Europhys. Lett.
Volume 47, Number 6, September 1999
Page(s) 656 - 662
Section The physics of elementary particles and fields
Published online 01 September 2002
DOI: 10.1209/epl/i1999-00439-9

Europhys. Lett, 47 (6), pp. 656-662 (1999)

A real CKM matrix?

P. Checchia 1, E. Piotto 2 and F. Simonetto 1

1 INFN Sezione di Padova and Dipartimento di Fisica, Università di Padova
Padova, Italy
2 INFN Sezione di Milano and Dipartimento di Fisica, Università di Milano
Milano, Italy

(received 1 February 1999; accepted in final form 13 July 1999)

PACS. 12.15Hh - Determination of Kobayashi-Maskawa matrix elements.
PACS. 14.65Fy - Bottom quarks.


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. This result agrees with most of the previous literature but contradicts statements reported in a recent paper.


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