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To take the full advantage of the ψ(3686) data set collected at ee collider at τ−charm energy region, a tag method is developed to directly measure the J/ψmeson decay branching fractions absolutely. The J/ψmeson decay can be measured with the J/ψ sample tagged by the two soft charged pions from the decay ψ(3686) → J/ψππ. This method is illustrated by comparing the input and output branching fractions of J/ψ → γη with 106 million inclusive ψ(3686)Monte Carlo samples. The consistent result confirms the validity of the tag method.

advances in high energy physics

A Method for the Direct Absolute Measurement of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math> Decay with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M2"><mml:mrow><mml:mi>ψ</mml:mi></mml:mrow></mml:math>(3686) Data Set

A Method for the Direct Absolute Measurement of J/ψ Decay with ψ(3686) Data Set