
arXiv2016

Strong Gravity Approach to QCD and General Relativity

A systematic study of the Weyl-type / Yang-Mills-type action possessing local conformal invariance and quadratic curvature is undertaken. The dynamical breaking of this conformal invariance / scale invariance induces general relativity (GR) as an effective long distance limit of the theory. We prove that the corresponding field equations of the theory have the linearly rising potential, which naturally possesses asymptotic freedom and color confinement properties of quantum chromodynamics (QCD). Solutions to the neutrino mass and dark energy problems come as free gifts of this formulation. This approach provides a strong gravity basis for the unification of quantum Yang-Mills theory (QYMT) with Einstein GR.

physics.gen-ph↗
arXiv2015

The study of NSIs in B and KL rare decays with three generations of quarks and interference effects between the standard model and NSIs

We study the rare decays of B meson. We want to constraint the NSIs by using these reactions. We show that there is a strong dependence of these reactions on new physics parameter. We include second and third generation of quarks in the loop for these decays. We further point out that the constraints for second generation are more precise as compared to second and third. We further point out that for inclusive decay, the u quark induce NSIs are giving very very small contribution. We also study KL rare decay to pi zero, neutrino and anti-neutrino. We also study the interference between the standard model and NSIs.

hep-ph↗
arXiv2015

A New Look At Gravitational Coupling Constant And The Dark Energy Problem

In this paper, we establish that the solution to the dark energy problem is connected to the cutoff Ultraviolet scale manifesting itself as linearly independent infrared sectors of the effective theory of gravity interacting with QCD fields. We work in the combined frameworks of finite temperature-density corrections and effective quantum field theory (as low energy quantum gravity). We strongly suggest that the failure to reproduce the exact observed value of dark energy from the framework of Veneziano ghost theory of QCD is intimately linked to the unverifiable ad hoc assumption that conditions the gravitational coupling constant to be unity C Gravity is equal to 0ne. A close perusal of the Minkowski vacuum structure reveals that C Gravity is not equal to one. We compute the value of C Gravity from the Bose-Einstein distribution function. With this value of C Gravity coupled with the value of vacuum energy estimated from the Veneziano ghost theory of QCD, we reproduce the observed value of row lambda to be row lambda congruent to C Gravity. An important prediction of these combined frameworks (made manifest by the application of standard box-quantization procedure to the UV scale Max Planck states that there are to ten raise to power one hundred and twenty two linearly independent "subuniverses" representing the linearly independent infrared sectors of the effective theory of gravity interacting with QCD fields. A direct consequence of this is that our subuniverse is embedded on a non-trivial manifold M such as a torus group T raise to power ten raise to power one hundred and twenty two with different linear sizes.

hep-th↗
arXiv2014

New Physics Through Rare Decays Of Mesons

We study the contribution of 2nd generation of quarks in NSIs. We investigate it through the rare decays of mesons involving neutrinos in the final state. We show the C and s quarks can effect NSIs just like u and s. We explore constraints on free parameter of NSIs. For this purpose we select 6 FCNC semi-leptonic processes of B, D and K mesons having neutrinos in the final state

hep-ph↗
arXiv2014

New Physics from NSIs in charm Decays

We study rare decays of Charm in NSIs. We calculate the NSIs Branching ratios of these decays. There is a strong dependence of these on new physics parameter. They provide, stringent constraints on free parameter in tau.

hep-ph↗
arXiv2011

Nonstandard interactions and interference effect in low energy ν_{e}e-scattering process

We calculated the size and sign of interference (I) in elastic ν_{e}e-scattering process in the presence of nonstandard neutrino interactions (NSI). The size of interference predicted by standard model (SM) is -1.09, while that measured in the LSND experiment is -1.01\pm0.18. Using the current bounds on NSI from the literature,we get I= -1.02, which is compatible with experiment . The result indicates that nonstandard current interferes constructively with the charge and neutral currents (CC and NC) of the SM, while the over all -ev sign (distructive) indicates that the dominant contribution is still from the SM, yet we can not ignore the contribution of NSI, as it enhances our knowledge in terms of known physical phenomena. As an offshoot of this analysis, the best bounds on NSI coupling parameters could be chosen.

hep-ph↗
arXiv2011

Study of semileptonic decays of D_{s} meson within R-parity violating supersymmetric model

We present the comaprative study of semileptonic and leptonic decays of D_{s},D^{\pm} and D^0 meson (D\rightarrowM l_{α}^+l_{β}^-,D\rightarrowl_{α}^+l_{β}^-,D\rightarrowl_{α}^+v_{α};α,β=e,μ) within the framework of R-parity violating (R_{p}) Minimal Supersymmetric Standard Model (MSSM). The comparison shows that combination and product couplings (λ_{βiα}λ_{ijq}^{'\ast} or λ_{βqk}'λ_{αjk}^{'\ast}) contribution to the branching fractions of the said processes rocesses(under consideration) is consistent or comparable to the experimental measurements in most of the cases. However, there exists some cases, where these contributions are suppressed but still comparable to that of standard model.

hep-ph↗
arXiv2009

Some Properties of the Central pi--Meson Carbon Interactions at 40 Gev/C

We discuss some properties of the central pi--meson carbon reactions at 40 GeV/c. While these results were obtained many years ago they have not been explained completely. We attempt to interpret following: results regime change on the behavior of some characteristics of the events as a function of the centrality; anomaly peak on the angular distributions of the slow protons emitted in these reactions; charge asymmetry on the pi--mesons production in the back hemisphere in lcs. Understanding of the results could help to explain the new ones coming from the modern central experiments at high and ultrarelativistic energies.

hep-ex↗