Topics in Hadron Spectroscopy in 2009

Abstract

There have been numerous developments in hadron spectroscopy over the past year. In this brief review I focus on two general areas. In the first I give an update on hadrons with b-quarks. Their properties are in textbook agreement with QCD motivated constituent quark models. The second topic is the Charmonium-like $XYZ$ states above open charm threshold that continue to be discovered. Many of these do not seem to be described as conventional c\bar{c} states and may be hadronic molecules, Tetraquarks, or Charmonium Hybrids. The first topic is an example of how well we seem to understand hadrons while the second case reminds us of how much we still have to learn.

10 pages, 11 figures, To be published in the proceedings of DPF-2009, Detroit, MI, July 2009, eConf C090726

References in corpus (19)

• The Production and Decay of Hybrid Mesons by Flux-Tube Breaking
• Precision Measurement of the X(3872) Mass in J/psi pi+ pi- Decays
• Can Y(4140) be a $c\bar{c}s\bar{s}$ tetraquark ?
• Evidence for the eta_b(1S) Meson in Radiative Upsilon(2S) Decay
• Nature of X(3872) from data
• Measurement of the e+e- --> D0D*-pi+ cross section using initial-state radiation
• Y(4140): Possible options
• Observation of the Omega_b^- and Measurement of the Properties of the Xi_b^- and Omega_b^-
• Measurement of the eta_b(1S) mass and the branching fraction for Upsilon(3S) --> gamma eta_b(1S)
• $\{Q\bar{q}\}\{{\bar{Q}}^{{(}^{\prime })}q\}$ molecular states
• Channel coupling in heavy quarkonia: energy levels, mixing, widths and new states
• Experimental constraints on the possible J^PC quantum numbers of the X(3872)
• The line shape of the radiative open-charm decay of Y(4140) and Y(3930)
• The Charged Z(4433): Towards a New Spectroscopy
• The X(4260) and possible confirmation of psi(3D), psi(5S), psi(4D), psi(6S) and psi(5D) in J/psi pi+ pi-
• $Z^{+}(4430)$ as a resonance in the $D_1(D_1^{\prime })D^{\ast }$ channel
• The Y(4140), X(4260), psi(2D), psi(4S) and tentative psi(3D)
• Exotic ccbar spectroscopy
• Channel coupling in e+ e- annihilation into heavy meson pairs at the D* {\bar D}* threshold

Cited by in corpus (10)

• New Charmonium States in QCD Sum Rules: a Concise Review
• Properties of Excited Charm and Charm-Strange Mesons
• Bottomonium Mesons and Strategies for Their Observation
• $B$ and $B_s$ Meson Spectroscopy
• Novel Charmonium and Bottomonium Spectroscopies due to Deeply Bound Hadronic Molecules from Single Pion Exchange
• Reconciling the X(4630) with the Y(4660)
• Higher Hybrid Charmonia in an Extended Potential Model
• Central exclusive quarkonium production with tagged forward protons at RHIC
• QCD Sum Rule Studies of Heavy Quarkonium-like States
• Isospin Violation in X(3872): Explanation From a New Tetraquark Model