Evidence for resonant structures in e+e-→π+π-hc

  • The cross sections of e+e-→π+π-hc at center-of-mass energies from 3.90 to 4.42 GeV were measured by the BESⅢ and the CLEO-c experiments. Resonant structures are evident in the e+e-→π+π-hc line shape. The fit to the line shape results in a narrow structure at a mass of (4216±18)MeV/c2 and a width of (39±32)MeV, and a possible wide structure of mass (4293±9)MeV/c2 and width (222±67)MeV. Here, the errors are combined statistical and systematic errors. This may indicate that the Y(4260) state observed in e+e-→π+π-J/ψ has a fine structure in it.
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  • [1] Aubert B et al. (BaBar collaboration). Phys. Rev. Lett., 2005, 95: 142001[2] YUAN C Z et al. (Belle collaboration). Phys. Rev. Lett., 2007, 99: 182004[3] Lees J P et al. (BaBar collaboration). Phys. Rev. D, 2012, 86: 051102(R)[4] LIU Z Q et al. (Belle collaboration). Phys. Rev. Lett., 2013, 110: 252002[5] Aubert B et al. (BaBar collaboration). Phys. Rev. Lett., 2007, 98: 212001[6] WANG X L et al. (Belle collaboration). Phys. Rev. Lett., 2007, 99: 142002[7] Aubert B et al. (BaBar collaboration). arXiv:1211.6271[8] Brambilla N et al. Eur. Phys. J. C, 2011, 71: 1534[9] Beringer J et al. (Particle Data Group). Phys. Rev. D, 2012, 86: 010001[10] Ablikim M et al. (BESⅢ collaboration). Nucl. Instrum. Methods Phys. Res. Sect. A, 2010, 614: 345[11] Ablikim M et al. (BESⅢ collaboration). Phys. Rev. Lett., 2013, 111: 242001[12] Ablikim M et al. (BESⅢ collobarotion). Phys. Rev. Lett., 2010, 104: 132002[13] Pedlar T K et al. (CLEO collaboration). Phys. Rev. Lett., 2011, 107: 041803[14] Ablikim M et al. (BESⅢ collaboration). Phys. Rev. Lett., 2013, 110: 252001[15] For the three low statistics energy points, the χ2 is not well defined. We take the central values listed in Table 1 as nominal values, and vary the central values and statistical errors in a wide range to estimate the possible bias in this assumption. The bias is found to be small and is considered as systematic error of the results[16] ZHU K, MO X H, YUAN C Z, WANG P. Int. J. Mod. Phys. A, 2011, 26: 4511[17] WANG Q, Hanhart C, ZHAO Q. Phys. Rev. Lett., 2013, 111: 132003[18] DAI L Y, SHI M, TANG G Y, ZHENG H Q. arXiv:1206.6911 [hep-ph][19] YUAN C Z, WANG P, MO X H. Phys. Lett. B, 2006, 634: 399[20] Cleven M, WANG Q, GUO F K, Hanhart C, Meiner U G, ZHAO Q. arXiv:1310.2190 [hep-ph][21] LI X, Voloshin M B. arXiv:1309.1681 [hep-ph][22] Barnes T, Close F E, Swanson E S. Phys. Rev. D, 1995, 52: 5242; GUO P, Szczepaniak A P, Galata G, Vassallo A, Santopinto E. Phys. Rev. D, 2008, 78: 056003; Dudek J J, Rrapaj E. Phys. Rev. D, 2008, 78: 094504
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YUAN Chang-Zheng. Evidence for resonant structures in e+e-→π+π-hc[J]. Chinese Physics C, 2014, 38(4): 043001. doi: 10.1088/1674-1137/38/4/043001
YUAN Chang-Zheng. Evidence for resonant structures in e+e-→π+π-hc[J]. Chinese Physics C, 2014, 38(4): 043001.  doi: 10.1088/1674-1137/38/4/043001 shu
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Received: 2013-12-24
Revised: 1900-01-01
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Evidence for resonant structures in e+e-→π+π-hc

  • 1. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

Abstract: The cross sections of e+e-→π+π-hc at center-of-mass energies from 3.90 to 4.42 GeV were measured by the BESⅢ and the CLEO-c experiments. Resonant structures are evident in the e+e-→π+π-hc line shape. The fit to the line shape results in a narrow structure at a mass of (4216±18)MeV/c2 and a width of (39±32)MeV, and a possible wide structure of mass (4293±9)MeV/c2 and width (222±67)MeV. Here, the errors are combined statistical and systematic errors. This may indicate that the Y(4260) state observed in e+e-→π+π-J/ψ has a fine structure in it.

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