On Decoupling of Massless Modes in NCOS Theories

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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.
12 pages, latex2e, 2 figures; reference added, some modification without changing result

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