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Tom Whyntie 1 st year PhD student, High Energy Physics Group Supervisor: Professor Geoff Hall

Two Higgs are better than one: Physics at the Super Large Hadron Collider and the implications for the CMS Silicon Tracker. Tom Whyntie 1 st year PhD student, High Energy Physics Group Supervisor: Professor Geoff Hall. Outline of the talk. Why upgrade? Physics case

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Tom Whyntie 1 st year PhD student, High Energy Physics Group Supervisor: Professor Geoff Hall

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  1. Two Higgs are better than one:Physics at the Super Large Hadron Collider and the implications for theCMS Silicon Tracker Tom Whyntie 1st year PhD student, High Energy Physics Group Supervisor: Professor Geoff Hall

  2. Outline of the talk • Why upgrade? • Physics case • Higgs self-coupling measurement? • Upgrade challenges • The CMS silicon tracker • Tracker info in the level-1 Trigger? Questions at the end, please

  3. The Large Hadron Collider

  4. The Large Hadron Collider [1][2][3][4][5]

  5. Why increase the luminosity? • Statistics • Increase data rate  precision • Physics motivation • Improve SM precision • Improve “new physics” precision • Extend discovery reach • Sensitivity to rare processes [6][7][8] The question is: Where to look?

  6. Why increase the luminosity? • e.g. Trilinear coupling l precision: • SLHC (mH = 150-200GeV): ~20% • SLHC (mH = 120GeV): ~50-80% • Linear Collider: ~20% [9][10][11][12][13][14] s(HH) ~10fb

  7. Why upgrade to the SLHC? • LHC discoveries will need probing • SLHC - increase precision & reach • Present knowledge • Current infrastructure • Timeframe

  8. The LHC environment 1034 cm-2 s-1

  9. The SLHC environment [7] [15] 1035 cm-2 s-1 20x more interactions per bunch crossing

  10. Detector Upgrade Issues [7] [15] • Radiation tolerance • Services • Material budget • Data rates • Triggering Solve and build in ~10 years!

  11. The CMS Trigger system Muon chambers 20x ? 109 Hz Level 1 105 Hz Tracker information à la HLT? HLT 102 Hz Tracker Inner Analysis Outer ECAL HCAL [7][16]

  12. “Stacked Tracking” High pT particle Low pT particle PASSES “Stacked” pixel layers 1-2mm FAILS J Jones, A Rose et al [17][18] (from interaction point)

  13. “Stacked Tracking” [16][18]

  14. Conclusions • SLHC needed • Describe new physics • Improve, extend • Many technical challenges • 20x more interactions pbx • e.g. level 1 triggering • R&D needed – now!

  15. Thanks to: • G Hall, A Nikitenko, A Rose • 1st year PGs • You – for listening • Any questions?

  16. References • [1] The LHC Study Group: The Large Hadron Collider: Conceptual Design, CERN/AC/95-05 (1995) • [2] Branson, J. G. et al: High transverse momentum physics at the Large Hadron Collider: The ATLAS and CMS Collaborations, Eur. Phys. J. direct C4, N1 (2002) • [3] Krasnikov, N. V. & Matveet, V. A: Search for new physics at LHC, Phys. Usp. 47, p643−670 (2004) • [4] CMS Collaboration: The Compact Muon Solenoid Technical Proposal, CERN LHCC/94-38, LHCC/P1 (1994) • [5] ATLAS Collaboration: ATLAS Technical Proposal, CERN LHCC/94-43 LHCC/P2 (1994) • [6] Scandale, W: LHC luminosity and energy upgrade, TUXPA03, Proc. European Particle Accelerator Conference ’06 Edinburgh (2006) • [7] CMS Collaboration: CMS Expression of Interest in the SLHC, CERN LHCC 2007-014, LHCC-G-131 (March 2007) • [8] Gianotti, F. et al: Physics Potential and Experimental Challenges of the LHC Luminosity Upgrade, Eur. Phys. J. C 39, p293−333 (2005) • [9] Glover, E. W. & van der Bij, J. J: Multi Higgs Boson Production via Gluon Fusion, CERN-TH-5022-88 (1988)

  17. References • [10] Plehn, T. et al: Pair production of neutral Higgs particles in gluon-gluon collisions, Nucl. Phys. B479, p46−64 (1996) • [11] Kanemura, S. et al: New physics effect on the Higgs self-coupling, Phys. Lett. B558, p157−164 (2003) • [12] Plehn, T. et al: Probing the Higgs self-coupling at hadron colliders using rare decays, Phys. Rev. D69, 053004 (2004) • [13] Blondel, A. et al: Studies on the measurement of the SM Higgs self-couplings, ATL-PHYS-2002-029 (2002) • [14] Castenier, C. et al: Higgs self coupling measurement in e+e− collisions at center-of-mass energy of 500 GeV, LC-PHSM-2000-061, hep-ex/0101028 (2001) • [15] Hall, G, private communication • [16] CMS Collaboration, CMS Data Acquisition Technical Design Report, CERN/LHCC/2002-26, CMS TDR 6.2 (2002) • [17] Jones, J. et al: A Pixel Detector for Level-1 Triggering at SLHC, Proc. LECC 2005 Workshop, CERN Report CERN-2005-011, p130−134 (2005) • [18] Jones, J. et al: Stacked Tracking for CMS at Super-LHC, Proc. LECC 2006Workshop, CERN-2007-001, p130−134 (2007)

  18. Backup Slides

  19. What are we looking for? • Origin of mass? • Higgs? • Supersymmetry? • GUTs? • Extra dimensions?

  20. The Compact Muon Solenoid (CMS) • Mass: 12500T • Cost: £250M • Time: ~15 years • 2000+ scientists • 155 institutes • 37 countries

  21. The CMS Trigger system Muon chambers ECAL Tracker Inner Outer HCAL

  22. SM Higgs decay mode branching ratios 1 10-1 Branching ratio 10-2 10-3 mH (GeV/c2) 100 300 200 400

  23. Extracting the Higgs Self-coupling [13]

  24. Extracting the Higgs Self-coupling [13]

  25. Extracting the Higgs Self-coupling ds/dmvis (fb/GeV) Plehn et. al. Phys Rev D67 033003 (2003) mvis (GeV)

  26. Traditional Tracking Silicon strips/pixels 5-10cm Reconstruct track from hits 5-10cm  pT

  27. How do we upgrade for the SLHC? • Handle 20x more interactions • Requires extensive R&D • e.g. triggering at CMS • This needs to start now/continue • Focus of my PhD • Data from current detector • L1 triggering with tracker info.

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