Physics Case for the SuperLHC LHCC John Ellis

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Physics Case for the Super-LHC LHCC John Ellis, May 7 th, 2008 De Roeck,

Physics Case for the Super-LHC LHCC John Ellis, May 7 th, 2008 De Roeck, JE, Gianotti: hep-ph/0112004 Gianotti et al: hep-ph/0204087 POFPA: Blondel, Camilleri, Ceccucci, JE, Lindroos, Mangano, Rolandi: hep-ph/0609102 Presentations by De Roeck, Gianotti, Mangano

x 10 Hypothetical LLHC Luminosity Evolution without SLHC Lx 2

x 10 Hypothetical LLHC Luminosity Evolution without SLHC Lx 2

Physics Context in 2011 - 2015 • New physics expected in Te. V energy

Physics Context in 2011 - 2015 • New physics expected in Te. V energy range – Higgs, supersymmetry, extra dimensions, …? • Initial LHC data should indicate what physics, and at which energy scale • Two possible scenarios: – New physics at a low energy scale • But perhaps more at higher energies (e. g. , supersymmetry) SLHC will probe in more detail – New physics threshold at higher energy scale SLHC only available tool

Possible Physics Scenarios in 2011 Higgs, new physics light or heavy? Disfavoured by electroweak?

Possible Physics Scenarios in 2011 Higgs, new physics light or heavy? Disfavoured by electroweak? Favoured Tevatron almost here by g -2?

Accelerator Context in 2011 - 2015 • ILC may be ready for approval, BUT:

Accelerator Context in 2011 - 2015 • ILC may be ready for approval, BUT: • CLIC feasibility may be demonstrated, BUT • Neither project may finished within another decade SLHC may be the only game in town for a long time!

Possible LHC Upgrade Options • Upgrade of Linac – More intense beam @ 160

Possible LHC Upgrade Options • Upgrade of Linac – More intense beam @ 160 Me. V • New LHC insertions: – Luminosity 2. 1034 cm-2 s-1 Planned within supplementary budget voted by Council • Superconducting Proton Linac – Low power or few MW @ few Ge. V? • Replace PS – By PS 2 @ 50 Ge. V? • New LHC insertions: – Luminosity 1035 cm-2 s-1 • Replace SPS – By SC machine @ 1 Te. V? ? ? R&D within supplementary budget voted by Council

Upgrade Scenarios Currently Favoured - Avoid problems with beam heating - Peak luminosity ~

Upgrade Scenarios Currently Favoured - Avoid problems with beam heating - Peak luminosity ~ 1035 cm-2 s-1

Outline of Physics Topics • Standard Model: – Multi-W, Z couplings – Rare top

Outline of Physics Topics • Standard Model: – Multi-W, Z couplings – Rare top decays • Higgs physics: – Light Higgs: measure couplings, rare decays, self-coupling – Heavy Higgs: discover! • New physics: – Supersymmetry: sensitivity to heavy sparticles – Z’ – compositeness

Gauge-Boson Couplings @ SLHC

Gauge-Boson Couplings @ SLHC

Multiple W/Z Boson Couplings Accuracies for triple couplings Multi-boson final states

Multiple W/Z Boson Couplings Accuracies for triple couplings Multi-boson final states

Sensitivity to Rare Top decays • Flavour-changing decays very suppressed in the Standard Model

Sensitivity to Rare Top decays • Flavour-changing decays very suppressed in the Standard Model • Window on physics beyond the Standard Model

Measurements of Higgs Couplings • Some decays limited by statistics • Others limited by

Measurements of Higgs Couplings • Some decays limited by statistics • Others limited by systematics

Sensitivity to Rare Higgs Decays

Sensitivity to Rare Higgs Decays

Higgs Self-Coupling @ SLHC? Measure triple-Higgs-boson coupling with accuracy comparable to 0. 5 Te.

Higgs Self-Coupling @ SLHC? Measure triple-Higgs-boson coupling with accuracy comparable to 0. 5 Te. V ILC? Awaits confirmation by detailed experimental simulation

Higgs Measurements @ LHC & ILC For Mh = 140 Ge. V For Mh

Higgs Measurements @ LHC & ILC For Mh = 140 Ge. V For Mh = 120 Ge. V

Heavy Higgs @ SLHC

Heavy Higgs @ SLHC

Possible Resonance in WZ Channel • -like vector meson in chiral Lagrangian model •

Possible Resonance in WZ Channel • -like vector meson in chiral Lagrangian model • Invisible with 300 fb-1, clear with 3000 fb-1

Longitudinal W+W+ Scattering • Search for high-mass Higgs boson • Or whatever replaces it

Longitudinal W+W+ Scattering • Search for high-mass Higgs boson • Or whatever replaces it How important are detectors in forward region?

Search for Supersymmetry

Search for Supersymmetry

Exploring the SUSY Parameter Space • Most of region allowed by accelerators, cold dark

Exploring the SUSY Parameter Space • Most of region allowed by accelerators, cold dark matter can be explored by LHC • Some benchmark points difficult/impossible

Reach for Supersymmetry M 1/2 • LHC reaches squarks, gluinos ~ 2. 5 Te.

Reach for Supersymmetry M 1/2 • LHC reaches squarks, gluinos ~ 2. 5 Te. V • Does not cover all dark matter region • SLHC could reach squarks, gluinos ~ 3. 0 Te. V M K F

High-Mass SUSY @ SLHC • Preliminary studies of LHC-unfriendly point • Detectable @ SLHC

High-Mass SUSY @ SLHC • Preliminary studies of LHC-unfriendly point • Detectable @ SLHC

Exploring the SUSY Parameter Space • Most of region allowed by accelerators, cold dark

Exploring the SUSY Parameter Space • Most of region allowed by accelerators, cold dark matter can be explored by LHC • Some benchmark points detectable @SLHC

Implications of LHC Search for LCs In CMSSM LHC gluino mass reach SLHC reach

Implications of LHC Search for LCs In CMSSM LHC gluino mass reach SLHC reach ~ CLIC Corresponding sparticle thresholds @ LC LHC will tell ILC where to look ‘month’ @ 1032 ‘month’ @ 1033 1 ‘year’ @ 1034 Blaising, JE et al: 2006

Search for MSSM Higgses @ SLHC ILC @ 0. 5, 1 Te. V LHC

Search for MSSM Higgses @ SLHC ILC @ 0. 5, 1 Te. V LHC SLHC vs vs ILC 0. 5 ILC 1. 0 5 - discovery 95% exclusion

Sensitivity to a Heavy Z’ Boson

Sensitivity to a Heavy Z’ Boson

Sensitivity to Compositeness @ SLHC

Sensitivity to Compositeness @ SLHC

Pile-up at Different Luminosities

Pile-up at Different Luminosities

Detector Issues for the SLHC High radiation in central tracker Congested layout in forward

Detector Issues for the SLHC High radiation in central tracker Congested layout in forward direction: space for new low-β* machine elements?

General SLHC Detector Issues

General SLHC Detector Issues

SLHC Physics Reach Compared

SLHC Physics Reach Compared

Dreaming is Compulsory

Dreaming is Compulsory

Conclusions • The ‘expected’ – Higgs - but where? – Study in detail for

Conclusions • The ‘expected’ – Higgs - but where? – Study in detail for more clues • The ‘expected unexpected’ – Supersymmetry/extra dimensions – Unravelling it will need more data • The ‘unexpected’ – ? ? ? • Any new physics at the Te. V scale will also motivate next step in B physics: – ‘Super-LHCb’