Direct J/psi and psi' Polarization and Cross Sections at the Tevatron

Details Direct J/psi and psi' Polarization and Cross Sections at the Tevatron Direct J/psi and psi' Polarization and Cross Sections at the Tevatron

1996-11-03

arxiv.org/abs/hep-ph/9611218v1

Phys.Rev.D55:5269-5272,1997

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, LaTeX, 3 figures included via epsf.sty

Scientific paper

10.1103/PhysRevD.55.5269

Transverse polarization of ${}^3 S_1$ charmonium states, produced directly in $p\bar{p}$ collisions at asymptotically large transverse momentum p_t, has emerged as the most prominent test of color octet contributions and spin symmetry in quarkonium production. We present predictions for the polar angle distribution at moderate values of p_t \sim 4 - 20 GeV, covered by the Tevatron Run I data. We update the fits of NRQCD matrix elements and discuss their theoretical uncertainties. With our best fit values, no transverse polarization is expected at p_t \sim 5 GeV, but the angular distribution is predicted to change dramatically as p_t increases to 20 GeV.

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