The SVZ sum rules and the heavy quark limit for $��_{Q}$
| Autor: | Zhao, Zhen-Xing, Li, Run-Hui, Shi, Yu-Ji, Zhou, Si-Hong |
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| Rok vydání: | 2020 |
| Předmět: | |
| DOI: | 10.48550/arxiv.2005.05279 |
| Popis: | In this work, we evaluate the accuracy of the leading order results in Shifman-Vainshtein-Zakharov (SVZ) sum rules and the leading power results in the heavy quark limit for the mass of $��_{Q}$. Up to dim-5 condensate contributions are considered. By comparing with the experimental results, we find that the leading order results in SVZ sum rules can reach about 5\% accuracy both for $��_{b}$ and $��_{c}$, and it seems that better results can be obtained from the sum rules of the heavy quark limit both for $��_{b}$ and $��_{c}$. We re-check that the SVZ sum rules in the heavy quark limit coincide with the HQET sum rules. As a byproduct, we also have an exploratory discussion on the $ud$ diquark in $��_{Q}$. 10 pages, 3 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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