  Initial states of glasma in high energy heavy ion collisions are longitudinal
classical color electric and magnetic fields. Assuming finite color electric
conductivity, we show that the color electric field decays by quark pair
production with the life time of the order of $Q_s^{-1}$, i.e. the inverse of
the saturation momentum. Quarks and anti-quarks created in the pair production
are immediately thermalized as far as their temperature $\beta^{-1}$ is lower
than $Q_s$. Namely, a relaxation time of the quarks to be thermalized is much
shorter than $Q_s^{-1}$ when $\beta^{-1} \ll Q_s$. We also show that the quarks
acquire longitudinal momentum of the order of $Q_s$ by the acceleration of the
electric field. To discuss the quark pair production, we use chiral anomaly
which has been shown to be very powerful tool in the presence of strong
magnetic field.
