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Solution of $a_2/a_1$ sign problem in heavy meson decays: nonfactorizable soft gluons in nonleptonic heavy meson decays

B. Tseng·Hsiang-nan Li
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Abstract

For the first time, a solution to the $a_2/a_1$ sign problem in heavy meson decay based on PQCD factorization theorems. The point is to include QCD evolution effort characteristic scales involved in decay processes.

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B. Tseng, Hsiang-nan Li. 1997-12-26. Solution of $a_2/a_1$ sign problem in heavy meson decays: nonfactorizable soft gluons in nonleptonic heavy meson decays. https://arxiv.org/abs/hep-ph/9712527

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