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2024年10月30日

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

  • The cross sections for e+e-→π+πJ/ψ, π+πψ(2S), K+KJ/ψ, DD, D0D++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+πJ/ψ final state. In addition, there is another cluster of events at around 4.05GeV/c2. Two resonant structures are observed in the π+πψ(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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  • [1] . Aubert B et al (BaBar Collaboration). Phys. Rev. Lett.,2005, 95: 1420012. HE Q et al (CLEO Collaboration). Phys. Rev. D, 2006, 74:091104(R)3. YUAN C Z et al (Belle Collaboration). Phys. Rev. Lett.,2007, 99: 1820044. Aubert B et al (BaBar Collaboration). Phys. Rev. Lett.,2007, 98: 2120015. WANG X L et al (Belle Collaboration). Phys. Rev. Lett.,2007, 99: 1420026. Coan T E et al (CLEO Collaboration). Phys. Rev. Lett.,2006, 96: 1620037. YUAN C Z et al (Belle Collaboration). Phys. Rev. D, 2008,77: 011105(R)8. Osterfeld A et al (Crystal Ball Collaboration). Report No.SLAC-PUB-4160, 1986, unpublished9. BAI J Z et al (BES Collaboration). Phys. Rev. Lett., 2002,88: 10180210. Seth K K. Phys. Rev. D, 2005, 72: 01750111. Ablikim M et al (BES Collaboration). arXiv:0705.4500[hep-ex]12. Barnes T, Godfrey S, Swanson E S. Phys. Rev. D, 2005,72: 05402613. Charge-conjugate modes are included throughout this report14. Poling R (for CLEO Collaboration). arXiv:0606016 [hep-ex]15. Aubert B et al (BaBar Collaboration). arXiv:0607083 [hep-ex]16. Pakhlova G et al (Belle Collaboration). Phys. Rev. D, 2007,77: 011103(R)17. Pakhlova G et al (Belle Collaboration). Phys. Rev. Lett.,2007, 98: 09200118. Pakhlova G et al (Belle Collaboration). arXiv:0708.3313[hep-ex], Phys. Rev. Lett. (in press)19. Abashian A et al (Belle Collaboration). Nucl. Instr. and Methods in Phys. Res. Sect. A, 2002, 479: 11720. Kurokawa S, Kikutani E. Nucl. Instrum. Methods in Phys.Res. Sect. A, 2003, 499: 1, and other papers included in this volume21. Eichten E et al. Phys. Rev. D, 1980, 21: 20322. Olsen S L. arXiv:0801.1153 [hep-ex]23. For a recent review, see for example, Swanson E S. Phys.Rept., 2006, 429: 243; Klempt E, Zaitsev A. Phys. Rept.,2007, 454: 1
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Get Citation
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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Study of charmonium(-like) states via ISR at Belle

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

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The cross sections for e+e-→π+πJ/ψ, π+πψ(2S), K+KJ/ψ, DD, D0D++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+πJ/ψ final state. In addition, there is another cluster of events at around 4.05GeV/c2. Two resonant structures are observed in the π+πψ(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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