On recent puzzles in the production of heavy quarkonia

Abstract

Recently, several surprising experimental observations in the production of heavy quarkonium have been reported. In $e^{+}{e}^{-}$ annihilation at $\sqrt{s}=10.6$ GeV, Belle Collaboration finds that $J/\psi$ mesons are predominantly produced in association with an extra $\bar{c}c$ pair, with $\sigma (e^{+}{e}^{-}\to J/\psi \bar{c}c)/\sigma (e^{+}{e}^{-}\to J/\psi X)=0.59_{-0.13}^{+0.15}\pm 0.12$, and the BaBar collaboration reports that the produced $J/\psi$'s have mostly longitudinal polarization. In $\bar{p}p$ collisions at the Tevatron, the CDF Collaboration reported an excess of $J/\psi$ and ${\psi }^{\prime }$ mesons at high $p_{\perp }$ over the perturbative QCD predictions; non--perturbative approach of NRQCD can accomodate the magnitude of the production cross section but not the observed experimentally polarization of quarkonia. In this note we propose possible solutions to these puzzles, and devise further experimental tests.

3 pages, 2 figures

References in corpus (7)

• Problems of Double Charm Production in $e^{+}{e}^{-}$ Annihilation at $\sqrt{s}=10.6$ GeV
• Exclusive J/ψProductions at e^+ e^- Colliders
• e^+ e^- Annihilation into J/psi + J/psi
• Exclusive Double-Charmonium Production from e^+ e^- Annihilation into Two Virtual Photons
• Hunting for glueballs in electron-positron annihilation
• Production of $J/\psi +c\bar{c}$ through two photons in $e^{+}{e}^{-}$ annihilation
• J/psi c\bar{c} production in e+e- and hadronic interactions

Cited by in corpus (7)

• Relativistic corrections to $J/\psi$ exclusive and inclusive double charm production at B factories
• All-charm tetraquarks
• Search for excited charmonium states in $e^{+}{e}^{-}$ Annihilation at $\sqrt{s}=10.6$ GeV
• Inclusive Charmonium Production via Double $c\bar{c}$ in $e^{+}{e}^{-}$ Annihilation
• Production and detection of doubly charmed tetraquarks
• Inclusive $J/\psi$ Productions at $e^{+}{e}^{-}$ Colliders
• The color-singlet contribution to e^+ e^- ->J/psi + X at the endpoint