Journal
PHYSICAL REVIEW D
Volume 104, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.104.094026
Keywords
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Funding
- U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics (Nuclear Theory) [DE-SC-0004014]
- LLNL-LDRD Program [21-LW-034]
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In the improved color evaporation model, we calculated the production and polarization of direct J/psi at O(alpha(3)(s)) in the collinear factorization approach. Our findings show agreement between J/psi cross sections and invariant polarization parameters at small and moderate transverse momentum.
We calculate the production and polarization of direct J/psi in the improved color evaporation model at O(alpha(3)(s)) in the collinear factorization approach. We present the first calculation of polarization parameters lambda(theta), lambda(phi), and lambda(theta phi) in the helicity and the Collins-Soper frames as well as the frame-invariant polarization parameter (lambda) over tilde as a function of transverse momentum. We find agreement with both J/psi cross sections and the invariant polarization parameters at small and moderate p(T).
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