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Twist-3 contributions to $γγ\toπ^0π^0,\,K_S^0K_S^0$ in $k_T$ factorization
One-line summary
A solar energy research paper on Twist-3 contributions to $γγ\toπ^0π^0,\,K_S^0K_S^0$ in $k_T$ factorization.
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Chinese explanation / 中文解读
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Original abstract
We compute the cross sections for the two-photon processes $γγ\toπ^0π^0$ and $γγ\to K_S^0K_S^0$ in $k_T$ factorization, including the chirally enhanced two-parton twist-3 light-cone distribution amplitudes. For these charge-suppressed neutral channels the twist-3 cross sections exceed the twist-2 ones by close to an order of magnitude in the intermediate-energy region, bringing the predictions much closer to the Belle data, the residual underestimate being plausibly attributable to higher-order QCD corrections. The calculation reproduces the measured angular distributions and the energy dependence of the charged channels and the neutral pion, though not the steeper fall of the neutral kaon. The neutral-to-charged ratios are the most discriminating observables. They depend strongly on energy in the data, whereas our calculation, like other approaches in the literature, yields a nearly flat ratio. Finally, in a phenomenological discussion, we combine our contribution with the soft handbag contribution and largely reproduce the observed energy dependence, suggesting that the hard and soft contributions are comparably important in the few-GeV region.
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