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                        Astronomy Picture of the Day

   [1]Discover the cosmos! Each day a different image or photograph of our
      fascinating universe is featured, along with a brief explanation
                    written by a professional astronomer.

                                2021 April 13
      [2]A picture of the center of the Flame Nebula is shown, with the
   bright star Alnitak off on the left. For more details, please read the
                                explanation.

                  Confirmed Muon Wobble Remains Unexplained
    Image Credit: [3]Fermi National Accelerator Laboratory; Photographer:
                                 Reidar Hahn

   Explanation: How fast do [4]elementary particles wobble? A
   [5]surprising answer to this seemingly inconsequential question came
   out of [6]Brookhaven National Laboratory in [7]New York, [8]USA in
   2001, and indicated that the [9]Standard Model of Particle Physics,
   adopted widely in physics, is incomplete. Specifically, the [10]muon, a
   particle with similarities to a heavy [11]electron, has had its
   relatively large wobble under scrutiny in a series of experiments known
   as [12]g-2 (gee-minus-two). The Brookhaven result galvanized other
   experimental groups around the world to confirm it, and pressured
   theorists to [13]better understand it. [14]Reporting in last week, the
   most sensitive [15]muon wobble experiment yet, conducted at [16]Fermi
   National Accelerator Laboratory ([17]Fermilab) in Illinois and
   [18]pictured here, agreed with the Brookhaven result. The
   [19]unexpected wobble rate may indicate that an ever-present sea of
   [20]virtual particles includes types not currently known.
   Alternatively, it [21]may indicate that flaws exist in [22]difficult
   theoretical prediction [23]calculations. Future runs at [24]Fermilab's
   g-2 experiment will further [25]increase precision and, possibly, the
   statistical difference between the [26]universe we measure and the
   [27]universe we understand.

                  Tomorrow's picture: supernova shock wave
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    Authors & editors: [39]Robert Nemiroff ([40]MTU) & [41]Jerry Bonnell
                                 ([42]UMCP)
          NASA Official: Phillip Newman [43]Specific rights apply.
              [44]NASA Web Privacy Policy and Important Notices
                A service of: [45]ASD at [46]NASA / [47]GSFC
                           & [48]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2104/Gminus2Ring_FNAL_7360.jpg
   3. https://www.fnal.gov/
   4. https://en.wikipedia.org/wiki/Elementary_particle
   5. https://www.bnl.gov/newsroom/news.php?a=112259
   6. https://www.bnl.gov/about/
   7. https://en.wikipedia.org/wiki/New_York_(state)
   8. https://www.cia.gov/the-world-factbook/countries/united-states/
   9. https://www.energy.gov/science/doe-explainsthe-standard-model-particle-physics
  10. http://hyperphysics.phy-astr.gsu.edu/hbase/particles/lepton.html#c3
  11. http://www.aip.org/history/electron/
  12. https://en.wikipedia.org/wiki/Muon_g-2
  13. http://www.bnl.gov/bnlweb/pubaf/pr/2001/g-2_backgrounder.htm
  14. https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.126.141801
  15. https://www.bnl.gov/newsroom/news.php?a=112261
  16. https://www.fnal.gov/pub/about/index.html
  17. https://youtu.be/R7O7WxHPKI8?t=135
  18. https://vms.fnal.gov/asset/detail?recid=1950114
  19. https://news.fnal.gov/2021/04/first-results-from-fermilabs-muon-g-2-experiment-strengthen-evidence-of-new-physics/
  20. https://math.ucr.edu/home/baez/physics/Quantum/virtual_particles.html
  21. https://www.scientificamerican.com/article/is-the-standard-model-of-physics-now-broken/
  22. https://www.forbes.com/sites/startswithabang/2021/04/08/why-you-should-doubt-new-physics-from-the-latest-muon-g-2-results/
  23. https://www.nas.nasa.gov/
  24. https://muon-g-2.fnal.gov/
  25. https://www.nytimes.com/2021/04/07/science/particle-physics-muon-fermilab-brookhaven.html
  26. https://media.gettyimages.com/photos/the-lab-technician-picture-id523520540?s=612x612
  27. https://i.pinimg.com/originals/2f/77/38/2f7738d8768201390955105e756733ce.jpg
  28. https://apod.nasa.gov/apod/ap210412.html
  29. https://apod.nasa.gov/apod/archivepix.html
  30. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  31. https://apod.nasa.gov/apod/lib/aptree.html
  32. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  33. https://apod.nasa.gov/apod/calendar/allyears.html
  34. https://apod.nasa.gov/apod.rss
  35. https://apod.nasa.gov/apod/lib/edlinks.html
  36. https://apod.nasa.gov/apod/lib/about_apod.html
  37. http://asterisk.apod.com/discuss_apod.php?date=210413
  38. https://apod.nasa.gov/apod/ap210414.html
  39. http://www.phy.mtu.edu/faculty/Nemiroff.html
  40. http://www.phy.mtu.edu/
  41. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  42. http://www.astro.umd.edu/
  43. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  44. https://www.nasa.gov/about/highlights/HP_Privacy.html
  45. https://astrophysics.gsfc.nasa.gov/
  46. https://www.nasa.gov/
  47. https://www.nasa.gov/centers/goddard/
  48. http://www.mtu.edu/