ηc production associated with light hadrons at the B-factories and the future Super B-factories
| Autor: | Qin-Rong Gong, Xue-Mei Mo, Hong-Fei Zhang, Zhan Sun |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Quantum chromodynamics
Physics Particle physics Physics and Astronomy (miscellaneous) Meson 010308 nuclear & particles physics High Energy Physics::Phenomenology Hadron Order (ring theory) 01 natural sciences B-factory High Energy Physics - Phenomenology Angular distribution 0103 physical sciences High Energy Physics::Experiment Production (computer science) 010306 general physics Engineering (miscellaneous) Energy (signal processing) |
| Zdroj: | European Physical Journal C |
| Popis: | 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-singlet 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 dominates the total cross section, while the $$^1P_1^{[8]}$$ one exhibits 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. |
| Databáze: | OpenAIRE |
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