Jignesh N Pandya
@spuvvn.edu
Professor, Department of Physics
Sardar Patel University
EDUCATION
PhD (Physics)
RESEARCH INTERESTS
Theoretical High Energy Particle Physics
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Kirit N. Lad, Margi K. Patel, Arun Pratap, and Jignesh N. Pandya
American Physical Society (APS)
In this reply, we respond to the comments by Lisý and Tóthová (LT) on our recent work [Phys. Rev. E 105, 064107 (2022)10.1103/PhysRevE.105.064107], where we have extended the microscopic theory of molecular motion in atomic liquids that was originally proposed by Glass and Rice [Phys. Rev. 176, 239 (1968)10.1103/PhysRev.176.239]. Contrary to our conclusion of nonavailability of a physically tractable analytical solution of the equation of motion involving dynamic friction, LT have attempted to obtain an analytical solution giving the velocity autocorrelation function in liquids. We show that the analytical solution of the equation of motion derived by LT is incomplete and not an appropriate solution for the description of atomic dynamics in liquids. It is demonstrated that the generalized statements made by LT regarding the equation of motion giving incorrect results are unjustified in the absence of substantial proofs. Also, until and unless proven otherwise, we do not find any reason for the reconsideration of the theory as suggested by LT.
N. R. Soni, A. Issadykov, A. N. Gadaria, Z. Tyulemissov, J. J. Patel, and J. N. Pandya
Springer Science and Business Media LLC
J. N. Pandya, P. Santorelli, and N. R. Soni
Springer Science and Business Media LLC
Nakul R. Soni, Rikita M. Parekh, Janaki J. Patel, Akshay N. Gadaria, and Jignesh N. Pandya
Springer Science and Business Media LLC
N. R. Soni, A. Issadykov, A. N. Gadaria, J. J. Patel, and J. N. Pandya
Springer Science and Business Media LLC
Nakul R. Soni, Aidos Issadykov, Akshay N. Gadaria, Janaki J. Patel, and Jignesh N. Pandya
AIP Publishing
N. R. Soni and J. N. Pandya
Springer Singapore
Raghav Chaturvedi, A K Rai, N R Soni, and J N Pandya
IOP Publishing
N. R. Soni, A. N. Gadaria, J. J. Patel, and J. N. Pandya
American Physical Society (APS)
Within the framework of covariant confined quark model, we compute the transition form factors of $D$ and $D_s$ mesons decaying to light scalar mesons $f_0(980)$ and $a_0(980)$. The transition form factors are then utilized to compute the semileptonic branching fractions. We study the channels namely, $D_{(s)}^+ \\to f_0(980) \\ell^+ \\nu_\\ell$ and $D \\to a_0(980) \\ell^+ \\nu_\\ell$ for $\\ell = e$ and $\\mu$. For computation of semileptonic branching fractions, we consider the $a_0(980)$ meson to be the conventional quark-antiquark structure and the $f_0(980)$ meson as the admixture of $s\\bar{s}$ and light quark-antiquark pairs. Our findings are found to support the recent BESIII data.
Raghav Chaturvedi, Vikas Patel, N. R. Soni, A. N. Gadaria, J. J. Patel, J. N. Pandya, and A. K. Rai
AIP Publishing
M. A. Ivanov, J. G. Körner, J. N. Pandya, P. Santorelli, N. R. Soni, and C. T. Tran
Springer Science and Business Media LLC
Recently, the BESIII collaboration has reported numerous measurements of various D(s) meson semileptonic decays with significantly improved precision. Together with similar studies carried out at BABAR, Belle, and CLEO, new windows to a better understanding of weak and strong interactions in the charm sector have been opened. In light of new experimental data, we review the theoretical description and predictions for the semileptonic decays of D(s) to a pseudoscalar or a vector meson. This review is essentially an extended discussion of our recently published results obtained in the framework of the covariant confining quark model.
N. R. Soni and J. N. Pandya
American Physical Society (APS)
N. R. Soni and J. N. Pandya
Springer International Publishing
Semileptonic decay widths of \\(D_s^+\\) mesons \\((D_s^+ \\rightarrow K^{(*)0} \\ell ^+\\nu _{\\ell })\\) are presented. The required transition form factors are computed in the entire physical range of momentum transfer in the framework of covariant quark model (CQM). We compute the branching fractions incorporating the form factors and obtain the ratio of the partial decay width \\(\\varGamma (D_s^+ \\rightarrow K^0\\mu ^+\\nu _\\mu )/\\varGamma (D_s^+ \\rightarrow K^0e^+\\nu _e) = 0.98\\) which is in close resemblance with isospin symmetry.
