The "handbag" model was proposed as an alternative, at the present day energies, to the leading term QCD predictions for some hard exclusive processes. The recent precise data from the Belle Collaboration on the large angle cross sections gamma gamma -> pi pi, KK allow a check of these two approaches to be performed. It is shown that the handbag model fails to describe the data from Belle, while the leading term QCD predictions are in reasonable agreement with these data. (c) 2006 Elsevier B.V. All rights reserved.
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机译:在当今的能源领域,“手提包”模型被提出来替代一些硬排他性过程的领先项QCD预测。Belle Collaboration 最近对大角度截面 gamma gamma -> pi pi, KK 的精确数据允许对这两种方法进行检查。结果表明,手袋模型无法描述来自Belle的数据,而领先项QCD预测与这些数据合理一致。(c) 2006年Elsevier B.V.保留所有权利。
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