Measurement of the branching fraction of J/ψ → ρπ at KEDR

V. V. Anashin, O. V. Anchugov,A. V. Andrianov, K. V. Astrelina,V. M. Aulchenko, E. M. Baldin,G. N. Baranov, A. K. Barladyan,A. Yu. Barnyakov,M. Yu. Barnyakov,I. Yu. Basok, A. M. Batrakov, E. A. Bekhtenev, O. V. Belikov, D. E. Berkaev,A. E. Blinov,V. E. Blinov, M. F. Blinov,A. V. Bobrov,V. S. Bobrovnikov, A. V. Bogomyagkov, D. Yu. Bolkhovityanov,A. E. Bondar,A. R. Buzykaev, P. B. Cheblakov, V. L. Dorohov, F. A. Emanov, V. V. Gambaryan,D. N. Grigoriev, V. V. Kaminskiy, S. E. Karnaev, G. V. Karpov, S. V. Karpov, K. Yu. Karukina, D. P. Kashtankin, P. V. Kasyanenko, A. A. Katcin, T. A. Kharlamova, V. A. Kiselev, S. A. Kononov, A. A. Krasnov,E. A. Kravchenko,V. N. Kudryavtsev,V. F. Kulikov, I. A. Kuyanov, E. B. Levichev, P. V. Logachev, D. A. Maksimov,Yu. I. Maltseva, V. M. Malyshev,A. L. Maslennikov, O. I. Meshkov, S. I. Mishnev, I. A. Morozov, I. I. Morozov, D. A. Nikiforov, S. A. Nikitin, I. B. Nikolaev, I. N. Okunev, S. B. Oreshkin, A. A. Osipov,I. V. Ovtin, A. V. Pavlenko, S. V. Peleganchuk, P. A. Piminov, N. A. Podgornov, V. G. Prisekin, O. L. Rezanova,A. A. Ruban, G. A. Savinov,A. G. Shamov, L. I. Shekhtman, D. A. Shvedov,B. A. Shwartz, E. A. Simonov, S. V. Sinyatkin, A. N. Skrinsky, A. V. Sokolov, E. V. Starostina, D. P. Sukhanov, A. M. Sukharev,A. A. Talyshev,V. A. Tayursky,V. I. Telnov,Yu. A. Tikhonov,K. Yu. Todyshev, A. G. Tribendis, G. M. Tumaikin,Yu. V. Usov, A. I. Vorobiov,V. N. Zhilich, A. A. Zhukov, V. V. Zhulanov,A. N. Zhuravlev

Journal of High Energy Physics（2023）

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摘要

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 ℬ ( J/ψ → ρπ ) = (2 . 072 ± 0 . 017 ± 0 . 062) ∙ 10 − 2 and ℬ ( J/ψ → π + π − π 0 ) = (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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e+-e− Experiments,Particle and Resonance Production,Quarkonium

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