1.

Double Charmonium Productions in ElectronPositron Annihilation Using BetheSalpeter Approach
/ Negash, Hluf ; Bhatnagar, Shashank ; Bhatnagar, Shashank
We calculate the double charmonium production crosssection within the framework of $\mathrm{4}\times \mathrm{4}$ BetheSalpeter Equation in the electronpositron annihilation, at center of mass energy $\sqrt{s}=\mathrm{10.6}$ GeV, that proceeds through the exchange of a single virtual photon. [...]
Published in Advances in High Energy Physics 2019 (2019) 4029356
10.1155/2019/4029356
arXiv:1808.00805v2
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2.

Approach to calculation of mass spectra and twophoton decays of $c\overline{c}$ mesons in the framework of BetheSalpeter equation
/ Bhatnagar, Shashank ; Alemu, Lmenew
In this work we calculate the mass spectra of charmonium for $1P,\dots ,4P$ states of ${0}^{++}$ and ${1}^{++}$, for $1S,\dots ,5S$ states of ${0}^{+}$, and for $1S,\dots ,4D$ states of ${1}^{}$ along with the twophoton decay widths of the ground and first excited states of ${0}^{++}$ quarkonia for the process ${O}^{++}\to \gamma \gamma $ in the framework of a QCDmotivated BetheSalpeter equation (BSE). [...]
Published in Phys. Rev. D 97 (2018)
10.1103/PhysRevD.97.034021
arXiv:1610.03234
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3.

Radiative Decay Widths of Ground and Excited States of Vector Charmonium and Bottomonium
/ Negash, Hluf ; Bhatnagar, Shashank
We study the radiative decay widths of vector quarkonia for the process of $J/\psi (nS)\to {\eta}_{c}(nS)\gamma $ and $\mathrm{{\rm Y}}(nS)\to {\eta}_{b}(nS)\gamma $ (for principal quantum numbers $n=\mathrm{1,2},\mathrm{3}$ ) in the framework of BetheSalpeter equation under the covariant instantaneous ansatz using a $\mathrm{4}\times \mathrm{4}$ form of BSE. [...]
Published in Advances in High Energy Physics 2017 (2017) 7306825
10.1155/2017/7306825
arXiv:1703.06082v1
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4.

Decay rates of charmonia within a quarkantiquark confining potentialSupported by Major Research Project NO. F. 40457/2011(SR), UGC, India
/ Patel, Smruti ; Vinodkumar, P. C. ; Bhatnagar, Shashank
In this work, we investigate the spectroscopy and decay rates of charmonia within the framework of the nonrelativistic Schrödinger equation by employing an approximate inter quarkantiquark potential. [...]
Published in Chinese Phys. C 40 (2016) 053102
10.1088/16741137/40/5/053102
arXiv:1504.01103
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