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

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

2011-04-11

arxiv.org/abs/1104.2025v2

Phys.Rev.Lett.107:041803,2011

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, 4 figures, as published

Scientific paper

10.1103/PhysRevLett.107.041803

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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