B+ and Ds+ Decay Constants from Belle and Babar

Abstract

The Belle and Babar experiments have measured the branching fractions for B+ -> tau+ nu and Ds+ -> mu+ nu decays. From these measurements one can extract the B+ and Ds+ decay constants, which can be compared to lattice QCD calculations. For the Ds+ decay constant, there is currently a 2.1 sigma difference between the calculated value and the measured value.

10 pages, 8 figures, 1 table, contribution to the Tenth Conference on the Intersections of Particle and Nuclear Physics (CIPANP 2009), San Diego, California

References in corpus (2)

• B and D Meson Decay Constants
• Measurement of B- -> tau- nu_tau-bar Decay With a Semileptonic Tagging Method

Cited by in corpus (3)

• Measuring V_ub and probing SUSY with double ratios of purely leptonic decays of B and D mesons
• New charged Higgs effects on ${\Gamma }_{K_{e2}}/{\Gamma }_{K_{\mu 2}}$, $f_{D_s}$ and $\mathcal{B}(B^{+}\to {\tau }^{+}\nu )$ in the Two-Higgs-Doublet model
• The CKM Matrix from Lattice QCD