Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-09-17
Phys.Rev.D57:4258-4274,1998
Physics
High Energy Physics
High Energy Physics - Phenomenology
35 pages, LaTeX, 8 figures included via epsf.sty
Scientific paper
10.1103/PhysRevD.57.4258
The comparison of $J/\psi$ photoproduction data in the inelastic region with theoretical predictions based on the NRQCD approach has remained somewhat ambiguous and controversial, in particular at large values of the inelasticity variable $z$. We study the polar and azimuthal decay angular distribution of $J/\psi$ mesons as functions of $z$ and transverse momentum $p_t$. Future measurements of decay angular distributions at the HERA $ep$ collider will provide a new test of theoretical approaches to factorisation between perturbation theory and quarkonium bound-state dynamics and shed light on the colour-octet production fraction in various regions of $z$ and $p_t$.
Beneke Martin
Kramer Mallie Mae
Vänttinen M.
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