8108447
Analysis of a quark model with charm and color for inclusive processes.
The qqq-bar model of Mitra for meson-baryon processes is reformulated to study inclusive processes incorporating charm and color degrees of freedom. Predictions are made in terms of sum rules for various inclusive cross sections. Agreement of the sum rules with data is good for dsigma/dp/sub perpendicular/ /sup 2/ and dsigma/dx in the available range of p/sub perpendicular/ /sup 2//x. However, overall analysis of the flavor-symmetry breaking indicates that symmetries alone are not adequate and the underlying theory should contain a suitable mechanism to generate Regge-type behavior in the inclusive distributions. We also incorporate proton-wave-function modification due to gluons in our model.
122709605
THE ISGUR–WISE FUNCTION IN AN IMPROVED QCD INSPIRED QUARK MODEL
We calculate the Isgur–Wise function of heavy light mesons and its derivatives — its slope and its curvature, in an improved version of our earlier QCD Inspired Quark Model with two-loop static potential.
118572552
LEPTONIC DECAY OF HEAVY–LIGHT MESONS IN A QCD POTENTIAL MODEL
We study the masses and decay constants of heavy–light flavor mesons D, Ds, B and Bs in a QCD potential model. The mesonic wave function is used to compute the masses of D and B mesons in the ground state and the wave function is transformed to momentum space to estimate the pseudoscalar decay constants of these mesons. The leptonic decay widths and branching ratio of these mesons for different leptonic channels are also computed to compare with the experimental values. The results are found to be compatible with available data.
123275819
On the bounds of CKM matrix element Vcb in a potential model
Considering the allowed range of slope ρ2 and curvature C of Isgur–Wise function for B meson, we obtain an allowed range of strong coupling constant αs as well as the QCD scale parameter Λ in a specific prescription. The allowed range of Λ is then used to obtain the theoretical bounds on Vcb in a potential model. The recent available data of Vcb are found to lie within this computed range 0.0375 ≤|Vcb|≤0.0410.
120091736
An analysis of a quantum chromodynamic structure function
We obtain an approximate solution of Altarelli-Parisi equations yielding a sample of quantum chromodynamic structure function. The SLAC-MIT data are analysed with it. Possible effects of intrinsic charm and higher twist are also included. Agreement is found to be good forx⩾0.25.
118509628
AN ANALYSIS OF THE ISGUR–WISE FUNCTION AND ITS DERIVATIVES WITHIN A HEAVY–LIGHT QCD QUARK MODEL
In determining the mesonic wave function from QCD inspired potential model, if the linear confinement term is taken as parent (with Coulombic term as perturbation), Airy's function appears in the resultant wave function — which is an infinite series. In the study of Isgur–Wise function (IWF) and its derivatives with such a wave function, the infinite upper limit of integration gives rise to divergence. In this paper, we have proposed some reasonable cutoff values for the upper limit of such integrations and studied the subsequent effect on the results. We have also studied the sensitivity of the order of polynomial approximation of the infinite Airy series in calculating the derivatives of IWF.
43720783
Natural parity states of SU(6) x O(3) in baryon spectra: Evidence for (56,odd-) via Delta states.
116150107
Symmetry breaking by a special massless scalar field