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Paper IPM / Physic / 11302  


Abstract:  
We calculate in details ,the disk level Smatrix element of one RamondRamond and three gauge field vertex operators in the world volume of BPS branes ,to find four gauge field couplings to all order of α′ up to onshell ambiguity .Then using these infinite couplings we find that the massless pole of the field theory amplitude is exactly equal to the massless pole Smatrix element of this amplitude for p=n case to all order of α′.Finally we show that the infinite massless poles and the contact terms of this amplitude for p=n+2 case can be reproduced by symmetric action DBI and the WZ actions, and by their higher derivative corrections.
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