Quarkonium: New Developments

Details Quarkonium: New Developments Quarkonium: New Developments

2004-03-17

arxiv.org/abs/hep-ph/0403187v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 13 figures, uses boxedeps and LaThuileFPSproa.sty (included). Presented at XVIII Rencontres de la Vallee d'Aoste, La

Scientific paper

To illustrate the campaign to understand heavy quarkonium systems, I focus on a puzzling new state, $X(3872) \to \pi^+\pi^- J/\psi$. Studying the influence of open-charm channels on charmonium properties leads us to propose a new charmonium spectroscopy: additional discrete charmonium levels that can be discovered as narrow resonances of charmed and anticharmed mesons. I recall some expectations for a new spectroscopy of mesons with beauty and charm, the $B_c$ ($b\bar{c}$) system. Throughout, I call attention to open issues for theory and experiment.

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