Observation of the hc(1P) Using e⊃+e⊃- Collisions above the DD̄ Threshold

T. K. Pedlar, D. Cronin-Hennessy, J. Hietala, S. Dobbs, Z. Metreveli, K. K. Seth, A. Tomaradze, T. Xiao, L. Martin, A. Powell, G. Wilkinson, H. Mendez, J. Y. Ge, D. H. Miller, I. P J Shipsey, B. Xin, G. S. Adams, D. Hu, B. Moziak, J. NapolitanoK. M. Ecklund, J. Insler, H. Muramatsu, C. S. Park, L. J. Pearson, E. H. Thorndike, S. Ricciardi, C. Thomas, Marina Artuso, Steven Roy Blusk, R. Mountain, Tomasz Skwarnicki, Sheldon Stone, L. M. Zhang, G. Bonvicini, D. Cinabro, A. Lincoln, M. J. Smith, P. Zhou, J. Zhu, P. Naik, J. Rademacker, D. M. Asner, K. W. Edwards, K. Randrianarivony, G. Tatishvili, R. A. Briere, H. Vogel, P. U E Onyisi, J. L. Rosner, J. P. Alexander, D. G. Cassel, S. Das, R. Ehrlich, L. Gibbons, S. W. Gray, D. L. Hartill, B. K. Heltsley, D. L. Kreinick, V. E. Kuznetsov, J. R. Patterson, D. Peterson, D. Riley, A. Ryd, A. J. Sadoff, X. Shi, W. M. Sun, J. Yelton, P. Rubin, N. Lowrey, S. Mehrabyan, M. Selen, J. Wiss, J. Libby, M. Kornicer, R. E. Mitchell, M. R. Shepherd, C. M. Tarbert, D. Besson

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Using 586pb⊃-1 of e⊃+e⊃- collision data at E c.m.=4170MeV, produced at the Cornell Electron Storage Ring collider and collected with the CLEO-c detector, we observe the process e⊃+e⊃-→π⊃+π⊃-hc(1P). We measure its cross section to be 15.6±2.3±1.9±3.0pb, where the third error is due to the external uncertainty on the branching fraction of ψ(2S)→π0hc(1P), which we use for normalization. We also find evidence for e⊃+e⊃-→ηhc(1P) at 4170 MeV at the 3σ level and see hints of a rise in the e⊃+e⊃- →π⊃+π⊃-hc(1P) cross section at 4260 MeV.

Original languageEnglish (US)
Article number041803
JournalPhysical Review Letters
Issue number4
StatePublished - Jul 20 2011


ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Pedlar, T. K., Cronin-Hennessy, D., Hietala, J., Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Xiao, T., Martin, L., Powell, A., Wilkinson, G., Mendez, H., Ge, J. Y., Miller, D. H., Shipsey, I. P. J., Xin, B., Adams, G. S., Hu, D., Moziak, B., ... Besson, D. (2011). Observation of the hc(1P) Using e⊃+e⊃- Collisions above the DD̄ Threshold. Physical Review Letters, 107(4), [041803]. https://doi.org/10.1103/PhysRevLett.107.041803