Revisiting radiative decays of $$1^{+-}$$ 1 + - heavy quarkonia in the covariant light-front approach
| Autor: | Yan-Liang Shi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | European Physical Journal C: Particles and Fields, Vol 77, Iss 4, Pp 1-12 (2017) |
| Druh dokumentu: | article |
| ISSN: | 1434-6044 1434-6052 |
| DOI: | 10.1140/epjc/s10052-017-4818-5 |
| Popis: | Abstract We revisit the calculation of the width for the radiative decay of a $$1^{+-}$$ 1 + - heavy $$Q \bar{Q}$$ Q Q ¯ meson via the channel $$1^{+-} \rightarrow 0^{-+} +\gamma $$ 1 + - → 0 - + + γ in the covariant light-front quark model. We carry out the reduction of the light-front amplitude in the non-relativistic limit, explicitly computing the leading and next-to-leading order relativistic corrections. This shows the consistency of the light-front approach with the non-relativistic formula for this electric dipole transition. Furthermore, the theoretical uncertainty in the predicted width is studied as a function of the inputs for the heavy-quark mass and wave function structure parameter. We analyze the specific decays $$h_{\mathrm{c}}(1P) \rightarrow \eta _{\mathrm{c}}(1S) + \gamma $$ h c ( 1 P ) → η c ( 1 S ) + γ and $$h_{\mathrm{b}}(1P) \rightarrow \eta _{\mathrm{b}}(1S) + \gamma $$ h b ( 1 P ) → η b ( 1 S ) + γ . We compare our results with experimental data and with other theoretical predictions from calculations based on non-relativistic models and their extensions to include relativistic effects, finding reasonable agreement. |
| Databáze: | Directory of Open Access Journals |
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