New Baryons Discovered at CERN

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

by 0xbadf00d • 6 years ago

2 1 6 years ago

lhcb-public.web.cern.ch

gus_massa• 6 years ago

The interesting part if you are not interested in the business as usual part of particle physics is:

10 March 2020: B0 → K μ+ μ-: more data confirm old puzzle.*
Compared with the previous LHCb results, the overall tension with the Standard Model (SM) is observed to mildly increase.
However, the global fit to several angular observables shows that the overall tension with the SM increases from 3.0 to 3.3σ.

[Note that the "increase" in the second quote and the "increase" in the third quote are in different comparisons.]

The idea is that the transformation in the experiment is actually B0 → <something> → K* μ+ μ- , where there are many known versions of <something>. But they got a weird result, so there "must" be some unknown versions of <something>.

This is 3σ, that means that a random fluke has less than .3% of probability of producing a similar looking weird data. The problem is that they (and other groups) are running hundred of experiments, so there is a chance that this is just good/bad luck instead of a unknown <something>.

A 3σ is unusual enough to remember, and to try to explain it with new theories, but don't get to attached to a 3σ resonance because they may fade away.

New Baryons Discovered at CERN

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