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Lecture 15 – Next steps

Lecture 15 – Next steps. The Higgs boson Review of the Standard Model Problems of the Standard Model Proposed Solutions. The Standard Model. The Higgs boson. How do we look for the Higgs ? . Production mechanism. Dominant decay. b. b. b. Have we already found it ?.

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Lecture 15 – Next steps

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  1. FK7003 Lecture 15 – Next steps • The Higgs boson • Review of the Standard Model • Problems of the Standard Model • Proposed Solutions

  2. FK7003 The Standard Model

  3. FK7003 The Higgs boson

  4. FK7003 How do we look for the Higgs ? Production mechanism Dominant decay b b b

  5. FK7003 Have we already found it ? Lots of excitement around 2000/2001 as LEP reached the end of its life.

  6. FK7003 Observation of a Higgs ? An excess of events was seen at mass 115 GeV but reanalysis of data and rigorous statistical calculation of significance means it is impossible (and stupid) to conclude a Higgs was seen. Lower mass limitMH > 113.5 GeV (15.02)

  7. FK7003 Been here before - top quark non-discovery… • 1984 CERN • UA1 experiment • pp (630 GeV cm energy) • Something they would rather forget

  8. FK7003 Race for the Higgs

  9. FK7003 Where is the Higgs ?

  10. How good is the Standard Model ? * The focus of the rest of this lecture FK7003

  11. FK7003 Speculation strategy

  12. FK7003 How well can we localise a particle ?

  13. FK7003 Compton Wavelength

  14. FK7003 Gravity

  15. FK7003 Question

  16. FK7003 Other possible energy scales 1/coupling Electromagnetic E measurements Weak GUT scale Strong Log(Momentum transfer, Q(GeV) )

  17. FK7003 Speculation strategy 

  18. FK7003 Problems of the Standard Model

  19. FK7003 Supersymmetry (15.07)

  20. FK7003 Why look for SUSY ? Standard Model Standard Model+SUSY 1/coupling 1/coupling Electromagnetic E Electromagnetic Weak Weak Strong Strong Log(Momentum transfer, Q(GeV) ) Log(Momentum transfer, Q(GeV) )

  21. FK7003 Grand Unified Theories

  22. FK7003 Extra spatial dimensions

  23. FK7003 Micro Black Holes at the LHC

  24. FK7003 Electric charge quantisation

  25. Maxwell’s equations FK7003

  26. FK7003 Monopoles and charge quantisation z P qm q d qe x

  27. FK7003 Q

  28. FK7003 Dirac’s quantisation condition z P qm q d qe x

  29. FK7003 Speculation strategy  

  30. FK7003 So how close are we to a unified theory of all the forces ?

  31. FK7003 Summary • Higgs discovery would be confirmation of the Standard Model • Standard Model is incomplete • A range of proposed solutions exist which postulate the existence of ”new” particles which could be ”around the corner” at LHC energies.

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