Search for direct production of the f1(1285) resonance in e+e collisions

M. N. Achasov, A. Yu Barnyakov, K. I. Beloborodov, A. V. Berdyugin, D. E. Berkaev, A. G. Bogdanchikov, A. A. Botov, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, L. V. Kardapoltsev, A. S. Kasaev, A. G. Kharlamov, I. A. Koop, A. A. Korol, D. P. Kovrizhin, S. V. Koshuba, A. S. Kupich, R. A. Litvinov, A. P. LysenkoK. A. Martin, N. A. Melnikova, N. Yu Muchnoi, A. E. Obrazovsky, E. V. Pakhtusova, E. A. Perevedentsev, K. V. Pugachev, S. I. Serednyakov, Z. K. Silagadze, P. Yu Shatunov, Yu M. Shatunov, D. A. Shtol, D. B. Shwartz, I. K. Surin, Yu V. Usov, I. M. Zemlyansky, V. N. Zhabin, V. V. Zhulanov

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3 Citations (Scopus)


A search for direct production of the f1(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→f1(1285) candidate events are found at the peak of the resonance and zero events beyond the resonance. The significance of the e+e→f1(1285) signal is 2.5σ. The cross section at the maximum of the resonance is found to be σ(e+e→f1)=45−24 +33 pb. The corresponding branching fraction B(f1(1285)→e+e)=(5.1−2.7 +3.7)×10−9. We consider this result as a first indication of the process e+e→f1(1285). The measured branching fraction is consistent with the theoretical prediction.

Original languageEnglish
Article number135074
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publication statusPublished - 10 Jan 2020


  • SND

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