The hypothesis of a real Cabibbo Kobayashi Maskawa matrix
P. Checchia (I.N.F.N., Padova, Italy), E. Piotto (University of, Milano, Milano, Italy) F. Simonetto (University of Padova, Padova, Italy)
TL;DR
This paper investigates the hypothesis that the CKM matrix is real, using statistical methods and new data analysis techniques, and finds that current measurements disfavor this hypothesis.
Contribution
It introduces a novel statistical approach and a new method to incorporate Bs meson oscillation data to better estimate CKM parameters.
Findings
The real CKM matrix hypothesis is disfavored by current measurements.
A new statistical method improves confidence level calculations.
Incorporating Bs meson oscillations reduces errors in parameter estimation.
Abstract
The hypothesis of a real Cabibbo-Kobayashi-Maskawa matrix has been considered and found to be disfavoured by present measurements even when neglecting results from CP violation in neutral Kaon decay. The Best Linear Unbiased Estimator has been used as a statistical approach to compute the Confidence Level. A new way to take into account the information from Bs mesons oscillations has been considered, reducing considerably the error on extractions of rho and eta parameter of the Wolfenstain parametrization of the matrix.
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Taxonomy
TopicsMatrix Theory and Algorithms