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We propose a phase factor of the worldsheet S-matrix for strings on AdS_5 xS^5 apparently solving Janik's crossing relation.Comment: 9 pages, v2: revised conclusions about agreement with perturbative  string theory; minor changes, v3: resolution to above problems indicated, to  appear in Mod. Phys. Lett.

ON THE SCATTERING PHASE FOR AdS5 × S5 STRINGS

ON THE SCATTERING PHASE FOR AdS₅ × S⁵ STRINGS