D K Choudhury
Articles written in Pramana – Journal of Physics
Volume 60 Issue 3 March 2003 pp 563-567
The exponent λ (
The exponent λ of the structure function F_{2} ∼
Volume 61 Issue 5 November 2003 pp 979-985
Transversity of quarks in a nucleon
The transversity distribution of quarks in a nucleon is one of the three fundamental distributions, that characterize nucleon's properties in hard scattering processes at leading twist (twist 2). It measures the distribution of quark transverse spin in a nucleon polarized transverse to its (infinite) momentum. It is a chiral-odd twist-two distribution function — gluons do not couple to it. Quarks in a nucleon/hadron are relativistically bound and transversity is a measure of the relativistic nature of bound quarks in a nucleon. In this work, we review some important aspects of this less familiar distribution function which has not been measured experimentally so far.
Volume 65 Issue 2 August 2005 pp 193-213
At low
Volume 75 Issue 3 September 2010 pp 423-438 Research Articles
Bhaskar Jyoti Hazarika D K Choudhury
We used variationally improved perturbation theory (VIPT) in calculating the slope and curvature of Isgur–Wise (I–W) function with the Cornell potential $− \dfrac{4\alpha_{s}}{3r} br + c$ instead of the usual stationary state perturbation theory as done earlier. We used $−(4\alpha_{s} /3r)$, i.e. the Coulombic potential, as the parent and the linear one, i.e. $br +c$ as the perturbed potential in the theory and calculated the slope and curvature of Isgur–Wise function including three states in the summation involved in the first-order correction to wave function in the method.
Volume 78 Issue 4 April 2012 pp 555-564 Research Articles
Bhaskar Jyoti Hazarika D K Choudhury
We have recently reported the calculation of slope and curvature of Isgur–Wise function based on variationally improved perturbation theory (VIPT) in a quantum chromodynamics (QCD)-inspired potential model. In that work, Coulombic potential was taken as the parent while the linear one as the perturbation. In this work, we choose the linear one as the parent with Coulombic one as the perturbation and see the consequences.
Volume 79 Issue 4 October 2012 pp 833-837 Poster Presentations
Non-singlet spin structure function $g^{NS}_{1} (x,t)$ in the DGLAP approach
Neelakshi N K Borah D K Choudhury P K Sahariah
An analytical solution of the non-singlet polarized parton distribution $\Delta q^{NS} (x, Q^{2}) = (\Delta u(x, Q^{2}) − \Delta d(x, Q^{2}))$ is obtained by solving the DGLAP (Gribov and Lipatov,
Volume 79 Issue 6 December 2012 pp 1385-1393
Open flavour charmed mesons in a quantum chromodynamics potential model
Krishna Kingkar Pathak D K Choudhury
We modify the mesonic wave function by using a short distance scale $r_{0}$ in analogy with hydrogen atom and estimate the values of masses and decay constants of the open flavour charm mesons 𝐷, $D_{s}$ and $B_{c}$ within the framework of a
Volume 84 Issue 1 January 2015 pp 69-85
Bhaskar Jyoti Hazarika D K choudhury
We use variationally improved perturbation theory (VIPT) for calculating the elastic form factors and charge radii of $D$, $D_{s}$, $B$, $B_{s}$ and $B_{c}$ mesons in a quantum chromodynamics (QCD)-inspired potential model. For that, we use linear-cum-Coulombic potential and opt the Coulombic part first as parent and then the linear part as parent. The results show that charge radii and form factors are quite small for the Coulombic parent compared to the linear parent. Also, the analysis leads to a lower as well as upper bounds on the four-momentum transfer $Q^{2}$, hinting at a workable range of $Q^{2}$ within this approach, which may be useful in future experimental analyses. Comparison of both the options shows that the linear parent is the better option.
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