Study of the Exclusive Initial-State Radiation Production of the $D\bar{D}$ System

Abstract

A study of exclusive production of the $D\bar{D}$ system through initial-state r adiation is performed in a search for charmonium states, where $D=D^0$ or $D^{+}$. The $D^0$ mesons are reconstructed in the $D^0\to K^{-}{\pi }^{+}$, $D^0\to K^{-}{\pi }^{+}{\pi }^0$, and $D^0\to K^{-}{\pi }^{+}{\pi }^{+}{\pi }^{-}$ decay modes. The $D^{+}$ is reconstructed through the $D^{+}\to K^{-}{\pi }^{+}{\pi }^{+}$ decay mode. The analysis makes use of an integrated luminosity of 288.5 fb${}^{-1}$ collected by the BaBar experiment. The $D\bar{D}$ mass spectrum shows a clear $\psi (3770)$ signal. Further structures appear in the 3.9 and 4.1 GeV/$c^2$ regions. No evidence is found for Y(4260) decays to $D\bar{D}$, implying an up per limit $\frac{\BR(Y(4260)\to D \bar D)}{\BR(Y(4260)\to J/ψπ^+ π^-)} < 7.6$ (95 % confidence level).

15 pages, 5 postscript figues, submitted to ICHEP2006

References in corpus (8)

• The Cosmological Parameters 2006
• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The New Heavy Mesons: A Status Report
• Observation of Two Resonant Structures in e+e- to pi+ pi- psi(2S) via Initial State Radiation at Belle
• Evidence of a Broad Structure at an Invariant Mass of 4.32 GeV/$c^2$ in the Reaction $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\psi (2S)$ Measured at BaBar
• Measurement of the near-threshold $e^{+}{e}^{-}\to D^{(\ast )\pm }D{}^{\ast \mp }$ cross section using initial-state radiation
• Determining the upper limit of Gamma_{ee} for the Y(4260)
• A Precision Determination of the D^0 Mass

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