English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In this work we calculate the mass spectrum of charmonium for $1P,...,3P$states of $0^{++}$ , $1^{++}$, as well as for $1S,...,4S$ states of $0^{-+}$,and $1S, ...,5D$ states of $1^{--}$ along with the two-photon decay widths ofground and first excited state of $0^{++}$ quarkonia for the process,$O^{++}\rightarrow \gamma\gamma$ in the framework of a QCD motivatedBethe-Salpeter Equation. In this $4\times 4$ BSE framework, the coupledSalpeter equations are first shown to decouple for the confining part ofinteraction, under heavy-quark approximation, and analyically solved, and laterthe one-gluon-exchange interaction is perturbatively incorporated leading tomass spectral equations for various quarkonia. The analytic forms of wavefunctions obtained are used for calculation of two-photon decay widths of$\chi_{c0}$. Our results are in reasonable agreement with data (where everavailable) and other models.

An approach to calculation of mass spectra and two-photon decays of $c\overline{c}$ mesons in the framework of Bethe-Salpeter Equation