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advanced_notions:elementary_particles [2018/03/29 09:15]
jakobadmin [Student]
advanced_notions:elementary_particles [2018/04/14 10:08] (current)
aresmarrero [Abstract]
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 ====== Elementary Particles ====== ====== Elementary Particles ======
  
-<tabbox Why is it interesting?> ​ 
  
-<​tabbox ​Layman?+<​tabbox ​Intuitive
  
   * A nice overview is given here: https://​profmattstrassler.com/​articles-and-posts/​particle-physics-basics/​the-known-apparently-elementary-particles/​   * A nice overview is given here: https://​profmattstrassler.com/​articles-and-posts/​particle-physics-basics/​the-known-apparently-elementary-particles/​
   * [[http://​www.ejsme.net/​articles/​52/​523.pdf|Why not start with quarks? Teachers investigate a learning unit on the subatomic structure of matter with 12-year-olds]] by Gerfried J. Wiener, Sascha M. Schmeling and Martin Hopf   * [[http://​www.ejsme.net/​articles/​52/​523.pdf|Why not start with quarks? Teachers investigate a learning unit on the subatomic structure of matter with 12-year-olds]] by Gerfried J. Wiener, Sascha M. Schmeling and Martin Hopf
   * [[https://​gravityandlevity.wordpress.com/​2015/​04/​11/​how-big-is-an-electron/​|How big is an electron?]] by Brian Skinner   * [[https://​gravityandlevity.wordpress.com/​2015/​04/​11/​how-big-is-an-electron/​|How big is an electron?]] by Brian Skinner
- 
- 
- 
  
   ​   ​
-<​tabbox ​Student+<​tabbox ​Concrete
 {{ :​advanced_notions:​elemparticles.png?​nolink |}} {{ :​advanced_notions:​elemparticles.png?​nolink |}}
  
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 <​cite>​http://​thep.housing.rug.nl/​sites/​default/​files/​theses/​Master%20thesis_Marco%20Boers.pdf</​cite>​ <​cite>​http://​thep.housing.rug.nl/​sites/​default/​files/​theses/​Master%20thesis_Marco%20Boers.pdf</​cite>​
 </​blockquote>​ </​blockquote>​
-<​tabbox ​Researcher+ 
 +<​tabbox ​Abstract 
 +<​blockquote>​A question not often addressed when discussing the standard model is how one describes physical 
 +particles. Taking the electron as an example, the assumption usually made is that the free Dirac 
 +spinor in the interacting theory, at asymptotic times, can be viewed as an electron since ‘the coupling 
 +switches off’. This would mean that what is being caught in a detector is really a free fermion. The 
 +problem here, of course, is that in QED and QCD the coupling does not switch off, and assuming 
 +it does so generates infrared divergences. As a result, the spinors do not become free even at 
 +asymptotic times [1, 2], nor do they ever become gauge invariant. [...] 
 + 
 + The physical picture is of a matter particle 
 +surrounded by a cloud of ‘photons’,​ neither of which are individually observable, but which together 
 +constitute a gauge invariant, physical particle. This description is nonlocal, which is an immediate 
 +consequence of gauge invariance, but observables calculated with our states are manifestly local and 
 +correctly reproduce classically expected physics. 
 + 
 +<​cite>​[[https://​arxiv.org/​abs/​0907.4071|Stability,​ creation and annihilation of charges in gauge theories]] by Anton Ilderton, Martin Lavelle, David McMullan</​cite>​ 
 + 
 + 
 +</​blockquote>​ 
 + 
 +----- 
   * http://​math.ucr.edu/​home/​baez/​qg-spring2003/​elementary/​   * http://​math.ucr.edu/​home/​baez/​qg-spring2003/​elementary/​
   * See http://​physics.stackexchange.com/​questions/​33350/​particle-as-a-representation-of-the-lorentz-group   * See http://​physics.stackexchange.com/​questions/​33350/​particle-as-a-representation-of-the-lorentz-group
   * [[http://​www.pnas.org/​content/​99/​1/​33.full.pdf|A closer look at the elementary fermions]] by Maurice Goldhaber   * [[http://​www.pnas.org/​content/​99/​1/​33.full.pdf|A closer look at the elementary fermions]] by Maurice Goldhaber
 +
 +-----
  
 <​blockquote>​ <​blockquote>​
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 </​blockquote>​ </​blockquote>​
  
-   +<​tabbox ​Why is it interesting?​
-<​tabbox ​Examples+
  
---Example1#+Elementary particles are the fundamental building blocks and also responsible for the fundamental interactions like electromagnetism. 
 +<tabbox FAQ
  
-  +--> How large is an elementary particle?#
-<--+
  
---> Example2:#+See https://​axelmaas.blogspot.de/​2018/​02/​how-large-is-elementary-particle.html?​m=1 
 +<--
  
- +-->Why do physicists believe that particles are pointlike?#​ 
 +see https://​physics.stackexchange.com/​questions/​41676/​why-do-physicists-believe-that-particles-are-pointlike
 <-- <--
   ​   ​
advanced_notions/elementary_particles.1522307758.txt.gz · Last modified: 2018/03/29 07:15 (external edit)