Under the χ_c1(2P) dominance hypothesis, NRQCD predicts largely longitudinal polarization for prompt X(3872) and largely transverse polarization for its decay J/ψ at LHC conditions.
The definition of θ depends on the choice of co- ordinate frame
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Deciphering the $X(3872)$ via its polarization in prompt production at the CERN LHC
Under the χ_c1(2P) dominance hypothesis, NRQCD predicts largely longitudinal polarization for prompt X(3872) and largely transverse polarization for its decay J/ψ at LHC conditions.