Re-examining the $X(4630)$ resonance in the reaction $e^+e^-\rightarrow Λ^+_c\barΛ^-_c$

Ling-Yun Dai; Johann Haidenbauer; Ulf-G. Meißner

doi:10.1103/PhysRevD.96.116001

paper

Re-examining the $X (4630)$ resonance in the reaction $e^{+} e^{-} \to Λ_{c}^{+} Λ ˉ_{c}^{-}$

arXiv:1710.03142 · doi:10.1103/PhysRevD.96.116001

Abstract

The reaction $e^{+} e^{-} \to Λ_{c}^{+} Λ ˉ_{c}^{-}$ is investigated at energies close to the threshold with emphasis on the role played by the $X (4630)$ resonance. The interaction in the final $Λ_{c}^{+} Λ ˉ_{c}^{-}$ system, constructed within chiral effective field theory and supplemented by a pole diagram that represents a bare $X (4630)$ resonance, is taken into account rigorously. The pole parameters of the $X (4630)$ are extracted and found to be compatible with the ones of the $X (4660)$ resonance that have been established in the reaction $e^{+} e^{-} \to π^{+} π^{-} ψ (2 S)$ . The actual result for the $X (4630)$ is $M = (4652.5 \pm 3.4)$ MeV and $Γ = (62.6 \pm 5.6)$ MeV. Predictions for the $Λ_{c}^{+}$ electromagnetic form factors in the timelike region are presented.

11 pages, 3 figures

Re-examining the $X (4630)$ resonance in the reaction $e^{+} e^{-} \to Λ_{c}^{+} Λ ˉ_{c}^{-}$

Abstract

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Re-examining the X(4630) resonance in the reaction e+e−→Λc+​Λˉc−​

Abstract

References in corpus (12)

Cited by in corpus (3)

Re-examining the $X (4630)$ resonance in the reaction $e^{+} e^{-} \to Λ_{c}^{+} Λ ˉ_{c}^{-}$