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

Abstract

Using 13.5 inverse fb of e+e- annihilation data collected with the CLEO II detector we have observed a narrow resonance in the Ds*+pi0 final state, with a mass near 2.46 GeV. The search for such a state was motivated by the recent discovery by the BaBar Collaboration of a narrow state at 2.32 GeV, the DsJ*(2317)+ that decays to Ds+pi0. Reconstructing the Ds+pi0 and Ds*+pi0 final states in CLEO data, we observe peaks in both of the corresponding reconstructed mass difference distributions, dM(Dspi0)=M(Dspi0)-M(Ds) and dM(Ds*pi0)=M(Ds*pi0)-M(Ds*), both of them at values near 350 MeV. We interpret these peaks as signatures of two distinct states, the DsJ*(2317)+ plus a new state, designated as the DsJ(2463)+. Because of the similar dM values, each of these states represents a source of background for the other if photons are lost, ignored or added. A quantitative accounting of these reflections confirms that both states exist. We have measured the mean mass differences <dM(Dspi0)> = 350.0 +/- 1.2 [stat] +/- 1.0 [syst] MeV for the DsJ*(2317) state, and <dM(Ds*pi0)> = 351.2 +/- 1.7 [stat] +/- 1.0 [syst] MeV for the new DsJ(2463)+ state. We have also searched, but find no evidence, for decays of the two states via the channels Ds*+gamma, Ds+gamma, and Ds+pi+pi-. The observations of the two states at 2.32 and 2.46 GeV, in the Ds+pi0 and Ds*+pi0 decay channels respectively, are consistent with their interpretations as (c anti-strange) mesons with orbital angular momentum L=1, and spin-parities of 0+ and 1+.

16 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS, version to be published in Physical Review D; minor modifications and fixes to typographical errors, plus an added section on production properties. The main results are unchanged; they supersede those reported in hep-ex/0305017

References in corpus (2)

• Observation of a Narrow Meson Decaying to Ds+pi0 at a Mass of 2.32 GeV/c^2
• Observed D_s(2317) and tentative D(2100-2300) as the charmed cousins of the light scalar nonet

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• Quarkonia & Pentaquarks
• The SELEX Measurements in the Unified Picture for Hadron Spectra
• Strong and electromagnetic decays of the radially excited $D_s$ and $B_s$ mesons in light cone QCD sum rules
• Charm and Charmonium Spectroscopy
• P-Wave Charm Mesons as a Window to the D_{sJ} States
• Experimental status of excited $D_s^{+}$ mesons
• On the Recent Results of E835 Experiment at FNAL
• Hadron and Quarkmonium Exotica
• Analysis of the hadronic molecules $DK$, $D^{\ast }K$, $D{K}^{\ast }$ and their bottom analogs with QCD sum rules
• Heavy-light charm mesons spectroscopy and decay widths
• Predicting charmed-strange molecular tetraquarks with $K^{(\ast )}$ and $T$-doublet charmed or anticharmed meson
• Exotic hadrons associated with $b$-quark
• Observation of the radiative decay $D_s(2317{)}^{+}\to D_s^{\ast }\gamma$
• Systematic exploration of triply heavy tetraquarks: spectroscopic and decay characteristics
• Proposed mixing between $2P$ and $1F$ wave charmonia
• First measurement of ${\mathrm{D}}_{s1}(1^{+})(2536{)}^{+}$ and ${\mathrm{D}}_{s2}^{\ast }(2^{+})(2573{)}^{+}$ production in proton-proton collisions at $\sqrt{s}=13$ TeV at the LHC
• Understanding open-charm mesons
• Chiral shifts in heavy-light mesons
• Meson scattering and tetraquarks in two-dimensional QCD
• Summary of Experimental Meson Physics