Searches for, and Properties of, New Charmonium-like States

Abstract

I review the recent $B$-factory measurements of new states which, in some cases, exhibit Charmonium-like properties, and in other cases suggest the existence of a new spectroscopy. Several theoretical interpretations of the new states have come to the fore although, at time of writing, we are no closer to untangling the nature of most of the particles making up the observed new zoo of states.

arXiv comment6 pages, 7 figures. Flavor Physics & CP Violation Conference, Taipei, 2008

References in corpus (17)

• Observation of a Broad Structure in the ${\pi }^{+}{\pi }^{-}J/\psi$ Mass Spectrum around 4.26 GeV/$c^2$
• Observation of a resonance-like structure in the pi^+- psi' mass distribution in exclusive B-->K pi^+- psi' decays
• Observation of Two Resonant Structures in e+e- to pi+ pi- psi(2S) via Initial State Radiation at Belle
• Measurement of e^+e^- to pi^+pi^-J/psi Cross Section via Initial State Radiation at Belle
• Evidence of a Broad Structure at an Invariant Mass of 4.32 GeV/$c^2$ in the Reaction $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\psi (2S)$ Measured at BaBar
• Charmonium Decays of $Y(4260), psi(4160), and psi(4040)
• Search for new charmonium states in the processes e+ e- --> J/psi D(*) D(*) at sqrt{s} ~ 10.6 GeV
• Observation of Y(3940) -> J/psi omega in B -> J/psi omega K at BABAR
• Study of Resonances in Exclusive B Decays to Dbar(*)D(*)K
• Measurement of the near-threshold $e^{+}{e}^{-}\to D\bar{D}$ cross section using initial-state radiation
• Search for B+ --> X(3872) K+, X(3872) --> J/psi gamma
• Determination of the $\psi (3770)$, $\psi (4040)$, $\psi (4160)$ and $\psi (4415)$ resonance parameters
• Measurement of the near-threshold $e^{+}{e}^{-}\to D^{(\ast )\pm }D{}^{\ast \mp }$ cross section using initial-state radiation
• Study of the Exclusive Initial-State Radiation Production of the $D\bar{D}$ System
• Search for a Charged Partner of the X(3872) in the B Meson Decay B --> X- K, X- --> J/psi pi- pi0
• Observation of $\psi (4415)\to D\bar{D}{}_2^{\ast }(2460)$ decay using initial-state radiation
• Observation of psi(3770) --> gamma chi_c0