Polarizations of J/ψand ψ' in hadroproduction at Tevatron in the k_t factorization approach

Details Polarizations of J/ψand ψ' in hadroproduction at Tevatron in the k_t factorization approach Polarizations of J/ψand ψ' in hadroproduction at Tevatron in the k_t factorization approach

2000-09-19

arxiv.org/abs/hep-ph/0009224v2

Phys.Rev.Lett.87:022002,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 4 PS files, final version for publication

Scientific paper

10.1103/PhysRevLett.87.022002

We present a calculation for the polarizations of $J/\psi$ and $\psi'$ produced in the hadron collisions at the Fermilab Tevatron. Various color octet channels including ${}^1S_0^{(8)}$, ${}^3P_J^{(8)}$, and ${}^3S_1^{(8)}$ as well as contributions from $\chi_{cJ}$ decays are considered in the $k_t$ factorization approach. We find that in a rather wide range of the transverse momenta of $J/\psi$ and $\psi'$, the production rates could be dominated by the ${}^1S_0^{(8)}$ channel, and the predicted polarizations from the ${}^1S_0^{(8)}$ channel and $\chi_{cJ}$ feeddown contributions are roughly compatible with the preliminary CDF data. This might provide a possible release from the conflict between the NRQCD collinear parton model calculations and the CDF data.

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