Observation of the h(c)(1P) Using e+ e- collisions above the DD threshold.

/ Authors

T. Pedlar, D. Cronin-Hennessy, J. Hietala, S. Dobbs, Z. Metreveli, K. Seth, A. Tomaradze, T. Xiao, L. Martin, A. Powell

and 70 more authors

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

/ Abstract

Using 586 pb(-1) of e+ e- collision data at E(c.m.) = 4170 MeV, produced at the Cornell Electron Storage Ring collider and collected with the CLEO-c detector, we observe the process e+ e- → π+ π- h(c)(1P). We measure its cross section to be 15.6±2.3±1.9±3.0 pb, where the third error is due to the external uncertainty on the branching fraction of ψ(2S) → π0 h(c)(1P), which we use for normalization. We also find evidence for e+ e- → ηh(c)(1P) at 4170 MeV at the 3σ level and see hints of a rise in the e+ e- → π+ π- h(c)(1P) cross section at 4260 MeV.

Journal: Physical review letters

DOI: 10.1103/PhysRevLett.107.041803