Measurements of the $ρ$ and $η$ parameters of the $V_{CKM}$ matrix and perspectives

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dc.creatorPaganini, P.
dc.creatorParodi, F.
dc.creatorRoudeau, P.
dc.creatorStocchi, A.
dc.date1997-11-07
dc.date.accessioned2026-07-07T13:13:11Z
dc.date.available2026-07-07T13:13:11Z
dc.descriptionA review of the current status of the Cabibbo-Kobayashi-Maskawa matrix ($V_{CKM}$) is presented and a special emphasis is put on the determination of the $ρ$ and $η$ parameters. From this study it follows that, in the Standard Model, the $B^0_s$-$\bar{B^0_s}$ oscillation frequency, $Δm_s$, has to lie, with 68% C.L., between 6.5 ps$^{-1}$ and 15 ps$^{-1}$, and is below 21 ps$^{-1}$ at 95% C.L. If the interest of measuring $Δm_s$ is underlined, the importance of a precise determination of the B meson decay constant, $f_B$, is also stressed. It is proposed to obtain a precise value for this parameter from an accurate measurement of $f_D$, the D meson decay constant, using results from lattice QCD to relate D and B hadrons. A future Tau-Charm factory could accomplish this task. It is also shown that from the present measurements, assuming the validity of the Standard Model, an already accurate value of $sin 2β~=~ 0.67 ^{+0.12}_{-0.13}$ is obtained. Sofar no constraint can be obtained on $sin 2α$. The interest of having a direct measurement of $sin 2α$ and $sin 2β$ at B-factories or at other facilities is reminded. Finally constraints on SUSY parameters, in the framework of a given model, obtained from a precise measurement of the CKM matrix elements are analyzed.
dc.description32 pages
dc.identifierhttps://arxiv.org/abs/hep-ph/9711261
dc.identifierhttp://arxiv.org/abs/hep-ph/9711261
dc.identifierPhys.Scripta 58:556-569,1998
dc.identifierdoi:10.1088/0031-8949/58/6/003
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/229806
dc.subjectHigh Energy Physics - Phenomenology
dc.titleMeasurements of the $ρ$ and $η$ parameters of the $V_{CKM}$ matrix and perspectives
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