ZPEnergy.com - Experiment confirmed famous physics model

Physicists can rest easy--the Standard Model of Particle Physics is still in effect. More than 100 MIT students and professors jammed into Room 35-225 on Wednesday, April 11, to hear the long-anticipated results of a particle detection experiment designed to produce evidence that would confirm or reject the model, which outlines the elements of particle physics.

MIT postdoctoral associate Jocelyn Monroe, who worked on the experiment, prolonged the suspense, revealing the results about half an hour into her talk. The outcome? The standard model is still safe: The experiment confirms the model's prediction that there are only three types of neutrinos (tiny elementary particles that are components of atoms).

Some of the assembled crowd seemed disappointed that the foundation of particle physics had not been upended.

"This was such a big question. It would have changed everything" if they found evidence for a fourth neutrino, Monroe said last week, after her lecture.
Experiments done in the 1990s at the Liquid Scintillator Neutrino Detector (LSND) at the Los Alamos National Laboratory offered strong indirect evidence for the existence of a fourth neutrino, but the results were controversial. So another experiment, the Booster Neutrino Experiment (MinibooNE) was launched in late 2002 to try to replicate the results.

"It was very important to confirm or refute the LSND result," said Monroe, a Pappalardo Fellow who arrived at MIT last September and worked on the MinibooNE project as a graduate student at Columbia University.
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More: http://www.physorg.com/news96217250.html

Source: MIT


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