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Archive for the '–' Category
Creating a Better Leaf | The New Yorker
May 29, 2022Particle’s surprise mass threatens to upend the standard model
May 29, 2022Hot news in ’22, but this was based on data collected by 2011!
https://www.nature.com/articles/d41586-022-01014-5
QT:{{”
Old experiment, new tricks
In the latest work, Kotwal and his collaborators aimed to take the most precise measurement ever of the W’s mass. The data had all been collected by 2011, when Fermilab’s Tevatron — a 6-kilometre-long circular machine that collided protons with antiprotons and was once the world’s most powerful accelerator — shut down. But the latest measurement would not have been possible back then, says Kotwal. Instead, it is the result of a steady improvement of techniques in data analysis, as well as the particle-physics community’s improved understanding of how protons and antiprotons behave in collisions. “Many of the techniques to achieve that kind of precision we had not even learned about by 2012.”
The team looked at roughly four million W bosons produced inside the CDF detector between 2002 and 2011 — a data set four times larger than the group used in an early measurement in 20122. The researchers calculated the energy of each decay electron by measuring how its trajectory bent in a magnetic field. One painstaking advance over the past decade improved the resolution of the trajectories from roughly 150 micrometres to less than 30 micrometres, says Kotwal.
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Testing Positive for the Coronavirus Overseas: What You Need to Know – The New York Times
May 29, 2022How America Reached One Million Covid Deaths – The New York Times
May 29, 2022Interesting that the CIA was able to anticipate the war accurately in Ukraine but could not predict more loss of American lives than in all our previous wars combined.
https://www.nytimes.com/interactive/2022/05/13/us/covid-deaths-us-one-million.html
