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We discover new hard string scattering amplitudes (HSSA) with polarizationsorthogonal to the scattering plane in the NS sector of 10D open superstringtheory. The corresponding HSSA in the bosonic string theory are of subleadingorder in energy. In addition, all HSSA are found to be proportional to eachother and the ratios among these HSSA are calculated to justify Grossconjecture in 1988 on high energy symmetry of string theory. Moreover, togetherwith these new HSSA, the total number of HSSA calculated in the first massivelevel of NS sector are found to agree with those of hard polarized fermionstring scattering amplitudes (PFSSA) in the R sector calculated recently.

New bosonic hard string scattering amplitudes and extended Gross conjecture in superstring theory