Calculation of the K^0-\bar{K}^0 mixing parameter via the QCD sum rules at finite energies
| Autor: | Andrei L. Kataev, A.B. Krasulin, K.G. Chetyrkin, A. A. Pivovarov |
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| Jazyk: | angličtina |
| Rok vydání: | 2001 |
| Předmět: |
Quantum chromodynamics
Physics Nuclear and High Energy Physics QCD sum rules Particle physics Unitarity High Energy Physics::Phenomenology FOS: Physical sciences Value (computer science) Symmetry (physics) High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) High Energy Physics::Experiment Mixing (physics) Energy (signal processing) Bar (unit) |
| Popis: | The QCD finite energy sum rules method is used to show that the parameter of the K^0-\bar{K}_0 mixing \hat{B} is mainly determined by the value of g m_s< \bar{d} G_{\mu\nu} \sigma_{\mu\nu} d > and the vacuum expectation values of four-quark operators. Assuming the hypothesis of vacuum dominance and/or unitarity symmetry to estimate latter, it is found that \hat{B}=1.2\pm 0.1. (The updated (March 2001) prediction reads \hat{B} = 1.0 +- 0.1 (for more details, see Comments after the main text). Comment: a literal copy of an old artcile with some comments included with the main text. We are doing this for easier access and, more importantly, to state our point: we believe that the result of our paper is relevant for the current phenomenology |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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