학술논문
Measurement of the branching fraction of $J/\psi\rightarrow\rho\pi$ at KEDR
Document Type
Working Paper
Author
Anashin, V. V.; Anchugov, O. V.; Andrianov, A. V.; Astrelina, K. V.; Aulchenko, V. M.; Baldin, E. M.; Baranov, G. N.; Barladyan, A. K.; Barnyakov, A. Yu.; Barnyakov, M. Yu.; Basok, I. Yu.; Batrakov, A. M.; Bekhtenev, E. A.; Belikov, O. V.; Berkaev, D. E.; Blinov, A. E.; Blinov, V. E.; Blinov, M. F.; Bobrov, A. V.; Bobrovnikov, V. S.; Bogomyagkov, A. V.; Bolkhovityanov, D. Yu.; Bondar, A. E.; Buzykaev, A. R.; Cheblakov, P. B.; Dorohov, V. L.; Emanov, F. A.; Gambaryan, V. V.; Grigoriev, D. N.; Kaminskiy, V. V.; Karnaev, S. E.; Karpov, G. V.; Karpov, S. V.; Karukina, K. Yu.; Kashtankin, D. P.; Kasyanenko, P. V.; Katcin, A. A.; Kharlamova, T. A.; Kiselev, V. A.; Kononov, S. A.; Krasnov, A. A.; Kravchenko, E. A.; Kudryavtsev, V. N.; Kulikov, V. F.; Kuyanov, I. A.; Levichev, E. B.; Logachev, P. V.; Maksimov, D. A.; Maltseva, Yu. I.; Malyshev, V. M.; Maslennikov, A. L.; Meshkov, O. I.; Mishnev, S. I.; Morozov, I. A.; Morozov, I. I.; Nikiforov, D. A.; Nikitin, S. A.; Nikolaev, I. B.; Okunev, I. N.; Oreshkin, S. B.; Osipov, A. A.; Ovtin, I. V.; Pavlenko, A. V.; Peleganchuk, S. V.; Piminov, P. A.; Podgornov, N. A.; Prisekin, V. G.; Rezanova, O. L.; Ruban, A. A.; Savinov, G. A.; Shamov, A. G.; Shekhtman, L. I.; Shvedov, D. A.; Shwartz, B. A.; Simonov, E. A.; Sinyatkin, S. V.; Skrinsky, A. N.; Sokolov, A. V.; Starostina, E. V.; Sukhanov, D. P.; Sukharev, A. M.; Talyshev, A. A.; Tayursky, V. A.; Telnov, V. I.; Tikhonov, Yu. A.; Todyshev, K. Yu.; Tribendis, A. G.; Tumaikin, G. M.; Usov, Yu. V.; Vorobiov, A. I.; Zhilich, V. N.; Zhukov, A. A.; Zhulanov, V. V.; Zhuravlev, A. N.
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Abstract
We present the study of the decay $J/\psi \rightarrow \rho\pi$. The results are based on of 5.2~million $J/\psi$ events collected by the KEDR detector at the VEPP-4M collider. The branching fractions are measured to be $\B(J/\psi \rightarrow \rho\pi) = \big(2.072\pm 0.017 \pm 0.062 \big)\cdot 10^{-2}$ and $\B(J/\psi \rightarrow \pi^+\pi^-\pi^0) = \big(1.878 \pm 0.013 \pm 0.051 \big)\cdot 10^{-2}$, where the first uncertainties are statistical and the second systematic. Our results are more precise than the previous relative measurements.