D K Choudhury
Articles written in Pramana – Journal of Physics
Volume 7 Issue 5 November 1976 pp 307-312 Nuclear And Particle Physics
SU(4), broken Zweig rule and the null plane
Using Glauber’s theory of eikonal approximation, an algebraic representation of the broken Zweig rule in the constituent quark model is obtained. Null plane language is then elaborated. It is pointed out that the exotic current associated with the disconnected quark diagrams, which break the Zweig rule, can have canonical dimension.
Volume 7 Issue 5 November 1976 pp 313-315 Nuclear And Particle Physics
Bare quark masses from the transverse cut offs in
From the transverse cuts off of the electron positron annihilation in the SPEAR II regime, we obtain positivity domains of bare quark masses.
Volume 11 Issue 5 November 1978 pp 619-637 Nuclear and Particle Physics
Scale breaking in neutrino scattering
D P Roy S Paranjape P N Pandita D K Choudhury
We consider two types of scale breaking models—one based on asymptotically free gauge theory and the other phenomenological—which have already been fitted to the electron and muon data. Their predictions for the neutrino scattering are worked out and the sensitivity on the model parameters and the input electron data studied. The effects of scale breaking at very low
Volume 28 Issue 1 January 1987 pp 23-34 Particle Physics
Phenomenological structure functions and Gribov-Lipatov relation
We make an analysis of the Gribov-Lipatov relation using the phenomenological forms of the structure function
Volume 29 Issue 4 October 1987 pp 345-350 Quantum Mechanics
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 for
Volume 30 Issue 1 January 1988 pp 35-42 Particle Physics
Gribov-Lipatov inequality and inclusive
We study the inclusive
Volume 31 Issue 6 December 1988 pp 479-491 Particle Physics
We derive an approximate formula for the quark mass in ξ-formalism. Using the QCD-based form of structure function, we analyse the SLAC-MIT data to estimate the experimentally allowed ranges of quark mass. The possible variation of our results with QCD cut-off parameter, gluon distribution, hard intrinsic charm component of the proton wavefunction and the higher twist effects are also discussed.
Volume 33 Issue 3 September 1989 pp 359-364 Particle Physics
An improved approximate solution of Altarelli-Parisi equations
We have presented here an improved solution to Altarelli-Parisi equations, and it is found to be in good agreement with SLAC-MIT data up to
Volume 33 Issue 5 November 1989 pp 555-571 Particle Physics
Bounds on non-leading QCD effects in a quark model for inclusive reactions
We study the possible effect of QCD in the proton wave function in a quark model for inclusive processes
Volume 34 Issue 1 January 1990 pp 85-86 Comments And Addenda
Comment on a solution of Altarelli Parisi equations
We show that the assumptions of factorizability of the structure function
Volume 38 Issue 3 March 1992 pp 313-318
An analysis of quantum chromodynamic structure function beyond leading order
We obtain approximate solutions of Altarelli-Parisi equations beyond leading logarithmic approximation. Our results suggest quantitative utility of higher order terms in the structure function analysis of deep inelastic scattering.
Volume 38 Issue 5 May 1992 pp 481-489 Research Articles
Perturbative and non-perturbative evolutions of structure functions at low-
Approximate solutions of Altarelli-Parisi equations are obtained in low-
Volume 39 Issue 3 September 1992 pp 273-277 Research Articles
Comments on structure functions at low-
We present further analysis of the structure functions at low-
Volume 40 Issue 3 March 1993 pp 213-225
Cross-section sum rules and inequalities in a quark model for light and heavy flavour productions
The$$qq\bar q$$ model for inclusive processes is reformulated to consider the production of heavy flavours (
Volume 41 Issue S1 July 1993 pp 107-125 Standard Model
Volume 43 Issue 2 August 1994 pp 139-153
Perturbative and nonperturbative quark masses in structure functions
Flavour symmetry breaking is introduced in the approximate formula for quark mass reported earlier. We use SLAC-MIT as well as NMC data to estimate the up, down and strange quark masses from structure functions. Using the approximate
Volume 44 Issue 6 June 1995 pp 519-534
Static and dynamic properties of pseudoscalar mesons
D K Choudhury Pratibha Das D D Goswami J K Sarma
We report the results of form factors, charge radii and decay constants of both light and heavy flavoured pseudoscalar mesons in a QCD inspired quark model. We use the quantum mechanical perturbation theory and discuss its limitations in the present problem. Several predictions are also made for bottom and top flavours.
Volume 46 Issue 5 May 1996 pp 349-355
Static and dynamic properties of heavy light mesons in infinite mass limit
We summarize the consequences of the infinite limit of heavy quark mass in the results of form factors, charge radii and decay constants of heavy light mesons within a QCD inspired quark model recently reported.
Volume 87 Issue 4 October 2016 Article ID 0052 Regular
Root mean square radii of heavy flavoured mesons in a quantum chromodynamics potential model
We report the results of root mean square (r.m.s.) radii of heavy flavoured mesons in a QCD model with the potential $V (r) = −(4\alpha_{s}/3r) + br + c$. As the potential is not analytically solvable, we first obtain the results in the absence of confinement and Coulomb terms respectively. Confinement and Coulomb effects are then introduced successively in the approach using the Dalgarno’s method of perturbation. We explicitly consider the following two quantum mechanical aspects in the analysis: (a) The scale factor $c$ in the potential should not effect the wave function of the system even while applying the perturbation theory. (b) Choice of perturbative piece of the Hamiltonian (confinement or linear) should determine the effective radial separation between the quarks and antiquarks. The results are then compared with the available theoretical values of r.m.s. radii.
Volume 88 Issue 3 March 2017 Article ID 0056 Research Article
Isgur–Wise function in a QCD-inspired potential model with WKB approximation
BHASKAR JYOTI HAZARIKA D K CHOUDHURY
We use Wentzel–Kramers–Brillouin (WKB) approximation for calculating the slope and curvature of Isgur–Wise function in a QCD-inspired potential model. This work is an extension of the approximation methods to the QCD-inspired potential model. The approach hints at an effective range of distance for calculating the slope and curvature of Isgur–Wise function. Comparison is also made with those of Dalgarno method and variationallyimproved perturbation theory (VIPT) as well as other models to show the advantages of using WKB approximation.
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