Measurement of the total cross-section difference for pp scattering in longitudinal spin states

Theoretical arguments more general than original MIT bag calculation predict exotic charmed-strange scalar mesons with striking signatures in same mass range as F and F¹, on the same basis as the prediction of the low-lying nonexotic qq$\text{qq}$ scalar nonet. Identification of δ (970) as qq$\text{qq}$ state enables rough mass prediction for charmed-strange exotics via charmed-strange analogy. Dominant signatures and decay modes of exotics are discussed.