Observation of the eta_c(2S) in exclusive B-->K KsK-pi+ decays

Abstract

We report the observation of a narrow peak in the KsK-pi+ invariant mass distribution in a sample of exclusive B-->K KsK-pi+ decays collected with the Belle detector at the KEKB asymmetric energy e+e- collider. The measured mass of the peak is M=3654+-6(stat)+-8(syst) MeV/c^2 and we place a 90% confidence level upper limit on the width of Gamma<55 MeV/c^2. The properties agree with heavy-quark potential model expectations for the eta_c(2S), the n=2 singlet S charmonium state.

10 pages, 3 figures, submitted to Physical Review Letters

Cited by in corpus (97)

• Observation of a New Narrow Charmonium State in Exclusive B+-->K+ pi+pi- J/psi Decays
• Observation of a narrow charmonium-like state in exclusive B+ -> K+ pi+pi- J/psi decays
• Heavy quarkonium: progress, puzzles, and opportunities
• Higher Charmonia
• Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts
• The New Heavy Mesons: A Status Report
• Observation of a resonance-like structure in the pi^+- psi' mass distribution in exclusive B-->K pi^+- psi' decays
• Properties of heavy quarkonia and B_c mesons in the relativistic quark model
• Constituent quark model study of the meson spectra
• Observation of a near-threshold omega-J/psi mass enhancement in exclusive B-->K omega J/psi decays
• The Exotic XYZ Charmonium-like Mesons
• Quarkonia and their transitions
• Charmonium levels near threshold and the narrow state $X(3872) \to π^{+}π^{-}\jpsi$
• Exclusive Double-Charmonium Production from e^+ e^- Annihilation into a Virtual Photon
• The Upsilon spectrum and m_b from full lattice QCD
• B Decays as Spectroscope for Charmed Four-quark States
• Exotic hadrons: review and perspectives
• Coupled-channel model for charmonium levels and an option for X(3872)
• Search for new charmonium states in the processes e+ e- --> J/psi D(*) D(*) at sqrt{s} ~ 10.6 GeV
• New states above charm threshold
• Observation of h_c(^1P_1) State of Charmonium
• Observation of eta_c^{prime} Production in gamma gamma Fusion at CLEO
• Constituent quark model description of charmonium phenomenology
• Review of Heavy Quarkonium at weak coupling
• Measurements of the mass and width of the eta_c meson and of an eta_c(2S) candidate
• Canonical Charmonium Interpretation for Y(4360) and Y(4660)
• e^+ e^- Annihilation into J/psi + J/psi
• Charmonium Hybrid Production in Exclusive B Meson Decays
• Observation of the Decay B=> J/psi eta K and Search for X(3872)=> J/psi eta
• The ${\eta }_c(3654)$ and hyperfine splitting in charmonium
• Chromomagnetism, flavour symmetry breaking and S-wave tetraquarks
• Exclusive Double-Charmonium Production from e^+ e^- Annihilation into Two Virtual Photons
• Fine and Hyperfine Splittings of Charmonium and Bottomonium: An Improved Perturbative QCD Approach
• Study of $\psi (3686)\to {\pi }^0{h}_c,h_c\to \gamma {\eta }_c$ via ${\eta }_c$ exclusive decays
• Radiative transitions of heavy quarkonium states
• Heavy Meson Description with a Screened Potential
• Exchange Current Operators and Electromagnetic Dipole Transitions in Heavy Quarkonia
• Photon Transitions in ψ(2S) Decays to χ_{cJ}(1P) and η_c(1S)
• Annihilation Rate of Heavy $0^{-+}$ Quarkonium in Relativistic Salpeter Method
• Mass Spectra of Heavy Quarkonia and B_{c} Decay Constant for Static Scalar-Vector Interactions with Relativistic Kinematics
• B_{c} and heavy meson spectroscopy in the local approximation of the Schrodinger equation with relativistic kinematics
