"Electroweak theory"의 두 판 사이의 차이

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==introduction==
  
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*  Glashow-Weinberg-Salam model
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*  doublets of leptons and quarks => SU(2) symmetry
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*  W-boson mass causes some trouble
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*  Goldston boson
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*  [[Higgs mechanism]]
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==recipe==
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*  start with the local gauge symmetric SU(2) Lagrangian with massless gauge fields
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*  introduce the Higgs field
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*  break the local gauge symmetry in such a way by a new interaction between the Higgs field and gauge fields so as to generate terms in the Lagrangian that look like mass terms for gauge fields
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==adjoining U(1) symmetry==
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<math>\begin{pmatrix}\gamma \\Z^0 \end{pmatrix} = \begin{pmatrix}\cos \theta_W & \sin \theta_W \\-\sin \theta_W & \cos \theta_W \end{pmatrix} \begin{pmatrix}B^0 \\W^0 \end{pmatrix} </math>
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==weak interactions==
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*  massive gauge bosons
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**  W and Z bosons
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==consequences==
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*  neutral currents
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*  new mesons
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*  parity violating effects
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*  W and Z bosons
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==W-boson==
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*  massive charged spin 1 boson
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==Z-boson==
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*  massive neutral spin 1 boson
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==weak force==
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*  neutron beta decay
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*  muon decay
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*  high-energy neutrino collisions with matter
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==three classes of weak interactions==
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*  leptonic reactions
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*  semi-leptonic reactions
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*  hadronic weak reactions
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==Higgs mechanism==
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*  Higges field
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**  pervasive universal background field that modifies the simple electroweak gauge theory as the gravitational field caused by mass
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*  two initial charged massless weak field W, W^{+}
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**  mix with Higgs fields H^{+}, H^{-}
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**  W fields get mass
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*  two electrically neutral massless fields W^0, G^0
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**  mix with neutral Higgs field H^0
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**  Z-field massive neutral weak field
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*  resulting bosons
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**  W - massive charged spin 1
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**  Z- massive neutral spin 1 boson
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**  photon - massless spin 1
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**  Higgs - massive neutral scalar spin 0
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==related items==
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==encyclopedia==
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* http://en.wikipedia.org/wiki/Electroweak_interaction
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* http://en.wikipedia.org/wiki/Quantum_electrodynamics
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* http://en.wikipedia.org/wiki/Beta_decay
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* http://en.wikipedia.org/wiki/weak_force
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==expositions==
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* Kibble, T. W. B. ‘History of Electroweak Symmetry Breaking’. arXiv:1502.06276 [hep-Ex, Physics:hep-Ph, Physics:hep-Th, Physics:physics], 22 February 2015. http://arxiv.org/abs/1502.06276.
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==articles==
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* Hitoshi Murayama [http://arxiv.org/abs/hep-ex/9606001 Why do we want a linear collider], 1996
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[[분류:physics]]
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[[분류:math and physics]]
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[[분류:migrate]]
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==메타데이터==
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===위키데이터===
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* ID :  [https://www.wikidata.org/wiki/Q466416 Q466416]
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===Spacy 패턴 목록===
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* [{'LOWER': 'electroweak'}, {'LEMMA': 'interaction'}]
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* [{'LOWER': 'electroweak'}, {'LEMMA': 'force'}]

2021년 2월 17일 (수) 02:35 기준 최신판

introduction

  • Glashow-Weinberg-Salam model
  • doublets of leptons and quarks => SU(2) symmetry



recipe

  • start with the local gauge symmetric SU(2) Lagrangian with massless gauge fields
  • introduce the Higgs field
  • break the local gauge symmetry in such a way by a new interaction between the Higgs field and gauge fields so as to generate terms in the Lagrangian that look like mass terms for gauge fields



adjoining U(1) symmetry

\(\begin{pmatrix}\gamma \\Z^0 \end{pmatrix} = \begin{pmatrix}\cos \theta_W & \sin \theta_W \\-\sin \theta_W & \cos \theta_W \end{pmatrix} \begin{pmatrix}B^0 \\W^0 \end{pmatrix} \)




weak interactions

  • massive gauge bosons
    • W and Z bosons



consequences

  • neutral currents
  • new mesons
  • parity violating effects
  • W and Z bosons



W-boson

  • massive charged spin 1 boson



Z-boson

  • massive neutral spin 1 boson



weak force

  • neutron beta decay
  • muon decay
  • high-energy neutrino collisions with matter



three classes of weak interactions

  • leptonic reactions
  • semi-leptonic reactions
  • hadronic weak reactions



Higgs mechanism

  • Higges field
    • pervasive universal background field that modifies the simple electroweak gauge theory as the gravitational field caused by mass
  • two initial charged massless weak field W, W^{+}
    • mix with Higgs fields H^{+}, H^{-}
    • W fields get mass
  • two electrically neutral massless fields W^0, G^0
    • mix with neutral Higgs field H^0
    • Z-field massive neutral weak field
  • resulting bosons
    • W - massive charged spin 1
    • Z- massive neutral spin 1 boson
    • photon - massless spin 1
    • Higgs - massive neutral scalar spin 0



related items

encyclopedia


expositions

  • Kibble, T. W. B. ‘History of Electroweak Symmetry Breaking’. arXiv:1502.06276 [hep-Ex, Physics:hep-Ph, Physics:hep-Th, Physics:physics], 22 February 2015. http://arxiv.org/abs/1502.06276.


articles

메타데이터

위키데이터

Spacy 패턴 목록

  • [{'LOWER': 'electroweak'}, {'LEMMA': 'interaction'}]
  • [{'LOWER': 'electroweak'}, {'LEMMA': 'force'}]
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