Search for direct production of the $f_1(1285)$ resonance in $e^+e^-$ collisions

Understand

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 $2.5\sigma$.