RECENT RESULTS ON |Vub|, |Vcb | AND MIXING FROM BaBar D. del Re
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B Decays and CP Violation from BABAR
We present some recent BABAR measurements of the magnitudes of the elements Vub and Vcb of the Cabibbo-Kobayashi-Maskawa quark-mixing matrix, and of the angles α and γ of the unitary triangle of the standard model of the electroweak interactions. Most of the measurements presented here are based on the full BABAR Υ(4S) dataset, consisting of about 467 × 106 BB pairs. Invited talk presented at t...
متن کاملNew DELPHI Results from Semileptonic b, c Decays
The value of the |Vcb| element in the CKM quark mixing matrix was computed from the differential decay width of the process B → D∗+l−ν, measured as a function of the product ω of the B and D∗ 4-velocities, using an inclusive method of D∗ reconstruction: |Vcb| = 41.70 ± 2.35(exp.)± 1.38(th.) × 10−3 A measurement of the ratio |Vub| |Vcb| has been obtained by using the reconstructed secondary hadr...
متن کاملPerspective on quark mass and mixing relations.
Recent data indicate that Vub ∼= λ ∼= (0.22), while mt seems to be 174 GeV. The relations md/ms ∼ ms/mb ∼ δ ∼ λ ≃ |Vcb| and mu/mc ∼ mc/mt ∼ δ ∼ λ ∼ |Vub| suggest that the down type sector is responsible for |Vus| and |Vcb|, while Vub comes from the up type sector. Five to six parameters might suffice to account for the ten quark mass and mixing parameters, resulting in specific power series rep...
متن کاملNew Results on Flavor Physics
Recent progress in flavor physics is discussed. In particular, I review theoretical and experimental developments relevant for semileptonic B decays and the determination of |Vcb| and |Vub|, for exclusive rare decays, for nonleptonic b → c decays and tests of factorization, and for D meson mixing. LBNL–49214
متن کاملA 1993 Look at the Lower Bound on the Top Quark Mass from CP Violation
We point out that the lower bound on mt from the CP violation parameter ǫK has increased considerably. Using Wolfenstein parametrization of the CKM matrix we derive an analytic expression for this bound as a function of | Vcb |, | Vub/Vcb | and the non-perturbative parameter BK . For BK ≤ 0.80, | Vcb |≤ 0.040 and | Vub/Vcb |≤ 0.10 we find mt > 130GeV . However, for BK ≤ 0.70, | Vcb |≤ 0.038 and...
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تاریخ انتشار 2003