Issue |
EPL
Volume 98, Number 5, June 2012
|
|
---|---|---|
Article Number | 51001 | |
Number of page(s) | 3 | |
Section | The Physics of Elementary Particles and Fields | |
DOI | https://doi.org/10.1209/0295-5075/98/51001 | |
Published online | 06 June 2012 |
The Cabibbo-Kobayashi-Maskawa density matrices
LIP, Department of Physics, University of Coimbra - 3004-516 Coimbra, Portugal, EU
Received:
8
May
2012
Accepted:
24
May
2012
The flavor changing charged currents of the weak sector of the Standard Model are studied in the framework of a quantum statistical approach. The quantum superposition of same-type quarks, generated by the Cabibbo-Kobayashi-Maskawa matrix, is used to define three density matrices, one for each quark family. The properties of such density matrices are analyzed, in particular, the associated von Neumann entropy. It is proven that, due to the unitarity of the Cabibbo-Kobayashi-Maskawa matrix, the quantum mixtures of quarks resulting from the weak interaction do not increase entropy and, therefore, the violation of CP and T symmetries cannot be related to the second law of thermodynamics.
PACS: 12.15.Ff – Quark and lepton masses and mixing / 05.30.-d – Quantum statistical mechanics
© EPLA, 2012
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.