The document discusses the search for the Higgs boson particle at the Large Hadron Collider (LHC). It provides background on Peter Higgs and the Higgs mechanism that predicts the existence of the Higgs boson. It describes how the LHC collides protons to produce particles, focusing on strategies to discover the Higgs boson by analyzing decay products and looking for a peak in the invariant mass distribution. It outlines some of the main decay channels researchers will examine in the search.

1. http://www.slideshare.net/worldTC Last of the Particles? Search for Higgs at LHC

3. Mankind’s ancient question न तत सूयो भाति न चनदतारकं नेमा विदयूतॉ भानि कूतोयः यमगनिः तवमेब भानताम् अनूभाति सव॔ तसय भासा सव॔मिदम विभाति In the beginning there was no sun, neither did the moon shine, nor the stars, man made light was no where. It is Your light that lit up everything else, Every thing in this world shines from Your light Where did everything come from? What is everything made up of?

4. Physicists’ latest answer The Standard Model of Particle Physics

7. Feynman Diagrams This is more than just a picture !

10. Example

12. The LHC Z

13. LHC in ACTION

14. Proton Proton is a rather complex bag of quarks and gluons

15. Proton  Proton 7 TeV 7 TeV

16. parton  parton Z 500 GeV 100 GeV Two partons, usually with different momenta collide and often anihilate giving rise to other particlesin the final state Beam axis Note: parton = quark, antiquark or gluon

19. Higgs production at LHC

20. Higgs Decays search channels

21. * numbers are for barrel Silicon Tracker PbWO 4 ECAL solenoid 4Tesla field data taking starts 2007 ? Startup Luminosity 2X10 33 cm -2 /s that is: 10 fb -1 per year sampling brass HCAL MUON Chambers

22. The Tracker

23. The ECAL

25. The HCAL

26. The Muon Chamber

28. CMS in ACTION

29. Transverse slice through CMS detector Click on a particle type to visualise that particle in CMS Press “escape” to exit

30. h   Two clean electromagnetic clusters (For unconverted photons) Backgrounds: gg,qq   ,qg  q  @low luminosity jet-jet 10 5 events/s jet+photon 10 2 events/s 2 photon 1 event/12.5s Higgs 1 event/25s h  2photon 1 event/10,000s CMS Detector: schematic X-sectional view HCAL ECAL TRACKER two photon background gamma+jet background

31. h   mass peak   =646MeV events/50MeV m  for 130 GeV Higgs CMS full detector simulation. Ref: CMS Note 2003/033

32. H  ZZ  4  Clean, resolution better than 1GeV Discovery Luminosity:

33. Significance (or what we hope…)

34. You can do it too…

35. Impossible is possible!