Phenomenology of spin observables in the reactions of meson production with the ¹ S ₀ Diproton pN → {pp} _s X

Abstract

Formalism for spin observables for production of pseudoscalar, scalar, and vectormesons in pN collision with formation of the ¹ S ₀ diproton {pp} _s in the final state is considered in model-independent way assuming parity and angular momentum conservation. Production of the pseudoscalar mesons (J ^π = 0⁻) is described by two spin amplitudes and both of them can be completely determined by measurement of unpolarized cross section dσ ₀, vector analyzing power A _y , and spin-correlation coefficients C _x,x = −C _z,z > and C _x,z . Similar result is obtained for production of scalar mesons (J ^π = 0⁺). It is shown that measurement of the tensor polarization t ₂₀ of the vector meson V (J ^π = 1⁻) in the reaction pN → {pp} _s V in collinear kinematics gives the same information as measurement of the spin-correlation coefficients C _z,z or C _y,y .