Global CKM fits with the scan method
Abstract
We present results of unitary triangle fits based on the scan method. This frequentist approach employs Gaussian uncertainties for experimental quantities, but avoids assumptions about the distribution of theoretical errors. Instead, we perform a large number of fits, scanning over regions of plausible theory errors for each quantity. We retain those fits meeting a specific confidence level criterion, thereby constructing a region in the ρ_{̄η̄ plane using the "standard" measurements (CabibboKobayashiMaskawa matrix elements, sin2β, Bd ,s0 mixing, ∊K}). In addition we use branching fraction and CP asymmetry measurements of B decays to pseudoscalar pseudoscalar, pseudoscalar vector, vector vector, and a_{1} pseudoscalar final states to determine α, D^{(*)}K^{(*)} modes to determine γ, and D^{(*)}π and Dρ modes to determine 2β +γ. We parametrize individual decay amplitudes in terms of colorallowed tree, colorsuppressed tree, penguin, singlet penguin, electroweak penguin, as well as Wexchange and Wannihilation amplitudes. With this parametrization, we obtain a good fit to the measured branching fractions and CP asymmetries within the standard model ansatz, with no new physics contributions. This simultaneous fit allows us to determine, for the first time in a global fit, the correlation between α and β, as well as between γ and β.
 Publication:

Physical Review D
 Pub Date:
 February 2014
 DOI:
 10.1103/PhysRevD.89.033004
 arXiv:
 arXiv:1301.5867
 Bibcode:
 2014PhRvD..89c3004E
 Keywords:

 12.15.Hh;
 13.25.Hw;
 14.65.Fy;
 Determination of KobayashiMaskawa matrix elements;
 Decays of bottom mesons;
 Bottom quarks;
 High Energy Physics  Experiment;
 High Energy Physics  Phenomenology
 EPrint:
 10 pages, 8 figures, version uploaded to Phys. Rev. D