  We have investigated the flavor changing top quark physics on the
dimension-six anomalous $tq\gamma$ ($q=u,c$) couplings through the process
$pp\to p\gamma \gamma p\to p t\bar{q}p$ at the LHC by considering different
forward detector acceptances. In this paper, we have taken into account and
examine the effects of top quark decay. The sensitivity bounds on the anomalous
couplings and, $t\to q\gamma$ branching ratio have been obtained at the $95\%$
confidence level for the effective lagrangian approach. Besides, we have
investigated the effect of the anomalous couplings on single top quark spin
asymmetry.
