Speaker
Sergey Serednyakov
(BINP Novosibirsk)
Description
The e$^+$e$^-$$\rightarrow$ $\text{n} \bar{\text{n}}$ cross section has been measured in the experiment at the VEPP-2000 e$^+$e$^-$ collider with the SND detector. The technique of the time measurements in the multichannel NaI(Tl) electromagnetic calorimeter is used to select n anti-n events. The value of the measured cross section from the threshold up to 2 GeV varies from 0.6 to 0.4 nanobarn. The effective neutron timelike form factor is derived from the measured cross section and compared with the proton form factor. The ratio |GE|/|GM| of the neutron electric and magnetic form factor is obtained from the measured angular distribution and found to be close to 1.
Primary author
Sergey Serednyakov
(BINP Novosibirsk)