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Paper IPM / P / 8746  


Abstract:  
We calculate the disk level Smatrix element of one closed string RR field, two open string tachyons
and one gauge field in type II superstring theory. An expansion for the Smatrix element has been
found that its four leading order terms are reproduced exactly by the symmetric trace tachyon DBI
and the WessZumino actions of DbraneantiDbrane systems. Using this consistency, we have also
found the first higher derivative correction to the some of the WZ terms.
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