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

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arxiv 1104.2025 v2 pith:X7JXKYU5 submitted 2011-04-11 hep-ex

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
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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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classification hep-ex
keywords crosssectionabovebranchingcesrcleo-ccollectedcollider
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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