Abstract
We present the study of the decay J/ψ → ρπ. The results are based on of 5.2 million J/ψ events collected by the KEDR detector at the VEPP-4M collider. The branching fractions are measured to be \( \mathcal{B} \)(J/ψ → ρπ) = (2.072 ± 0.017 ± 0.062) ∙ 10−2 and \( \mathcal{B} \)(J/ψ → π+π−π0) = (1.878 ± 0.013 ± 0.051) ∙ 10−2, where the first uncertainties are statistical and the second systematic. Our results are more precise than the previous relative measurements.
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Acknowledgments
We greatly appreciate the efforts of the staff of VEPP-4M to provide good operation of the complex during long term experiments. The authors are grateful to V.P. Druzhinin and A.I. Milstein for useful discussions. The Siberian Supercomputer Center and Novosibirsk State University Supercomputer Center are gratefully acknowledged for providing supercomputer facilities.
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The KEDR collaboration., Anashin, V.V., Anchugov, O.V. et al. Measurement of the branching fraction of J/ψ → ρπ at KEDR. J. High Energ. Phys. 2023, 196 (2023). https://doi.org/10.1007/JHEP06(2023)196
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DOI: https://doi.org/10.1007/JHEP06(2023)196