Shashank Bhatnagar

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20242026

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hep-ph2026

Exclusive production of P-wave charmonia through two virtual photons in electron-positron annihilation

Avinash Okram, Shashank Bhatnagar

We present a relativistic study of the exclusive double-charmonium processes $e^{-} e^{+} \to γ^{*} γ^{*} \to χ_{c 1} + η_{c}$ and $e^{-} e^{+} \to γ^{*} γ^{*} \to h_{c} + h_{c}$ at $s = 10.6$ GeV in the fr…

hep-ph2025

$γ, J / ψ$ production through ISR process in electron-positron annihilation at B-factories

Shashank Bhatnagar

We study the Initial state radiation (ISR) process, $e^{-} e^{+} \to^{*} γ \to γ + J / ψ$ observed at high luminosity $e^{-} e^{+}$ colliders such as B-factories, with the ISR phot…

hep-ph2024

$(J / ψ, J / ψ)$ , and $(η_{c}, η_{c})$ production through two intermediate photons in electron-positron annihilation at B-factories

Shashank Bhatnagar, Hluf Negash

We study the processes, $e^{-} e^{+} \to γ^{*} γ^{*} \to J / ψ + J / ψ$ , and $e^{-} e^{+} \to γ^{*} γ^{*} \to η_{c} + η_{c}$ at $s = 10.6$ GeV in the framework of $4\time…

Exclusive production of P-wave charmonia through two virtual photons in electron-positron annihilation

γ,J/ψ production through ISR process in electron-positron annihilation at B-factories

(J/ψ,J/ψ), and (ηc​,ηc​) production through two intermediate photons in electron-positron annihilation at B-factories

$γ, J / ψ$ production through ISR process in electron-positron annihilation at B-factories

$(J / ψ, J / ψ)$ , and $(η_{c}, η_{c})$ production through two intermediate photons in electron-positron annihilation at B-factories