Search for direct production of the f1(1285) resonance in e+e− collisions
oleh: 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. Lysenko, K.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
| Format: | Article |
|---|---|
| Diterbitkan: | Elsevier 2020-01-01 |
Deskripsi
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.