Authors: Roji Pius Arnab Rudra Ashoke Sen
Publish Date: 2014/07/14
Volume: 2014, Issue: 7, Pages: 58-
Abstract
String theory gives a well defined procedure for computing the Smatrix of BPS or a class of massless states but similar calculation for general massive states is plagued with difficulties due to mass renormalization effect In this paper we describe a procedure for computing the renormalized masses and Smatrix elements in bosonic string theory for a special class of massive states which do not mix with unphysical states under renormalization Even though this requires working with offshell amplitudes which are ambiguous we show that the renormalized masses and Smatrix elements are free from these ambiguities We also argue that the masses and Smatrix elements for general external states can be found by examining the locations of the poles and the residues of the Smatrix of special states Finally we discuss generalizations to heterotic and superstring theoriesThis article is published under an open access license Please check the Copyright Information section for details of this license and what reuse is permitted If your intended use exceeds what is permitted by the license or if you are unable to locate the licence and reuse information please contact the Rights and Permissions team
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