N. R. Soni, M. A. Ivanov, J. G. Körner, J. N. Pandya, P. Santorelli, and C. T. Tran
American Physical Society (APS)
Inspired by recent improved measurements of charm semileptonic decays at BESIII, we study a large set of $D(D_s)$-meson semileptonic decays where the hadron in the final state is one of $D^0$, $\\rho$, $\\omega$, $\\eta^{(\\prime)}$ in the case of $D^+$ decays, and $D^0$, $\\phi$, $K^0$, $K^\\ast(892)^0$, $\\eta^{(\\prime)}$ in the case of $D^+_s$ decays. The required hadronic form factors are computed in the full kinematical range of momentum transfer by employing the covariant confined quark model developed by us. A detailed comparison of the form factors with those from other approaches is provided. We calculate the decay branching fractions and their ratios, which show good agreement with available experimental data. We also give predictions for the forward-backward asymmetry and the longitudinal and transverse polarizations of the charged lepton in the final state.
N. R. Soni, B. R. Joshi, R. P. Shah, H. R. Chauhan, and J. N. Pandya
Springer Science and Business Media LLC
The mass spectra and decay properties of heavy quarkonia are computed in nonrelativistic quark-antiquark Cornell potential model. We have employed the numerical solution of Schrödinger equation to obtain their mass spectra using only four parameters namely quark mass ($$m_c$$mc, $$m_b$$mb) and confinement strength ($$A_{c\\bar{c}}$$Acc¯, $$A_{b\\bar{b}}$$Abb¯). The spin hyperfine, spin-orbit and tensor components of the one gluon exchange interaction are computed perturbatively to determine the mass spectra of excited S, P, D and F states. Digamma, digluon and dilepton decays of these mesons are computed using the model parameters and numerical wave functions. The predicted spectroscopy and decay properties for quarkonia are found to be consistent with available data from experiments, lattice QCD and other theoretical approaches. We also compute mass spectra and life time of the $$B_c$$Bc meson without additional parameters. The computed electromagnetic transition widths of heavy quarkonia and $$B_c$$Bc mesons are in tune with available experimental data and other theoretical approaches.
N. R. Soni, R. R. Chaturvedi, A. K. Rai, and J. N. Pandya
Springer International Publishing
We compute the mass and hadronic decay widths of exotic states of \\(Z_c^+(3900)\\) and \\(Z_b^+(10610)\\) with \\(J^P\\) = \\(1^+\\) by considering them as molecular states of \\(D^+\\bar{D}^*\\) and \\(B\\bar{B}^*\\) mesons respectively using the modified Woods Saxon plus Coulomb potential.
N. R. Soni and J. N. Pandya
American Physical Society (APS)
J. N. Pandya, N. R. Soni, N. Devlani, and A. K. Rai
IOP Publishing
The electromagnetic radiative transition widths for heavy quarkonia, as well as digamma and digluon decay widths, are computed in the framework of the extended harmonic confinement model (ERHM) and Coulomb plus power potential (CPPν) with varying potential index ν. The outcome is compared with the values obtained from other theoretical models and experimental results. While the mass spectra, digamma and digluon widths from ERHM as well as CPPν=1 are in good agreement with experimental data, the electromagnetic transition widths span over a wide range for the potential models considered here making it difficult to prefer a particular model over the others because of the lack of experimental data for most transition widths.
A. K. Rai, J. N. Pandya, and P. C. Vinodkumar
Springer Science and Business Media LLC
Decay rates of quarkonia are studied within the framework of NRQCD formalism. The basic parameters of the formalism have been obtained from different potential schemes studied for the spectra of quarkonia. We estimate the heavy-quarkonia mass spectra, radiative and leptonic widths and compare them with other contemporary theoretical approaches and experimental results.
J. N. Pandya, Ajay Kumar Rai, P. C. Vinodkumar, and Aalok Misra
AIP
The masses of charmonium s and p‐states, pseudoscalar and vector decay constants, leptonic, hadronic as well as radiative decay widths for charmonia have been computed in the framework of extended harmonic confinement model without any additional parameters. The outcome in comparison with other contemporary theoretical and experimental results is presented.
Ajay Kumar Rai, J.N. Pandya, and P.C. Vinodkummar
Elsevier BV
Multiquark systems such as tetraquarks, pentaquarks and hexaquarks states are studied as di-hadronic molecules in a nonrelativistic model. The masses of several di-hadronic states using a molecular interaction provided by asymptotic expression of the confined gluon exchange potential are computed. The exotic states such as f0 (0.982), f2 (1.565), f2 (1.950), X(3.87), DsJ (2.317, 2.460, 2.632), ψ(4.040) etc are identified as the low lying di-mesonic states, and Θ + (1.54) as a K − N molecular state.