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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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slide1

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

outline of the talk
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

why increase the luminosity
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?

why increase the luminosity1
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

why upgrade to the slhc
Why upgrade to the SLHC?
  • LHC discoveries will need probing
  • SLHC - increase precision & reach
    • Present knowledge
    • Current infrastructure
    • Timeframe
the lhc environment
The LHC environment

1034 cm-2 s-1

the slhc environment
The SLHC environment

[7]

[15]

1035 cm-2 s-1

20x more interactions per bunch crossing

detector upgrade issues
Detector Upgrade Issues

[7]

[15]

  • Radiation tolerance
  • Services
  • Material budget
  • Data rates
  • Triggering

Solve and build in ~10 years!

the cms trigger system
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]

stacked tracking
“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)

conclusions
Conclusions
  • SLHC needed
    • Describe new physics
    • Improve, extend
  • Many technical challenges
    • 20x more interactions pbx
    • e.g. level 1 triggering
    • R&D needed – now!
slide15
Thanks to:
  • G Hall, A Nikitenko, A Rose
  • 1st year PGs
  • You – for listening
  • Any questions?
references
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)
references1
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)
what are we looking for
What are we looking for?
  • Origin of mass?
    • Higgs?
  • Supersymmetry?
  • GUTs?
  • Extra dimensions?
the compact muon solenoid cms
The Compact Muon Solenoid (CMS)
  • Mass: 12500T
  • Cost: £250M
  • Time: ~15 years
  • 2000+ scientists
  • 155 institutes
  • 37 countries
the cms trigger system1
The CMS Trigger system

Muon chambers

ECAL

Tracker

Inner

Outer

HCAL

sm higgs decay mode branching ratios
SM Higgs decay mode branching ratios

1

10-1

Branching ratio

10-2

10-3

mH (GeV/c2)

100

300

200

400

extracting the higgs self coupling2
Extracting the Higgs Self-coupling

ds/dmvis (fb/GeV)

Plehn et. al.

Phys Rev D67 033003 (2003)

mvis (GeV)

traditional tracking
Traditional Tracking

Silicon

strips/pixels

5-10cm

Reconstruct track from hits

5-10cm

 pT

how do we upgrade for the slhc
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.