1. 1 Erik Johansson Athens 2010 Particle collisions and antimatter In the ATLAS Experiment Erik Johansson Stockholm University

2. ATLAS 3.5 + 3.5 TeV

3. The colossal ATLAS detector at CERN People http://atlas.ch

4. 4 Erik Johansson Athens 2010 Learning with ATLAS ATLAS particle collisions for teachers and students Learning with ATLAS@CERN http://www.learningwithatlas-portal.eu/sv

5. 5 Erik 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

6. 6 Erik 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

7. 7 Erik Johansson Athens 2010 Some Special Relativity Reconstructing invisible particles Some special relativity E 2 = p 2 c 2 + m 2 c 4 Rest energy: E = mc 2 M = square root (E 2 /c 4 - p 2 /c 2 ) where E is the total energy and p is the total momentum (vector sum) of the produced particles

9. 9 Erik Johansson Athens 2010 New Physics Brochure

10. 10 Erik Johansson Athens 2010 ATLAS on other arenas ATLAS on other arenas – The Web, YouTube and Hollywoodfilm

11. 11 Erik Johansson Athens 2010 ATLAS Homepage

12. 12 Erik Johansson Athens 2010

13. 13 Erik 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.

14. 14 Erik Johansson Athens 2010

15. 15 Erik 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 10 14 J. –Order of magnitude: World War 2 atomic bomb

16. 16 Erik Johansson Athens 2010 ATLAS and Antimatter Antimatter and Other Mysteries in the ATLAS Experiment –24 page brochure

17. 17 Erik 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.

19. 19 Erik 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 10 31 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

20. Simulated Microscopic Black Hole

21. 21 Erik 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