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Polarized Heavy Quarkonium Production in the Color Evaporation Model

Research paper by Vincent Cheung, Ramona Vogt

Indexed on: 24 Feb '17Published on: 24 Feb '17Published in: arXiv - High Energy Physics - Phenomenology



Abstract

We explore polarized heavy quarkonium production using the color evaporation model at leading order. We present the polarized to total yield ratio as a function of center of mass energy and rapidity in $p+p$ collisions. At energies far above the $Q \overline Q$ production threshold, we find charmonium and bottomonium production to be longitudinally polarized ($J_z=0$). The quarkonium states are also longitudinally polarized at central rapidity, becoming transversely polarized ($J_z=\pm1$) at the most forward rapidities.