We study the twist-2 distribution amplitudes (DAs) and the decay constants of pseudoscalar light (π, K) and heavy (D, D s , B, B s ) mesons as well as the longitudinally and transversely polarized vector light (s ) mesons in the light-front quark model with the Coulomb plus exponential-type confining potential V exp = a + be αr in addition to the hyperfine interaction. We first compute the mass spectra of ground state pseudoscalar and vector light and heavy mesons and fix the model parameters necessary for the analysis, applying the variational principle with the trial wave function up to the first three lowest order harmonic oscillator (HO) wave functions Φ(x, k ⊥ ) = 3 n=1 c n φ nS . We then obtain the numerical results for the corresponding decay constants of light and heavy mesons. We estimate the DAs, analyze their variation as a function of momentum fraction and compute the first six ξ-moments of the B and D mesons as well. We compare our results with the available experimental data as well as with the other theoretical model predictions.
We have studied the decay constants of the pseudoscalar and the vector B and D mesons in the framework of the light-cone quark model. We have applied a variational method to the relativistic Hamiltonian with the Gaussian-type trial wave function to obtain the values of the scale parameter β in different potential models. Furthermore, using the known values of the constituent quark masses of u, d, s, c and b quarks, we have obtained the numerical results for the decay constants. We have also compared our results with the other theoretical calculations and the existing experimental results. The present work predictions have many phenomenological applications in the domain of CP violation and also in the determination of the CKM matrix elements.
We study the decay constants of pseudoscalar and vector B meson in the framework of light-cone quark model (LCQM). We apply the variational method to the relativistic Hamiltonian with the Gaussian-type trial wave function to obtain the values of β (scale parameter). Then with the help of known values of constituent quark masses, we obtain the numerical results for the decay constants f P and f V , respectively. We compare our numerical results with the existing experimental data.
In this work shows microstrip patch antenna is introduced, associated with circular polarization. To generate circular polarized radiation along with several feeding techniques is reviewed in this paper. Because of we get better polarization matching in between transmitting and receiving that is why it is very effective circular polarization technique. Circular polarized antennas are increasingly gaining importance in wireless communication. This paper also presents literature survey of Circular Polarization techniques for design of Microstrip Patch Antenna for wireless Communication.
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