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The LHCb Experiment

The LHCb Experiment. T. Bowcock University of Liverpool For the LHCb Collaboration. Overview. Detector Design LHCb Components and Status Physics Summary. Detector Design(1) Goals. Simultaneous measurements of ,,, and  Exploration of B s sector Access to rare b-decays +….

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The LHCb Experiment

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  1. The LHCb Experiment T. Bowcock University of Liverpool For the LHCb Collaboration

  2. Overview • Detector Design • LHCb Components and Status • Physics • Summary LHCb Detector T. Bowcock

  3. Detector Design(1)Goals • Simultaneous measurements of ,,, and  • Exploration of Bs sector • Access to rare b-decays • +… LHCb Detector T. Bowcock

  4. h 1 r 0 0 1 Detector Design(2) a g b LHCb Detector T. Bowcock

  5. Detector Design(3)Forward Physics • O(1012)bbpairs/year • bb~500b • bb/ inelastic~5×10-3 • Pairs produced at small angles • Modest luminosity LHCb Detector T. Bowcock

  6. LHCb(1)Components Reversible field LHCb Detector T. Bowcock

  7. LHCb(2)Particle ID • ID 1-150GeV/c • RICH system divided into 2 detectors and 3 radiators: aerogel, C4F10, CF4 LHCb Detector T. Bowcock

  8. LHCb(3)RICH • Acceptance • 300 mrad RICH 1 • 120 mrad RICH 2 • Radiators:thickness L, refractive index n, angle c, /K threshold Aerogel C4F10 CF4 L 5 85 167 cm n 1.03 1.0014 1.0005 qc 242 53 32 mrad p 0.6 2.6 4.4 GeV K 2.0 9.3 15.6 GeV LHCb Detector T. Bowcock

  9. LHCb(4)Particle ID • 3s separation pK 3-80GeV/c • 2s separation pK 1-150GeV/c • # of detected photons • 7 Aerogel 33 C4F10 18 CF4 LHCb Detector T. Bowcock

  10. LHCb(5)Particle ID Bd + (a) Bs  DsK (g) LHCb Detector T. Bowcock

  11. LHCb(6)Vertexing • VELO LHCb Detector T. Bowcock

  12. LHCb(7)VELO Series of disks LHCb Detector T. Bowcock

  13. LHCb(8)VELO • Micron pn&nn • Rad tolerant • High resolution • Xs ~ 80 • 200,000 channels • Low occupancy LHCb Detector T. Bowcock

  14. LHCb(9)Trigger LHCb Detector T. Bowcock

  15. LHCb(10)Trigger LHCb Detector T. Bowcock

  16. LHCb(11)Status • LHCb Experiment Approved Sep 1998 • Technical Design Reports • Magnet • Calorimeter • Muon • RICH • VELO • Outer Tracker LHCb Detector T. Bowcock

  17. LHCb(12)Improving Performance • Reducing Material Budgets • VELO 0.19X0 0.04 • RICH1 0.14X0 0.05 • Tracking 0.27X0 0.11 • Beam Pipe • VELO: material, stations • RICH: Mirror • Tracking Stations • Trigger efficiencies LHCb Detector T. Bowcock

  18. Physics(1)2005 • BABAR, BELLE LHCb Detector T. Bowcock

  19. Physics(2)LHCb 2007/8 LHCb Detector T. Bowcock

  20. Sensitivity Relative to LHCb 1 year operation Atlas/CMS (1 year) BABAR 0.5ab-1 2002-2007 BTeV (1 year) LHCb (Value) s(Sin2b)Expt/s(Sin2b)LHCb 0.9/0.8 2.6 1.8 0.02 s(Sin2a)Expt/s(Sin2a)LHCb 1.8/3.0 3.2 0.4 ??? s(g)Expt/s(g)LHCb - - 1.0 10 s(-2dg+g) Expt /s(-2dg+g) LHCb - - 1.2 10 1.6/1.8 - 1.0 75 - 4.2 2.0 25K 1.2/1.6 - - 33 Physics(3)LHCb Performance LHCb Detector T. Bowcock

  21. Summary • Second generation b-physics experiment • “day-one” operation • Superb instrument for exploring possible deviations from SM in B sector • Preparation progressing well LHCb Detector T. Bowcock

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