A new method for the direct measurement of the quark charge is proposed. Instead of a neutrino beam, an electron, photon, or hadron beam can be used so the statistics is much larger in our method. Examples of $\gamma -N$ and $e-N$ collisions are presented for measuring the $u$- and $d$-quark charge.

• Received 18 April 1988

DOI:https://doi.org/10.1103/PhysRevD.40.248