First observation of a narrow charm-strange meson DsJ(2632) -> Ds eta and D0 K+

Abstract

We report the first observation of a charm-strange meson DsJ(2632) at a mass of 2632.6+/-1.6 MeV/c^2 in data from SELEX, the charm hadro-production experiment E781 at Fermilab. This state is seen in two decay modes, Ds eta and D0 K+. In the Ds eta decay mode we observe an excess of 49.3 events with a significance of 7.2sigma at a mass of 2635.9+/-2.9 MeV/c^2. There is a corresponding peak of 14 events with a significance of 5.3sigma at 2631.5+/-1.9 MeV/c^2 in the decay mode D0 K+. The decay width of this state is <17 MeV/c^2 at 90% confidence level. The relative branching ratio Gamma(D0K+)/Gamma(Dseta) is 0.16+/-0.06. The mechanism which keeps this state narrow is unclear. Its decay pattern is also unusual, being dominated by the Ds eta decay mode.

5 pages, 3 included eps figures. v2 as accepted for publication by PRL

References in corpus (10)

• Observation of a Narrow Meson Decaying to Ds+pi0 at a Mass of 2.32 GeV/c^2
• Observation of a Narrow Resonance of Mass 2.46 GeV/c^2 Decaying to D_s^*+ pi^0 and Confirmation of the D_sJ^* (2317) State
• Chiral Multiplets of Heavy-Light Mesons
• Excited Heavy-Light Systems and Hadronic Transitions
• Observation of the DsJ(2317) and DsJ(2457) in B decays
• Chiral Dynamics and Heavy Quark Symmetry in a Toy Field Theoretic Model
• Chiral effective action with heavy quark symmetry
• Precision measurements of the Lambda_c+ and D0 lifetimes
• Measurement of the Ds lifetime
• Production Asymmetry of $D_s$ from 600 GeV/c ${\Sigma }^{-}$ and ${\pi }^{-}$ beam

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