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arXiv · 1104.2025

Observation of the h_c(1P) using e^+e^- collisions above DDbar threshold

CLEO Collaboration·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. Napolitano·K. M. Ecklund·J. Insler·H. Muramatsu·C. S. Park·L. J. Pearson·E. H. Thorndike·S. Ricciardi·C. Thomas·M. Artuso·S. Blusk·R. Mountain·T. Skwarnicki·S. 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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Abstract

Using 586pb^-1 of e^+e^- collision data at E_CM = 4170MeV, produced at the CESR collider and collected with the CLEO-c detector, we observe the process e^+e^- --> pi^+ pi^- h_c(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 psi(2S) --> pi^0 h_c(1P), which we use for normalization. We also find evidence for e^+e^- --> eta h_c(1P) at 4170MeV at the 3sigma level, and see hints of a rise in the e^+e^- --> pi^+ pi^- h_c(1P) cross section at 4260MeV.

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CLEO Collaboration, 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. Napolitano, K. M. Ecklund, J. Insler, H. Muramatsu, C. S. Park, L. J. Pearson, E. H. Thorndike, S. Ricciardi, C. Thomas, M. Artuso, S. Blusk, R. Mountain, T. Skwarnicki, S. 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. 2011-08-30. Observation of the h_c(1P) using e^+e^- collisions above DDbar threshold. https://doi.org/10.1103/physrevlett.107.041803

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