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High Energy Physics - Phenomenology

arXiv:1606.08317 (hep-ph)
[Submitted on 27 Jun 2016 (v1), last revised 28 Jun 2016 (this version, v2)]

Title:$η_c$ production associated with light hadrons at the B-factories and the future super B-factories

Authors:Qin-Rong Gong, Zhan Sun, Hong-Fei Zhang, Xue-Mei Mo
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Abstract:We present a complete study of the associated production of the $\eta_c$ meson with light hadrons in $e^+e^-$ collisions at the B-factory energy, which is demonstrated to be one of the best laboratories for testing the colour-octet (CO) mechanism. The colour-siglet contributions are evaluated up to $O(\alpha^2\alpha_s^3)$ while the CO ones are evaluated up to $O(\alpha^2\alpha_s^2)$. For the first time, the angular distribution of the $^1S_0^{[8]}$ production is studied at QCD next-to-leading order. We find that the $^1S_0^{[8]}$ channel dominate the total cross section, while the $^1P_1^{[8]}$ one exhibit its importance in the angular distribution, which turns out to be downward going with respect to $\mathrm{cos}\theta$. This can be considered as the most distinct signal for the CO mechanism.
Subjects: High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:1606.08317 [hep-ph]
  (or arXiv:1606.08317v2 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.1606.08317
Related DOI: https://doi.org/10.1140/epjc/s10052-016-4360-x

Submission history

From: Zhang Hong-Fei [view email]
[v1] Mon, 27 Jun 2016 15:33:39 UTC (109 KB)
[v2] Tue, 28 Jun 2016 04:48:27 UTC (92 KB)
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