Note regarding the observation of quark-type fractional electric charges
Kancheli O. V., Chkareuli Dzh. L.
Expansion of the charge spectrum of quarks and leptons leads to grand unified models whose electroweak sector contains a second neutral boson with a mass S 90 GeV. This boson may already be of experimental interest. A method is suggested for measuring the masses of new, heavy quarks and leptons.