Presentation on theme: "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,"— Presentation transcript:
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 Higgs self-coupling measurement? Upgrade challenges The CMS silicon tracker Tracker info in the level-1 Trigger? Questions at the end, please
The Large Hadron Collider
Why increase the luminosity? Statistics Increase data rate precision Physics motivation 1) Improve SM precision 2) Improve “new physics” precision 3) Extend discovery reach 4) Sensitivity to rare processes The question is: Where to look? 
Why increase the luminosity? e.g. Trilinear coupling precision: SLHC ( m H = GeV ): ~20% SLHC ( m H = 120GeV ): ~50-80% Linear Collider: ~20% (HH) ~10fb 
Why upgrade to the SLHC? LHC discoveries will need probing SLHC - increase precision & reach Present knowledge Current infrastructure Timeframe
The LHC environment cm -2 s -1
The SLHC environment cm -2 s -1 20x more interactions per bunch crossing  
Detector Upgrade Issues Radiation tolerance Services Material budget Data rates Triggering Solve and build in ~10 years!  
Analysis 10 2 Hz HLT 10 5 Hz Level Hz The CMS Trigger system Muon chambers ECALHCAL Tracker Inner Outer 20x? Tracker information à la HLT? 
“Stacked Tracking” 1-2mm (from interaction point) High p T particle Low p T particle “Stacked” pixel layers PASSES FAILS J Jones, A Rose et al 
“Stacked Tracking” 
Conclusions SLHC needed Describe new physics Improve, extend Many technical challenges 20x more interactions pbx e.g. level 1 triggering R&D needed – now!
Thanks to: G Hall, A Nikitenko, A Rose 1 st year PGs You – for listening Any questions?
References  The LHC Study Group: The Large Hadron Collider: Conceptual Design, CERN/AC/95-05 (1995)  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)  Krasnikov, N. V. & Matveet, V. A: Search for new physics at LHC, Phys. Usp. 47, p643−670 (2004)  CMS Collaboration: The Compact Muon Solenoid Technical Proposal, CERN LHCC/94-38, LHCC/P1 (1994)  ATLAS Collaboration: ATLAS Technical Proposal, CERN LHCC/94-43 LHCC/P2 (1994)  Scandale, W: LHC luminosity and energy upgrade, TUXPA03, Proc. European Particle Accelerator Conference ’06 Edinburgh (2006)  CMS Collaboration: CMS Expression of Interest in the SLHC, CERN LHCC , LHCC-G-131 (March 2007)  Gianotti, F. et al: Physics Potential and Experimental Challenges of the LHC Luminosity Upgrade, Eur. Phys. J. C 39, p293−333 (2005)  Glover, E. W. & van der Bij, J. J: Multi Higgs Boson Production via Gluon Fusion, CERN-TH (1988)
References  Plehn, T. et al: Pair production of neutral Higgs particles in gluon-gluon collisions, Nucl. Phys. B479, p46−64 (1996)  Kanemura, S. et al: New physics effect on the Higgs self-coupling, Phys. Lett. B558, p157−164 (2003)  Plehn, T. et al: Probing the Higgs self-coupling at hadron colliders using rare decays, Phys. Rev. D69, (2004)  Blondel, A. et al: Studies on the measurement of the SM Higgs self-couplings, ATL-PHYS (2002)  Castenier, C. et al: Higgs self coupling measurement in e+e− collisions at center-of-mass energy of 500 GeV, LC-PHSM , hep-ex/ (2001)  Hall, G, private communication  CMS Collaboration, CMS Data Acquisition Technical Design Report, CERN/LHCC/ , CMS TDR 6.2 (2002)  Jones, J. et al: A Pixel Detector for Level-1 Triggering at SLHC, Proc. LECC 2005 Workshop, CERN Report CERN , p130−134 (2005)  Jones, J. et al: Stacked Tracking for CMS at Super-LHC, Proc. LECC 2006Workshop, CERN , p130−134 (2007)
What are we looking for? Origin of mass? Higgs? Supersymmetry? GUTs? Extra dimensions?
The Compact Muon Solenoid (CMS) Mass: 12500T Cost: £250M Time: ~15 years scientists 155 institutes 37 countries
The CMS Trigger system Muon chambers ECAL HCAL Tracker Inner Outer
SM Higgs decay mode branching ratios Branching ratio m H (GeV/c2)
Extracting the Higgs Self-coupling 
Extracting the Higgs Self-coupling 
Extracting the Higgs Self-coupling Plehn et. al. Phys Rev D (2003) d /dm vis (fb/GeV) m vis (GeV)
Traditional Tracking 5-10cm Reconstruct track from hits Silicon strips/pixels pT pT
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.