摘要：To take the full advantage of the data set collected at collider at charm energy region, a tag method is developed to directly measure the meson decay branching fractions absolutely. The meson decay can be measured with the sample tagged by the two soft charged pions from the decay . This method is illustrated by comparing the input and output branching fractions of with 106 million inclusive Monte Carlo samples. The consistent result confirms the validity of the tag method.
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