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![Page 1: 1 Erik Johansson Athens 2010 Particle collisions and antimatter In the ATLAS Experiment Erik Johansson Stockholm University.](https://reader035.fdocuments.us/reader035/viewer/2022070414/5697c00c1a28abf838cc91a6/html5/thumbnails/1.jpg)
1Erik Johansson Athens 2010
Particle collisions and antimatter
In the ATLAS Experiment
Erik JohanssonStockholm University
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ATLAS
3.5 + 3.5 TeV
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The colossal ATLAS detector at CERN
People
http://atlas.ch
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4Erik Johansson Athens 2010
Learning with ATLAS
ATLAS particle collisions
for teachers and students
Learning with ATLAS@CERN
http://www.learningwithatlas-portal.eu/sv
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5Erik Johansson Athens 2010
Students and ATLAS
• Take part in an world-wide particle physics experiment• Use the same data, same tools and methods as the
physicists• Explore the invisible particle world• In our surrounding we experience protons, neutrons
and electrons, but there are many more....• At the Big Bang they were all needed to give rise to the
present universe
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6Erik Johansson Athens 2010
Particle collisions in ATLAS
December 2009 datataking
A neutral strange particle produced in a proton-proton collision, and decaying in the Inner Detector of ATLAS
Students can determine its mass and lifetime
http://www.learningwithatlas-portal.eu/sv
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7Erik Johansson Athens 2010
Some Special Relativity
• Reconstructing invisible particles• Some special relativity
E2 = p2c2 + m2c4
Rest energy: E = mc2
M = square root (E2/c4- p2/c2)where E is the total energy and p is the total momentum (vector sum) of the produced particles
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9Erik Johansson Athens 2010
New Physics Brochure
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10Erik Johansson Athens 2010
ATLAS on other arenas
ATLAS on other arenas –
The Web, YouTube and Hollywoodfilm
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11Erik Johansson Athens 2010
ATLAS Homepage
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12Erik Johansson Athens 2010
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13Erik Johansson Athens 2010
Five minutes about the LHC. Much filmed inside ATLAS cavern (with a few “enhancements”).
Film is now on DVD with an extra about CERN and ATLAS
Through two trips to the headquarters of Sony Pictures in Los Angeles, we negotiated to have a 15-minute extra on the DVD.
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14Erik Johansson Athens 2010
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15Erik Johansson Athens 2010
1/2 gram of antimatter
• ½ g of antimatter is a huge amount of antimatter• Will take ATLAS 10 million years to produce it
– Difficult to put it in a container
• 1 g of matter corresponds to around 6 1014 J.– Order of magnitude: World War 2 atomic bomb
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16Erik Johansson Athens 2010
ATLAS and Antimatter
• Antimatter and Other Mysteries in the ATLAS Experiment– 24 page brochure
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17Erik Johansson Athens 2010
Student projects
• What is antimatter?• How is antimatter produced in ATLAS?• How would you transport antimatter?• How much energy does 1 g of matter (½ g of antimatter
and ½ g of matter) correspond to?• How much is that compared to a nuclear bomb?• How many people’s yearly anergy consumtion does it
correspond to?• How much mass does 7+7 TeV energy correspond to?• Compare it with a stellar black hole.
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19Erik Johansson Athens 2010
Microscopic Black Holes
• 14 TeV collisions at the Large Hadron Collider– corresponds to around 3 10-23 kg
• A stellar black hole > 10 solar masses, 2 1031 kg• Particularly light black holes emit Hawking radiation
– Hawking 1974
• A microscopic black hole would evaporate immediately
• It would not gobble up CERN, Canton de Genève, Switzerland....
• For journalists the end of the world is a great story
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Simulated Microscopic Black Hole
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21Erik Johansson Athens 2010
ATLAS particle collisions excite students
Make a determination of the mass and the short lifetime, 10-10 s of a ‘strange’ particle
Making the invisible visible is an exiting challenge
The new arenas – web, YouTube, Hollywood film create exceptional opportunities
The majority of your students have seen ‘Angels and Demons’
Summary