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Charmed baryonium.

G Cotugno1, R Faccini, A D Polosa

  • 1Department of Physics, Università di Roma, La Sapienza, Piazzale A. Moro 2, Roma, I-00185, Italy.

Physical Review Letters
|May 21, 2010
PubMed
Summary
This summary is machine-generated.

Researchers reanalyzed data, suggesting Y(4630) and Y(4660) are the same state, Y(B). This state is likely a four-quark charmed baryonium, observed via initial state radiation (ISR).

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Quantum Chromodynamics

Background:

  • The nature of exotic hadrons, such as tetraquarks, remains a key area of investigation in particle physics.
  • Previous observations of Y(4630) and Y(4660) suggested distinct states, requiring further analysis for clarification.

Purpose of the Study:

  • To reanalyze published data for Y(4630) and Y(4660) using a consistent theoretical framework.
  • To determine if these resonances correspond to a single underlying state and investigate its properties.

Main Methods:

  • Consistent ansatz reanalysis of experimental data for Y(4630) --> Lambda(c) Lambda(c) and Y(4660) --> psi(2S)pi pi decays.
  • Analysis of the e+e- --> J/psi pi pi gamma(ISR) spectrum to determine branching ratios.

Main Results:

  • The Y(4630) and Y(4660) observations are attributed to a single state, Y(B), produced via initial state radiation (ISR).
  • Measured properties of Y(B): Mass = 4660.7+/-8.7 MeV, Width = 61+/-23 MeV.
  • Determined branching ratios, including B(Y(B)-->Lambda(c) Lambda(c))/B(Y(B)-->psi(2S)pi pi)=117+/-44, and established upper limits for other decay modes.

Conclusions:

  • The findings strongly support the hypothesis that Y(B) is the first observation of a charmed baryonium (a four-quark state).
  • Y(4350) and Y(B) are consistent with the ground state and first radial excitation of an l=1 state, respectively.