First quenched results for the matrix elements of the B_{B_s} mixing parameter in the static limit from tmQCD

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dc.creatorPalombi, F.
dc.creatorPapinutto, M.
dc.creatorPena, C.
dc.creatorWittig, H.
dc.date2007-10-15
dc.date.accessioned2026-07-07T11:53:34Z
dc.date.available2026-07-07T11:53:34Z
dc.descriptionWe 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.
dc.description14 pages, 5 figures, Proceedings of the 25th International Symposium on Lattice Field Theory, Regensburg, Germany, 30 Jul - 4 Aug 2007
dc.identifierhttps://arxiv.org/abs/0710.2863
dc.identifierhttp://arxiv.org/abs/0710.2863
dc.identifierPoSLAT2007:366,2007
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/204587
dc.subjectHigh Energy Physics - Lattice
dc.titleFirst quenched results for the matrix elements of the B_{B_s} mixing parameter in the static limit from tmQCD
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