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Observation of the h_c(1P) using e^+e^- collisions above DDbar threshold (1104.2025v2)

Published 11 Apr 2011 in hep-ex

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) --> pi⁰ 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.