Why is there so little naturally occurring anti-matter in the universe?
Physicists have run experiments using CERN's Large Hadron Collider
that have taken us a step closer to answering that question.
Quote:
Originally Posted by phys.org
Physicists in the College of Arts and Sciences at Syracuse University have confirmed that matter and antimatter decay differently for elementary particles containing charmed quarks.
Distinguished Professor Sheldon Stone says the findings are a first, although matter-antimatter asymmetry has been observed before in particles with strange quarks or beauty quarks.
He and members of the College's High-Energy Physics (HEP) research group have measured, for the first time and with 99.999-percent certainty, a difference in the way D0 mesons and anti-D0 mesons transform into more stable byproducts.
Mesons are subatomic particles composed of one quark and one antiquark, bound together by strong interactions.
"There have been many attempts to measure matter-antimatter asymmetry, but, until now, no one has succeeded," says Stone, who collaborates on the Large Hadron Collider beauty (LHCb) experiment at the CERN laboratory in Geneva, Switzerland. "It's a milestone in antimatter research."
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Story here :-
https://phys.org/news/2019-03-physic...verse.html#jCp
"CERN: Study sheds light on one of physics' biggest mysteries – why there's more matter than antimatter" by Marco Gersabeck,
The Conversation, here :-
https://phys.org/news/2019-03-cern-p...atter.html#jCp
Paper (free, pdf) ,"Observation of CP violation in charm decays"
by LHCb collaboration :-
https://cds.cern.ch/record/2668357/f...R-2019-006.pdf