New charmonium-like states

Abstract

In recent years the B-factories and other machines have found evidence for a large number of new states with hidden charm: candidate h_c(1P), eta_c(2S), and chi_{c2}(2P) states; the well-established X(3872); enhancements called X(3940), Y(3940), and Y(4260); and a new structure at 4350 MeV. Various conventional-charmonium and more exotic interpretations of these data have been proposed. In this talk we review the current state of the experimental evidence and the prospects for clarifying the spectrum.

6 pages, 5 figures. To appear in the proceedings of Beauty 2006

References in corpus (34)

• The Cosmological Parameters 2006
• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• Observation of a narrow charmonium-like state in exclusive B+ -> K+ pi+pi- J/psi decays
• Observation of a New Narrow Charmonium State in Exclusive B+-->K+ pi+pi- J/psi Decays
• Diquark-Antidiquarks with Hidden or Open Charm and the Nature of X(3872)
• Observation of a Broad Structure in the ${\pi }^{+}{\pi }^{-}J/\psi$ Mass Spectrum around 4.26 GeV/$c^2$
• Observation of the Narrow State $X(3872)\to J/\psi {\pi }^{+}{\pi }^{-}$ in $\bar{p}p$ Collisions at $\sqrt{s}=1.96 \TeV$
• Observation and Properties of the X(3872) Decaying to J/psi pi+ pi- in p-p(bar) Collisions at sqrt(s) = 1.96 TeV
• Study of the B- --> J/psi K- pi+ pi- Decay and Measurement of the B- --> X(3872) K- Branching Fraction
• Observation of a near-threshold omega-J/psi mass enhancement in exclusive B-->K omega J/psi decays
• Observation of Double cc bar Production in e+ e- Annihilation at sqrt{s} ~ 10.6 GeV
• Charmonium Decays of $Y(4260), psi(4160), and psi(4040)
• Gluonic charmonium resonances at BaBar and Belle?
• Confirmation of the Y(4260) Resonance Production in ISR
• Observation of a Near-threshold $D^0{\bar{D}}^0{\pi }^0$ Enhancement in $B\to D^0{\bar{D}}^0{\pi }^{0}K$ Decay
• Measurement of Double Charmonium Production in $e^{+}{e}^{-}$ Annihilations at $\sqrt{s}=10.6$ GeV
• New states above charm threshold
• Observation of the eta_c(2S) in exclusive B-->K KsK-pi+ decays
• Measurement of the Dipion Mass Spectrum in X(3872) -> J/Psi Pi+ Pi- Decays
• Search for B+ --> X(3872) K+, X(3872) --> J/psi gamma
• Observation of h_c(^1P_1) State of Charmonium
• One Explanation for the Exotic State Y(4260)
• Observation of eta_c^{prime} Production in gamma gamma Fusion at CLEO
• Study of the X(3872) and Y(4260) in B0-->J/psi pi+ pi- K0 and B-->J/psi pi+ pi- K- decays
• Search for a Charged Partner of the X(3872) in the B Meson Decay B --> X- K, X- --> J/psi pi- pi0
• Measurements of the mass and width of the eta_c meson and of an eta_c(2S) candidate
• Possible Molecular Structure of the Newly Observed Y(4260)
• Charmonium's K2 peak
• Exclusive Production of the X(3872) in B Meson Decay
• Why Hybrid Meson Coupling to Two S-wave Mesons is Suppressed
• Determining the upper limit of Gamma_{ee} for the Y(4260)
• Observation of B+ -> psi(3770) K+
• Search for a Charmonium Assignment for the X(3872)
• The XYZs of Charmonium at BES

Cited by in corpus (2)

• Interference effects in the X(4260) signal
• Hidden and open charm at Belle (and elsewhere)