J. N. Pandya

Decay rates of quarkonia and potential models

The decay rates of and mesons have been studied with contributions from different correction terms. The corrections based on hard processes involved in the decays are quantitatively studied in the framework of different phenomenological potential models.

Multiquark states as di-hadronic molecules

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.

Decay rates of quarkonia with NRQCD formalism using spectroscopic parameters of potential models

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.

Decay rates and electromagnetic transitions of heavy quarkonia

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 (CPP

Mass and Hadronic Decay Widths of Z States as Di-meson Molecule

_\nu

Open flavour Charmed Mesons

) with varying potential index

Low-lying di-hadronic states in relativistic harmonic model

\nu

Semileptonic

. 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 CPP

D(D_s)

_{\nu=1}

-meson decays in the light of recent data.

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.