期刊
PHYSICAL REVIEW D
卷 105, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.105.034005
关键词
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资金
- Croatian Science Foundation [IP-2019-04-9709]
- EU [824093]
We investigate the wide-angle photoproduction of the eta'-meson using the handbag approach and find that, unlike pion and eta photoproduction, this process is dominated by twist 2 due to the gluon content of the eta'. By utilizing the available information on twist-2 and twist-3 distribution amplitudes and eta-eta' mixing, we are able to predict the cross section and helicity correlations for eta' photoproduction. We argue that studying eta' photoproduction is valuable in improving our understanding of the two-gluon distribution amplitude.
We investigate wide-angle photoproduction of the eta'-meson within the handbag approach to twist-3 accuracy. It turns out that, due to the gluon content of the eta', this process is dominated by twist 2 in contrast with pion and eta photoproduction. Using the presently available information on the twist-2 and twist-3 distribution amplitudes and on the eta - eta' mixing, we provide prediction for the eta' cross section and helicity correlations. It is argued that eta' photoproduction is well suited to improve our knowledge of the two-gluon distribution amplitude.
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