  The COMPASS collaboration, as a part of their hadron spectroscopy program, is
going to measure the radiative decay widths of light-quark mesons via the
Primakoff reactions. In this letter we study the photon couplings of
light-quark q qbar states in the covariant oscillator quark model and evaluate
the transition rates for {rho(770), b_1(1235), a_1(1260), a_2(1320),
pi_2(1670), rho_3(1690), rho(1700)}^pm to pi^pm gamma, which are expected to be
measured by the COMPASS. Such photon couplings could be useful not only for
understanding the internal structures of observed light-quark mesons and their
quark-model classification but also for the ongoing experimental studies by
COMPASS.
