Spin-Flip Interactions and the Puzzle of psi's Polarization at Tevatron

Details Spin-Flip Interactions and the Puzzle of psi's Polarization at Tevatron Spin-Flip Interactions and the Puzzle of psi's Polarization at Tevatron

2006-01-26

arxiv.org/abs/hep-ph/0601215v3

Phys.Lett.B645:180-184,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

match the published version Phys.Lett.B645:180-184,2007

Scientific paper

10.1016/j.physletb.2006.12.023

Nonrelativistic QCD provides a systematic approach for inclusive decays and productions of a quarkonium. By taking color-octet components into account, the approach can explain the $\psi'$-anomaly at Tevatron, where the measured production rate at large transverse momentum $p_\perp$ is in order of magnitude larger than the predicted with color-singlet components only. With the approach one can predict that the produced $J/\psi$ and $\psi'$ at large $p_\perp$ will be transversely polarized. But the prediction fails in confronting with experimental measurements and this generates a puzzle. We examine the role of spin-flip interactions in the spin density matrix of the transition of a color-octet charm quark pair into $J/\psi$ and $\psi'$. These interactions will introduce new nonperturbative parameters in the spin density matrix. Our result shows that the impact of the interactions is always to dilute the polarization and can be very significant. Taking the impact into account, predictions for the polarization are more close to the measured than the previous predicted. The same can also be expected for the polarization of $J/\psi$.

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