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LHC's D-meson study wraps up antimatter 'flip' story

Researchers at the Large Hadron Collider have witnessed particles called D-mesons flipping from matter into antimatter and back.
Antimatter is identical to matter, but with opposite electric charge.
Such "oscillations" are well known among three other particle types, but this is the first time D-mesons have been seen doing it in a single study.
 
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LHC reveals hints of 'new physics' in particle decays

Large Hadron Collider researchers have shown off what may be the facility's first "new physics" outside our current understanding of the Universe.
Particles called D-mesons seem to decay slightly differently from their antiparticles, LHCb physicist Matthew Charles told the HCP 2011 meeting on Monday.
The result may help explain why we see so much more matter than antimatter.

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Charm quark
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Charming surprise

The CP violation in charm quarks has always been thought to be extremely small. So, looking at particle decays involving matter and antimatter, the LHCb experiment has recently been surprised to observe that things might be different. Theorists are on the case.
The study of the physics of the charm quark was not in the initial plans of the LHCb experiment, whose letter "b" stands for "beauty quark". However, already one year ago, the Collaboration decided to look into a wider spectrum of processes that involve charm quarks among other things.
The LHCb trigger allows a lot of these processes to be selected, and, among them, one has recently shown interesting features. Other experiments at b-factories have already performed the same measurement but this is the first time that it has been possible to achieve such high precision, thanks to the huge amount of data provided by the very high luminosity of the LHC.

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Charm Meson Decays
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Title: CP Violation and Mixing in Charm Meson Decays from BABAR
Authors: Chunhui Chen

Mixing and CP violation in charm meson decays provide a unique probe of possible physics beyond the standard model. In this paper, we give a brief review of the current measurements from the BABAR experiment.

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