A5056771517- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Physics of Superconductivity and Magnetism
- Black Holes and Theoretical Physics
- Advanced Statistical Process Monitoring
- Cosmology and Gravitation Theories
- Nuclear physics research studies
- Rheology and Fluid Dynamics Studies
- Geometric Analysis and Curvature Flows
- X-ray Spectroscopy and Fluorescence Analysis
- Algebraic and Geometric Analysis
- Synthesis and biological activity
- Cold Atom Physics and Bose-Einstein Condensates
- Historical and Architectural Studies
- Health and Conflict Studies
- Indian Economic and Social Development
- Differential Equations and Numerical Methods
- Quantum Mechanics and Applications
- Nonlinear Differential Equations Analysis
- Corporate Governance and Law
- Differential Equations and Boundary Problems
- Agricultural Practices and Plant Genetics
- Eurasian Exchange Networks
- Agricultural Science and Fertilization
Maharaja Sayajirao University of Baroda
2009-2023
Banaras Hindu University
2015
Universitat de València
2005
Jiwaji University
1994-1995
The University of Texas at Austin
1987
Indian Institute of Science Bangalore
1987
Indian Institute of Technology Kanpur
1983-1985
We make a theoretical study of the $s$-wave interaction nonet vector mesons with octet pseudoscalar starting from chiral invariant Lagrangian and implementing unitarity in coupled channels. By looking for poles unphysical Riemann sheets unitarized scattering amplitudes, we get two octets one singlet axial-vector dynamically generated resonances. The found can be associated most low lying resonances quoted by Particle Data Group: ${b}_{1}(1235)$, ${h}_{1}(1170)$, ${h}_{1}(1380)$,...
The magnetic moment of the \ensuremath{\Lambda} hyperon is calculated using QCD sum-rule approach Ioffe and Smilga. It shown that ${\ensuremath{\mu}}_{\ensuremath{\Lambda}}$ has structure ${\mathrm{\ensuremath{\mu}}}_{\mathrm{\ensuremath{\Lambda}}}$=(2/3(${\mathrm{e}}_{\mathrm{u}}$+${\mathrm{e}}_{\mathrm{d}}$+${4\mathrm{e}}_{\mathrm{s}}$)(e\ensuremath{\Elzxh}/${2\mathrm{M}}_{\mathrm{\ensuremath{\Lambda}}}$c)(1+${\mathrm{\ensuremath{\delta}}}_{\mathrm{\ensuremath{\Lambda}}}$), where...
We correct and update our previous publication on the determination of baryon magnetic moments by QCD sum-rule method. New ${m}_{s}$ correction terms are included as well contributions from infrared-divergent diagrams.
Field experiments were carried out to study the population fluctuation of phytophagous mite (Tetranychus urticae Koch) in okra and its relation with different weather variables during 2010 2011crop seasons under unprotected conditions Varanasi region. The results revealed that commenced from 9th 10th standard week 2011 respectively. highest mites per 2.5cm2 leaf area was recorded on 21st (47.75) while maximum 18th (45.99) 2011. It found infestation heavy May both years. number predatory 15th...
It is shown that in theories which chiral symmetry breaks dynamically, quarks can have a rather large anomalous magnetic moment. This has been first shown, as an example, modified Nambu--Jona-Lasinio model. Next, using light-quark dynamical masses QCD, derived and used by various authors, the moment calculated. done one-gluon-exchange approximation nonsingular or singular form of gluon propagator consistent way. found not all forms quark give sensible results. Finally, some phenomenological...
Correlators of singlet and octet axial currents, as well anomaly pseudoscalar densities have been studied using QCD sum rules. Several these rules are used to determine the couplings ${f}_{\ensuremath{\eta}}^{8}$, ${f}_{\ensuremath{\eta}}^{0}$, ${f}_{{\ensuremath{\eta}}^{\ensuremath{'}}}^{8}$ ${f}_{{\ensuremath{\eta}}^{\ensuremath{'}}}^{0}$. We find mutually consistent values which also in agreement with phenomenological obtained from data on various decay production rates. While most by us...
We decompose various quark–gluon Fock states of a nucleon in set which each the three-quark core and rest stuff, termed as sea, appears with definite spin colour quantum number, their weights being determined, statistically, from multiplicities. The expansion coefficients state have been taken recently proposed statistical model. also considered two modifications this model view to reducing contributions sea components higher With certain approximations, we calculated quark nucleon, ratio...
Coupling constants of η and η′ mesons with nucleons have been calculated using the method QCD sum rules. Starting from vacuum-to-meson correlation function interpolating fields two nucleons, its matrix element respect to nucleon spinors has considered. at physical points estimated extrapolation results obtained other points. Anomalous glue found give substantial contribution coupling also accounts for a significant OZI-rule violation.
Matrix elements of flavor-diagonal light quark pseudoscalar densities and axial anomaly operators between vacuum $\ensuremath{\eta}$ ${\ensuremath{\eta}}^{\ensuremath{'}}$ meson states have been determined. This has done by evaluating current-current correlators octet-octet octet-singlet currents using QCD sum rules. The numerical values obtained for the matrix compare well with those in current literature.
We study the $\eta$NN coupling constant using method of QCD sum rules starting from vacuum-to-eta correlation function interpolating fields two nucleons. The matrix element this has been taken with respect to nucleon spinors avoid unwanted pole contribution. SU(3)-flavor symmetry breaking effects have accounted for via $\eta$-mass, s-quark mass and eta decay leading order. Out four obtained by taking ratios in conjunction mass, three are found give mutually consistent results. find SU(3)...
UsingQCD sum rule, we calculate valance quark distribution functions of and in chiral limit.Extrapolating the calculated at both end regions, their first two moments have been compared with those other hadrons.
The anomaly-anomaly correlator is studied using QCD sum rules. Using the matrix elements of anomaly between vacuum and pseudoscalars $\pi, eta$ $\eta'$, derivative $chi'(0)$ evaluated found to be $\approx 1.82 \times 10^{-3}$ GeV$^2$. Assuming that $\chi'(0)$ has no significant dependence on quark masses, mass $\eta'$ in chiral limit $\approx$723 MeV. same calculation also yields for singlet pseudoscalar decay constant a value 178$
The mass spectra of strange baryons in the octet family are investigated a finite-energy QCD sum rule approach based on Gauss-Weierstrass transform. phenomenological form spectral function is saturated by ground state and two lowest excited states, considered as having opposite parities. Treating ground-state parameters known quantities, masses, widths, couplings to interpolating fields determined compared with experiment.
We have analyzed axial-vector current–current correlation functions between one-nucleon states to calculate the singlet coupling constant of nucleon. The octet–octet and octet–singlet current correlators, investigated in this work, do not require any use instanton effects. QCD hadronic parameters used for evaluation correlators been varied by (10–20)%. value nucleon obtained from analysis is consistent with its determination experiments theory.
The spectrum of the proton and its excited states has been investigated in a finite-energy QCD sum rule approach using Gauss-Weierstrass transform. imaginary part polarization operator current saturated by two lowest-lying states. In evaluation quark gluon fields, perturbative corrections have also incorporated. By taking various moments spectral function, total eight rules obtained. masses proton, their widths, coupling constant, with these evaluated. addition, contributions all to...