Frederick C. Luehring
High Energy Physics
Indiana University

Frederick Luehring, Indiana University High Energy Physics

Office Phone
Mobile Phone
gpg Public Key
Swain West 269
Luehring_pub.asc at IU
+41 22 767 1166
US number finds me worldwide
Luehring_pub.asc at CERN

Links to information about me and maintained by me:

Find my complete contact information here.
Find my vita in pdf format here.
My CERN web site is which just points back to this page.

What I do:

I work on the ATLAS project experimentally measures subatomic particles taking data at the LHC particle accelerator at CERN.

General Information About ATLAS, LHC, and CERN

CERN (The European Laboratory for Particle Physics) in Geneva, Switzerland is the world's largest particle physics laboratory and is home to the Large Hadronic Collider (LHC). The LHC is the largest particle accelerator ever built (and for that matter the largest scientific instrument ever built). If you are interested in learning about ATLAS and LHC take a look at the ATLAS educational pages for students and the general public here.

The ATLAS project is fundamental research into subatomic particles and the nature of the universe. The initial goal of the ATLAS experiment was to discover the long-sought Higgs boson predicted in a theory first published in 1964. The theory used a technique known as "spontaneous symmetry breaking" to allow particles to have non-zero masses in addition to predicting the existence of the Higgs boson. The theory was first published in October of that year in 3 independent papers with a total of six authors:

  1. Robert Brout
  2. Francois Englert
  3. Peter Higgs
  4. Gerald Guralnik
  5. Carl Hagen
  6. Thomas Kibble

On July 4, 2012 nearly 48 years later, the ATLAS experiment and its chief competitor the CMS experiment announced independent, clear observation of the Higgs boson - the final missing piece of the theory which had by then become so well verified and widely accepted that it became known as the "Standard Model".

Here is a map of the LHC site of the CERN site showing how LHC fits into the mountainous area around the CERN site near Geneva Switzerland:

Diagram of Large Hadronic Collider (LHC)

This is how the LHC site looks from the air:

Arial photograph of LHC

The ATLAS detector is buried underground and this is the building painted with a diagram of the detector is directly on the surface above the detector:

ATLAS experiment surface assembly building.

This drawing shows how the the ATLAS detector is installed 100 m underground:

Photograph of ATLAS experiment below surface cavern in which the ATLAS detetector resides

Here is an drawing showing the parts of ATLAS:

Drawing of ATLAS detector.

This picture of a tall man looking tiny in the middle of the enormous ATLAS toroid magnet system to gives you an idea of the size of the detector:

Drawing showing the large size of the ATLAS detector

Here is an event display of data recorded during LHC operation. The display shows what is very likely a Higgs boson decaying into 4 electrons via 2 intermediate Z bosons:

Picture of an LHC collision very likely showing a Higgs boson

After sifting though trillions and trillions of proton collisions, ATLAS found a small bump at ~126 GeV/c in a mass plot for events where 2 energetic photons are observed:

Plot of candidate Higgs event mass distribution

And even the though the height of the mass peak is small, there is less than 1 chance in a million of the bump being a random fluctuation. There really is a Higgs boson:

Plot showing mathematical significance of Higgs signal

Page created by Fred Luehring and last modified on August 4, 2015

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