تقرير
First quenched results for the matrix elements of the B_{B_s} mixing parameter in the static limit from tmQCD
| العنوان: | First quenched results for the matrix elements of the B_{B_s} mixing parameter in the static limit from tmQCD |
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| المؤلفون: | Palombi, F., Papinutto, M., Pena, C., Wittig, H. |
| المصدر: | PoSLAT2007:366,2007 |
| سنة النشر: | 2007 |
| المجموعة: | High Energy Physics - Lattice |
| مصطلحات موضوعية: | High Energy Physics - Lattice |
| الوصف: | We report on a non-perturbative study of the scale-dependent renormalization factors of a multiplicatively renormalizable basis of Delta B=2 parity-odd four-fermion operators in quenched lattice QCD. We also present some preliminary results of the matrix elements related to the mixing parameter of the B_s-meson. In our lattice formulation, the heavy quark is treated in the static approximation, while the strange one belongs to a doublet of twisted mass fermions at full twist, i.e. with twist angle alpha=pi/2. In this framework, the parity-even Delta B=2 four-fermion operators responsible for the mixing are rotated onto a linear combination of parity-odd operators in the above-mentioned basis. Their physical matrix elements between static B_s-mesons are extracted from lattice correlators with Schroedinger functional boundary conditions. We observe a suppression of excited state contributions to the B_{B_s} mixing parameter and speculate about possible explanations. Comment: 14 pages, 5 figures, Proceedings of the 25th International Symposium on Lattice Field Theory, Regensburg, Germany, 30 Jul - 4 Aug 2007 |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/0710.2863 |
| رقم الأكسشن: | edsarx.0710.2863 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |