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Search for direct production of the f 1 (1285) resonance in e + e − collisions

Physics Letters B, ISSN: 0370-2693, Vol: 800, Page: 135074
2020
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Article Description

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 2.5 σ. 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.

Bibliographic Details

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

Elsevier BV

Physics and Astronomy

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