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- W26699056 abstract "Next-to-leading-order perturbative QCD predictions are obtained for the two-photon exclusive channels ensuremath{gamma}ensuremath{gamma}ensuremath{rightarrow}${M}^{+}$${M}^{mathrm{ensuremath{-}}}$ (M=ensuremath{pi},K) at large momentum transfer. The calculation is carried out in the Feynman gauge. The dimensional-regularization method is used to control both ultraviolet and infrared divergences. The model meson distribution amplitude ${ensuremath{Phi}}_{M}$ensuremath{propto}ensuremath{delta}(x-(1/2)) is utilized as a candidate form for the nonperturbative dynamical input. In order to reduce the effect of the particular choice of ${ensuremath{Phi}}_{M}$, similarity between ensuremath{gamma}ensuremath{gamma}ensuremath{rightarrow}${M}^{+}$${M}^{mathrm{ensuremath{-}}}$ and ${ensuremath{gamma}}^{mathrm{*}}$ensuremath{rightarrow}${M}^{+}$${M}^{mathrm{ensuremath{-}}}$ (timelike meson electromagnetic form factor) is employed. In the modified minimal-subtraction (MSifmmodebarelsetextasciimacronfi{}) scheme definition of ${ensuremath{alpha}}_{s}$, renormalized at ${W}_{ensuremath{gamma}ensuremath{gamma}}$ (total center-of-mass energy of the ensuremath{gamma}ensuremath{gamma} system), and with the present estimates of ${ensuremath{Lambda}}_{mathrm{MS}mathrm{ifmmodebarelsetextasciimacronfi{}}}$ (ensuremath{sim}150 MeV), it is found that next-to-leading-order corrections become sufficiently small (l25%) only for ${W}_{ensuremath{gamma}ensuremath{gamma}}$g10 GeV, which is much larger than the highest ${W}_{ensuremath{gamma}ensuremath{gamma}}$ for which experimental data exist." @default.
- W26699056 created "2016-06-24" @default.
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- W26699056 date "1987-01-01" @default.
- W26699056 modified "2023-09-27" @default.
- W26699056 title "Beyond leading-order perturbative QCD corrections to γγ→M+M−(M=π,K)" @default.
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- W26699056 doi "https://doi.org/10.1103/physrevd.35.80" @default.
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