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Old 22-03-2019, 09:40 AM
gary
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LHC experiments shed light on why matter dominates over anti-matter

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."
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
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Old 22-03-2019, 09:49 AM
gary
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LHCb - Large Hadron Collider beauty experiment

http://lhcb-public.web.cern.ch/lhcb-....html#CPVcharm
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Old 22-03-2019, 10:02 AM
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Stonius (Markus)
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Wow, that's big! A fundamental question of physics. Would be good if this is true.

Markus
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Old 22-03-2019, 10:21 AM
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multiweb (Marc)
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Quote:
Originally Posted by gary View Post
LHCb - Large Hadron Collider beauty experiment

http://lhcb-public.web.cern.ch/lhcb-....html#CPVcharm

Quote:
In practice, the measurement consists in counting the numbers of D0 and D0 mesons decaying into K+K- or π+π- pairs which are present in the data sample recorded by LHCb in 2011-2018.
I always wondered how and where they store all this critical data recorded over the years. I assume they'd have it duplicated in many different geographic locations as well?
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Old 22-03-2019, 11:24 AM
gary
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Originally Posted by multiweb View Post
I always wondered how and where they store all this critical data recorded over the years. I assume they'd have it duplicated in many different geographic locations as well?
Hi Marc,

According to the CERN web site, they are producing about 75 petabytes
(which is 75,000 terabytes) of data from experiments per year.

A lot of it they say is stored on robotic magnetic tape storage systems,
something we discussed in this thread here :-
http://www.iceinspace.com.au/forum/s...d.php?t=172578

Quote:
Originally Posted by gary
A single robotic tape storage unit can hold up to 278 petabytes.
If the same data was stored on CD, it would take more than 397 million
of them and if they were stacked on top of each other they would
form a tower 476 km high.
See http://information-technology.web.ce...omputer-centre
(includes video of robotic tape storage)
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