Study of charmonium(-like) states via ISR at Belle

YUAN Chang-Zheng (for the Belle Collaboration)

doi:10.1088/1674-1137/32/6/010

Chinese Physics C> 2008, Vol. 32> Issue(6) : 452-454 DOI: 10.1088/1674-1137/32/6/010

Study of charmonium(-like) states via ISR at Belle

YUAN Chang-Zheng (for the Belle Collaboration)

Institute of High Energy Physics, CAS, Beijing 100049, China

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Abstract：
The cross sections for e⁺e－→π⁺π^－J/ψ, π⁺π^－ψ(2S), K⁺K^－J/ψ, DD, D⁰D^－+π⁺+c.c., D^*D+c.c., and D^*D^* are measured using data sample collected on or near the Υ(4S) resonance with the Belle detector at KEKB. A peak near 4.25GeV/c², corresponding to the so called Y(4260), is observed in π⁺π^－J/ψ final state. In addition, there is another cluster of events at around 4.05GeV/c². Two resonant structures are observed in the π⁺π^－ψ(2S) invariant mass distribution, one at 4361±9±9MeV/c² with a width of 74±15±10MeV/c², and another at 4664±11±5MeV/c² with a width of 48±15± 3MeV/c². The rich structures observed in all these final states indicate that our understanding of the vector charmonium states above the open charm threshold is still poor, let alone the other possible dynamics such as charmonium hybrids or final state re-scattering and so on.

References

[1]

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YUAN Chang-Zheng (for the Belle Collaboration). Study of charmonium(-like) states via ISR at Belle[J]. Chinese Physics C, 2008, 32(6): 452-454. doi: 10.1088/1674-1137/32/6/010

YUAN Chang-Zheng (for the Belle Collaboration). Study of charmonium(-like) states via ISR at Belle[J]. Chinese Physics C, 2008, 32(6): 452-454. doi: 10.1088/1674-1137/32/6/010 shu

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Received: 2008-01-21
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Study of charmonium(-like) states via ISR at Belle

Institute of High Energy Physics, CAS, Beijing 100049, China

Received Date: 2008-01-21

Accepted Date: 1900-01-01

Available Online: 2008-06-05

Abstract:

The cross sections for e⁺e－→π⁺π^－J/ψ, π⁺π^－ψ(2S), K⁺K^－J/ψ, DD, D⁰D^－+π⁺+c.c., D^*D+c.c., and D^*D^* are measured using data sample collected on or near the Υ(4S) resonance with the Belle detector at KEKB. A peak near 4.25GeV/c², corresponding to the so called Y(4260), is observed in π⁺π^－J/ψ final state. In addition, there is another cluster of events at around 4.05GeV/c². Two resonant structures are observed in the π⁺π^－ψ(2S) invariant mass distribution, one at 4361±9±9MeV/c² with a width of 74±15±10MeV/c², and another at 4664±11±5MeV/c² with a width of 48±15± 3MeV/c². The rich structures observed in all these final states indicate that our understanding of the vector charmonium states above the open charm threshold is still poor, let alone the other possible dynamics such as charmonium hybrids or final state re-scattering and so on.

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