Confirming the molecular nature of the $Z_b(10610)$ and the $Z_b(10650)$
| Autor: | Cleven, Martin, Wang, Qian, Guo, Feng-Kun, Hanhart, Christoph, Meißner, Ulf-G., Zhao, Qiang |
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| Rok vydání: | 2013 |
| Předmět: |
nonrelativistic [effective field theory]
High Energy Physics - Phenomenology High Energy Physics - Experiment (hep-ex) High Energy Physics - Phenomenology (hep-ph) higher-order [correction] radiative decay [Z/b(10610)] radiative decay [Z/b(10650)] FOS: Physical sciences ddc:530 branching ratio High Energy Physics - Experiment |
| Zdroj: | Physical review / D 87(7), 074006 (2013). doi:10.1103/PhysRevD.87.074006 |
| DOI: | 10.48550/arxiv.1301.6461 |
| Popis: | The decays of the $Z_b(10610)$ and the $Z_b(10650)$ to $\Upsilon(nS)\pi$, $h_b(mP)\pi$ and $\chi_{bJ}(mP)\gamma$ ($n=1,2,3$, $m=1,2$ and $J=0,1,2$) are investigated within a nonrelativistic effective field theory. It is argued that, while the decays to $\Upsilon(nS) \pi$ suffer from potentially large higher order corrections, the $P$-wave transitions of the $Z_b$ states offer the best possibility to confirm the nature of the $Z_b$ states as molecular states and to further study their properties. We give nontrivial and parameter-free predictions for the ratios of various partial widths for final states with $h_b(mP)\pi$ and $\chi_{bJ}(mP)\gamma$. In addition, the branching fractions for the neutral $Z_b$-states to $\chi_{bJ}\gamma$ are predicted to be of order $10^{-4}$--$10^{-3}$. This provides a fine test of the molecular nature in future high-luminosity experiments. Comment: 18 pages, 2 figures |
| Databáze: | OpenAIRE |
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