Observation of a narrow resonance of mass 2.46 GeV/c2 decaying to Ds*+π0 and confirmation of the DsJ*(2317) state

Abstract

Using 13.5 ${\mathrm{fb}}^{-1}$ of $e^{+}{e}^{-}$ annihilation data collected with the CLEO II detector, we have observed a narrow resonance decaying to $D_s^{*+}{\pi }^0$ with a mass near $2.46\mathrm{GeV}{/c}^2.$ The search for such a state was motivated by the recent discovery by the BaBar Collaboration of a narrow state at $2.32\mathrm{GeV}{/c}^2,$ the $D_{\mathrm{sJ}}^{*}{\mathrm{}\left(2317\right)\mathrm{}}^{+},$ that decays to $D_s^{+}{\pi }^0.$ Reconstructing the $D_s^{+}{\pi }^0$ and $D_s^{*+}{\pi }^0$ final states in CLEO data, we observe peaks in both of the corresponding reconstructed mass difference distributions, $\Delta {M(D}_s{\pi }^0{)=M(D}_s{\pi }^0\left)-{M(D}_s\right)$ and $\Delta {M(D}_s^{*}{\pi }^0{)=M(D}_s^{*}{\pi }^0\left)-{M(D}_s^{*}\right),$ both of them at values near $350\mathrm{MeV}{/c}^2.$ We interpret these peaks as signatures of two distinct states, the $D_{\mathrm{sJ}}^{*}{\mathrm{}\left(2317\right)\mathrm{}}^{+}$ plus a new state, designated as the $D_{\mathrm{sJ}}{\mathrm{}\left(2463\right)\mathrm{}}^{+}.$ Because of the similar $\Delta M$ 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 $〈\Delta {M(D}_s{\pi }^0)〉=350.0\mathrm{}\pm 1.2(\mathrm{stat})\pm 1.0(\mathrm{syst})\mathrm{MeV}{/c}^2$ for the $D_{\mathrm{sJ}}^{*}{\mathrm{}\left(2317\right)\mathrm{}}^{+}$ state, and

Keywords

• XMLNS
• WWW.W3.ORG/1998/MATH/MATHML
• INLINE
• HTTP
• MSUBSUP
• MSUP

This publication has 19 references indexed in Scilit:

• Observation of a Narrow Meson State Decaying toDs+π0at a Mass of2.32GeV/c2
  Physical Review Letters, 2003
• Review of Particle Properties
  Physical Review D, 2002
• Excited heavy-light systems and hadronic transitions
  Physical Review D, 2001
• Charmed Meson Spectroscopy
  Annual Review of Nuclear and Particle Science, 1995
• Observation of a new charmed strange meson
  Physical Review Letters, 1994
• Chiral effective action with heavy-quark symmetry
  Physical Review D, 1993
• Spectroscopy with heavy-quark symmetry
  Physical Review Letters, 1991
• Properties ofP-wave mesons with one heavy quark
  Physical Review D, 1991
• Mesons in a relativized quark model with chromodynamics
  Physical Review D, 1985
• Charm Spectroscopy via Electron-Positron Annihilation
  Physical Review Letters, 1976

Read more Read more

Cited by 411 articles