PARTICLE SPECTRUM OF THE SUPERSYMMETRIC STANDARD MODEL FROM THE MASSLESS EXCITATIONS OF A FOUR-DIMENSIONAL SUPERSTRING
Abstract
A superstring action is quantised with Neveu–Schwarz (NS) and Ramond (R) boundary conditions. The zero mass states of the NS sector are classified as the vector gluons, W-mesons, Bμ-mesons and scalars containing Higgs. 15 zero mass fermions are obtained from the Ramond sector. A spacetime supersymmetric Hamiltonian of the Standard Model is presented without any conventional SUSY particles.