arXiv subjects

Zaki Ahmad

Publications and source records attributed to Zaki Ahmad.

4 recordsLinked to original sources

arXiv2025

Mass Spectrum, Radii, and Radiative Decay Widths of Toponium

In this work, radial Schrodinger equation with a non-relativistic quark potential model (NRQPM) is solved numerically by employing the shooting method. Calculated numerical wave functions (or solutions) are used to compute the masses, root mean square (RMS) radii, $E1$ and $M1$ radiative transitions, and branching ratios of $S, P, D$ and $F$ states of toponium mesons ($t\overline{t}$). Calculated results are compared with recently available theoretical data. This work will be helpful for experimentalists in gaining a deeper understanding of toponium states.

hep-ph↗

arXiv2025

Charmonium spectrum and its decay properties

In this work, we have calculated the mass spectrum, radiative decays, and strong decays of charmonium (cc) by using the non-relativistic quark potential(NRQP) model. The wave functions are calculated by solving the radial Schrodinger equation numerically, which are further used to compute the radiative decay widths of (cc) states. The 3P0 model is used to calculate the strong decay widths by using the simple harmonic (SHO) wave functions. The SHO parameter \b{eta} values for different cc states are calculated by fitting it to the numerical wave functions. We also compare our results with experimental data and other theoretically predicted results. We assign to the charmonium states X(3940), X(3872), X(3862), X(4350) likely quantum numbers of ηc(3S), \c{hi}1(2P), \c{hi}0(2P) and \c{hi}2(3P) states.

hep-ph↗

arXiv2025

Energy eigenvalues of quadratic, pure quartic and quartic anharmonic oscillators with variational method

In this work, the energy eigenvalues are calculated for the quadratic ($\frac{g^2 x^2}{2}$), pure quartic ($λx^4 $), and quartic anharmonic oscillators ($\frac{g^2 x^2}{2} + λx^4 $) by applying variational method. For this, simple harmonic oscillator wave functions are considered as trial wave functions to calculate the energies for the ground state and first ten excited states with $g = 1$ and $λ=1/4$. For quartic anharmonic oscillators, energy values are calculated at different values of $λ$ with $g=1$. These energies for the ground state are compared with available numerically calculated data. Maximum value of $\%$error is found to be 1.9977. To get more accurate results, a new set of trial wave functions is suggested. With the newly proposed wave functions, maximum value of $\%$ error for the energy values reduces to 0.561. In this work, energies for the ground and first five excited states of quartic anharmonic oscillators are reported at different values of $λ$. Dependence of $λ$ on the wave functions is observed and concluded that wave functions are converging (shrinking) by increasing the $λ$.

quant-ph↗

arXiv2025

Strong Decays of Charmonia

In this work, we calculate the charmonium spectrum and strong decay widths of cc states. The calculations are performed using the quark potential model with which incorporates the relativistic effects. The resulting cc spectrum exhibits a good agreement with experimental data. The open flavor strong decay widths are calculated employing the 3P0 model. We adopt two choices of wave functions to determine the observables: the first involves the utilization of realistic wave functions obtained by solving relativistic Schrodinger equation, while the second employs Simple harmonic oscillator (SHO) wave functions whose parameters are fitted to the realistic wave functions. We find that the decay widths of higher charmonia states above the threshold value of open charm mesons are well described with these wave functions. We provide a comprehensive analysis of the strong decay widths and assigned specific charmonium states: X(3940) is assigned to the ηc(3S) state, Y (4660) to the ψ(5S) state, X(3915) to the \c{hi}0(2P) state, Zc(3900) to the hc(2P) state, X(4350) to the \c{hi}2(3P) state, and X(3842) to the ψ3(1D) state. We also compare our results with available experimental data and theoretical predictions of other models.

hep-ph↗