CP Violation in the Universe

Dear Colleagues,

In agreement with the Big Bang theory, the same quantity of matter and anti-matter must be created at the beginning of the universe. In addition, when matter and anti-matter collide, they annihilate producing photons. As a consequence of this primordial annihilation, the Universe is permeated of photons, this phenomenon is known as Cosmic Microwave Background. Up to date, we know that not all the matter and anti-matter annihilated was converted into photons, carrying out the so-called Baryon Asymmetry of the Universe (BAU).  On the other hand, according to Sakharov’s conditions, any successful theory of BAU must contain CP-violating processes.

In 1964 the CP violation was first observed in decays of neutral kaons, but not in enough amount to explain the observed BAU, but at least allowed to show that matter and anti-matter are intrinsically different. This CP-violating phenomenon was explained in the context of the Standard Model (SM), including the existence of a third generation of quarks, not seen up to that moment.

As is well known, the Standard Model must be incomplete and extra sources of CP violation must exist to explain BAU after the Big Bang. Therefore, several extensions of the SM have been proposed, and most of them contain additional sources of CP violation. Then, if any of these extensions is correct, the first proof of physics beyond the SM may come from searches of CP violation.

Research articles/review articles on experimental results as well as new phenomenological/theoretical ideas are welcome to be part of this Special Issue.

Prof. Dr. Choong Sun Kim
Dr. Jilberto Zamora-Saa
Guest Editors

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