학술논문
Search for direct production of the $f_1(1285)$ resonance in $e^+e^-$ collisions
Document Type
Working Paper
Author
SND Collaboration; Achasov, M. N.; Barnyakov, A. Yu.; Beloborodov, K. I.; Berdyugin, A. V.; Berkaev, D. E.; Bogdanchikov, A. G.; Botov, A. A.; Dimova, T. V.; Druzhinin, V. P.; Golubev, V. B.; Kardapoltsev, L. V.; Kasaev, A. S.; Kharlamov, A. G.; Koop, I. A.; Korol, A. A.; Kovrizhin, D. P.; Koshuba, S. V.; Kupich, A. S.; Litvinov, R. A.; Lysenko, A. P.; Martin, K. A.; Melnikova, N. A.; Muchnoi, N. Yu.; Obrazovsky, A. E.; Pakhtusova, E. V.; Perevedentsev, E. A.; Pugachev, K. V.; Serednyakov, S. I.; Silagadze, Z. K.; Shatunov, P. Yu.; Shatunov, Yu. M.; Shtol, D. A.; Shwartz, D. B.; Surin, I. K.; Usov, Yu. V.; Zemlyansky, I. M.; Zhabin, V. N.; Zhulanov, V. V.
Source
Phys. Lett. B 800, 135074 (2020)
Subject
Language
Abstract
A search for direct production of the $f_1(1285)$ resonance in $e^+e^-$ annihilation is performed with the SND detector at the VEPP-2000 $e^+e^-$ collider. The analysis is based on data with an integrated luminosity of 15.1 pb$^{-1}$ accumulated in the center-of-mass energy range 1.2--1.4 GeV. Two $e^+e^-\to f_1(1285)$ candidate events are found at the peak of the resonance and zero events beyond the resonance. The significance of the $e^+e^-\to f_1(1285)$ signal is $2.5\sigma$. The cross section at the maximum of the resonance is found to be $\sigma(e^+e^-\to f_1)=45^{+33}_{-24}$ pb. The corresponding branching fraction $B(f_1(1285)\to e^+e^-)=(5.1^{+3.7}_{-2.7})\times 10^{-9}$. We consider this result as a first indication of the process $e^+e^-\to f_1(1285)$. The measured branching fraction is consistent with the theoretical prediction.
Comment: 11 pages, 4 figures
Comment: 11 pages, 4 figures