• Heavy Quarkonium
• Two-photon width of eta_c and eta'_c from Heavy-Quark Spin Symmetry
• Measurements of the Absolute Branching Fractions of $B^{\pm }\to K^{\pm }{X}_{c\bar{c}}$
• Observation of ${\eta }_c(2S)\to p\bar{p}$ and search for $X(3872)\to p\bar{p}$ decays
• A Systematic Study on Nonrelativistic Quarkonium Interaction
• Study of B-meson decays to eta_c K^(*), eta_c(2S) K^(*) and eta_c gamma K^(*)
• Study of charmonia in four-meson final states produced in two-photon collisions
• Study of B^{+-} -> K^{+-}(K_S K pi)^0 Decay and Determination of eta_c and eta_c(2S) Parameters
• Potential description of charmonium and charmed-strange mesons from lattice QCD
• The Lost Tribes of Charmonium
• Observation of eta_c(1S) and eta_c(2S) decays to K+ K- pi+ pi- pi0 in two-photon interactions
• Spontaneous breaking of the lepton number and invisible majoron in a 3-3-1 model
• B ->η_c K(η_c^\prime K) decays in QCD factorization
• An estimate of the flavour singlet contributions to the hyperfine splitting in charmonium
• Search for a Charmonium Assignment for the X(3872)
• $S$-wave resonance contributions to the $B_{(s)}^0\to {\eta }_c(2S){\pi }^{+}{\pi }^{-}$ in the perturbative QCD factorization approach
• Evidence for η_{c}(2S) in ψ(3686) \to γK_{S}^{0}K^{\pm}π^{\mp}π^{+}π^{-}
• Precise measurement of spin-averaged chi_{cJ}(1P) mass using photon conversions in psi(2S) -> gamma chi_{cJ}
• Search for the h_c meson in B^+- ->h_c K^+-
• The X(3872) Meson and "Exotic" Spectroscopy at CDF II
• The Productions and Strong Decays of $D_q(2S)$ and $B_q(2S)$
• Exclusive nonleptonic Bc-meson decays to S-wave charmonium states
• Hyperfine splitting and leptonic decay rates in heavy quarkonia
• Gluon condensate and c-quark mass in pseudoscalar sum rules at 3-loop order
• Search for psi(2S) -> gamma eta_c(2S) via fully reconstructed eta_c(2S) decays
• Open charm hadron spectroscopy at B-factories
• New puzzle in charmonium decays
• Search for ${\eta }_c^{\prime }$ decays into vector meson pairs
• Decay constants of the pseudoscalar charmonium and bottomonium
• Scalar and axial-vector mesons
• Non-relativistic quark-antiquark potential: spectroscopy of heavy-quarkonia and exotic SUSY quarkonia
• The weak $B$, $B_s$ and $B_c$ decays to radially excited states
• Masses of the η_c(nS) and η_b(nS) mesons
• Renormalized Quarkonium
• Production of the h_c and h_b and Implications for Quarkonium Spectroscopy
• Study on ${\eta }_{c2}({\eta }_{b2})$ electromagnetic decay into double photons
• Updated measurements of the M1 transition $\psi (3686)\to \gamma {\eta }_c(2S)$ with ${\eta }_c(2S)\to K\bar{K}\pi$
• Two-photon decay of pseudoscalar quarkonia
• Evidence for ${\eta }_c$(2S)$\to\pipieta$ decay
• New Results From CLEO and BES
• Charmonium at BES and CLEO-c
• An introduction to the quark model
• Theoretical Overview: The New Mesons
• New Particles from Belle
• Search for B+ -> J/psi eta' K+ and B0 -> J/psi eta' Ks0 Decays
• New charmonium-like states
• Heavy Quarkonia Results from CLEO
• Conference Summary (5th Int. Conf. on Hyperons, Charm, and Beauty Hadrons)
• Hadronic Physics and Exotics
• Heavy Quarkonia - A Review of the Experimental Status
• Recent issues in hadron spectroscopy
• Spectroscopy of Heavy Quarkonia
• Light hadron, Charmonium(-like) and Bottomonium(-like) states
• Radiative Decays of Vector Mesons with Light-Cone Sum Rules
• Topics in Meson Spectroscopy
• Charmonium Review