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

2011

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

CLEO Collaboration, Pedlar, T. K., Cronin-Hennessy, D. et al.

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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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Then

M. Ablikim et al. (BESIII Collaboration), Phys. Rev. Lett. 104
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2010
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K. Nakamura et al. (Particle Data Group), J. Phys. G 37
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J. P. Lees et al. (BABAR Collaboration), (2011), arXiv:1102.4565 [hep-ex]
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I. Adachi et al. (Belle Collaboration), (2011), arXiv:1103.3419 [hep-ex]
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