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Next-to-leading-order relativistic and QCD corrections to prompt $\boldsymbol{J/ψ}$ pair photoproduction at future $\boldsymbol{e^+e^-}$ colliders

Published 13 Apr 2024 in hep-ph | (2404.08945v1)

Abstract: Within the framework of nonrelativistic-QCD factorization, we calculate both the next-to-leading-order relativistic and QCD corrections to prompt $J/\psi$ pair production, with feeddown from $\psi(2S)$ mesons, via photon-photon collisions at future $e+e-$ colliders including the Future Circular Lepton Collider (FCC-ee), the Circular Electron Positron Collider (CEPC), and the Compact Linear Collider (CLIC). We present total cross sections and distributions in single $J/\psi$ transverse momentum and rapidity, and in $J/\psi$ pair invariant mass. The relativistic and QCD corrections both turn out to be large and negative. Yet, the production rates are large enough for useful experimental studies.

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