On Decoupling of Massless Modes in NCOS Theories
  We revisit the decoupling phenomenon of massless modes in the noncommutative open string (NCOS) theories. We check the decoupling by explicit computation in (2+1) or higher dimensional NCOS theories and recapitulate the validity of the decoupling to all orders in perturbation theory. 
Seungjoon Hyun, Sangmin Lee, Hyeonjoon Shin