Our 500th episode: A review of the achievements at Fermilab

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Published on: July 24, 2019
Item number 5 of this podcast: “CDF and ZDero discover the top quark”. This photo was taken on March 2, 1995 of the crowd in Fermilab’s Ramsey Auditorium who came to hear the announcement of the discovery of the Top Quark. Your podcaster is the 12th person from the right on the 16th row from the front.

Today’s special, commemorative episode is a look back at some of the results achieved by scientists and engineers at Fermilab over 50-plus years of operation.  It is based on a photo essay that appeared in Fermilab News in 2017, our 50th year, entitled “Fifty years of discoveries and innovations.” I have selected 15 of the 50 for this extended, 14 minute podcast episode.

The original text was written by Troy Rummler. Most of the photographs were taken, over the years, by Fermilab’s outstanding photographer, Reidar Hahn. You can find the full article and all 50 photographs at http://tinyurl.com/fnal50.

Which way did it go? A view from the top

Categories: CDF, DZero, Energy Frontier
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Published on: February 20, 2019

This table summarizes the forward-backward asymmetry measurements in top quark-antiquark events at the Tevatron.

Over the last decade, measurements by the CDF and DZero collaborations of how top quarks flee the scene of the crime, the so-called “forward-backward asymmetry,” caused quite a stir as they clashed with then state-of-the-art theoretical predictions for the Tevatron. The disagreement tantalized physicists with visions of new, unexpected particles influencing the behavior of the top quark. Now, with the final, combined word from the experiments, Fermilab has placed a capstone on its study of the forward-backward asymmetry, and the measurements and theory now agree.

By Ziqing Hong and Jon Wilson

The article can be found here: http://news.fnal.gov/2017/12/which-way-did-it-go-a-view-from-the-top/

Light, heavy light, and asymmetry

Categories: DZero
Published on: June 13, 2017

Liang Han (U.S.T.C., Hefei, China), Chen Wang and Yifan Xiang (undergraduates at U.S.T.C.) and Siqi Yang (U.S.T.C. and now at U. of Iowa) are the primary analysts for this measurement.

DZero has used an asymmetry in dimuon events to measure the weak-force mixing angle sin2θW.

http://news.fnal.gov/2017/05/light-heavy-light-asymmetry/, by Leo Bellantoni

The most you can know

Categories: DZero, Energy Frontier
Published on: December 14, 2016

“Squeezing Water from a Rock” by Rebecca Gilbert

How much can you know from a limited data set? A look back of our estimates on the Top Quark mass when we had small amounts of data.

http://news.fnal.gov/2016/10/the-most-you-can-know/, by Leo Bellantoni

Matter and antimatter

Categories: DZero, Energy Frontier
Published on: October 13, 2016

No, really. It matters. Image: Harley Schwadron
No, really. It matters. Image: Harley Schwadron

DZero measured the difference in the rates of the decays B → μ ν D0 vs. B+ → μ+ ν D0.

http://news.fnal.gov/2016/09/matter-and-antimatter/, by Leo Bellantoni

Turn to the left, turn to the right!

Categories: DZero, Energy Frontier
Published on: August 31, 2016

The Blue Marble
The Blue Marble

How does the top quark spin? And what is spin, anyway?

http://news.fnal.gov/2016/08/turn-left-turn-right/, by Leo Bellantoni.

Theta and Tau, two generations later

Categories: DZero, Energy Frontier
Published on: May 22, 2016

How can the Bs0 (“bee sub ess, zero”), or indeed any particle have different lifetimes when decaying into different particles? Getting the right answer to this question started quite some time ago.

http://news.fnal.gov/2016/04/theta-tau-two-generations-later/, by Leo Bellantoni.

DZero discovers a new particle consistent with a tetraquark

Categories: Cosmic Frontier, DZero
Published on: March 1, 2016

A new observation of the 4-quark bound state.

http://news.fnal.gov/2016/02/dzero-discovers-a-new-particle-consistent-with-a-tetraquark/, by Dmitri Denisov and Paul Grannis: the co-spokespersons for the DZero experiment.

Spin correlations in top pair production

Categories: DZero, Uncategorized
Published on: January 26, 2016

Olena Karacheban, Slava Shary, Boris Tuchming, and SungWoo Youn

Measuring the spin of top quarks, and wet driveways.

http://news.fnal.gov/2016/01/spin-correlations-in-top-pair-production/, by Leo Bellantoni.

Two for the price of one

Categories: DZero, Energy Frontier
Published on: November 12, 2015

It is possible to create both a J/ψ (“Jay Sigh”) and an Υ (“OOPS-i-lon”) simultaneously. What we learn from these events has a lot to do with the way quarks are stuck together inside the proton.

http://www.fnal.gov/pub/today/archive/archive_2015/today15-11-12.html, by Leo Bellantoni.

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