Extracting the light quark mass ratio m_u/m_d from bottomonia transitions
| Autor: | Guo, F.K., Hanhart, C., Meißner, U.-G. |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
mass difference [quark]
mass ratio [quark] High Energy Physics::Phenomenology FOS: Physical sciences postulated particle [bottomonium] mass [up] High Energy Physics - Experiment hadronic decay [Upsilon(10570)] High Energy Physics - Phenomenology High Energy Physics - Experiment (hep-ex) High Energy Physics - Phenomenology (hep-ph) mass [down] ddc:550 hadronic decay [chi mesons] width [Upsilon(10570)] High Energy Physics::Experiment singlet [spin] |
| Zdroj: | Physical review letters 105, 162001 (2010). doi:10.1103/PhysRevLett.105.162001 |
| DOI: | 10.48550/arxiv.1007.4682 |
| Popis: | We propose a new method to extract the light quark mass ratio $m_u/m_d$ using the $\Upsilon(4S)\to h_b\pi^0(\eta)$ bottomonia transitions. The decay amplitudes are dominated by the light quark mass differences, and the corrections from other effects are rather small, allowing for a precise extraction. We also discuss how to reduce the theoretical uncertainty with the help of future experiments. As a by-product, we show that the decay $\Upsilon(4S)\to h_b\eta$ is expected to be a nice channel for searching for the $h_b$ state. Comment: 4 pages, 1 figure. Version slightly shortened to match the published version in PRL |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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