Common Benchmarks forFCC Physics

John Ellis

King’s College London & CERN

@ FCC-ee/TLEP7 Workshop

Overall coordination: JE, Christophe Grojean– Match theory predictions to FCC-ee experimental precisions

– How to discover new physics in precision measurements,

in rare decays (Z, W, t, H, b, c, t, …), in rare or invisible processes

– Set up the framework for global fits and understand the complementarity with other colliders (LHC, FCC-hh, in particular)

Model Building and New Physics

Andreas Weiler

Precision EW calculations

Sven Heinemeyer

Global Analysis, Combination, Complementarity

JE

QCD and gg Physics

(Joint exp/th)Peter Skands

Flavour Physics(Joint exp/th)

Jernej Kamenik

Synergy with FCC-hh physics

Linear collider physics,LEP physicsHF physics

Phenomenological Working Groups

Towards Benchmarks for FCC Studies

• Higgs physics:– precision studies– higher-dimensional operators,

composite Higgs– rare and exotic decays– multiple Higgs production– extra Higgs bosons

•  EW/SM precision issues– parameter measurements (mt, mW)

– higher-order EW corrections– 3 and 4 gauge boson (anomalous)

couplings– top (anomalous) couplings

• New physics related to EWSB:– WW scattering– supersymmetry– extra dimensions– composite models

• Rare flavour-changing processes:– Rare H decays– Rare Z decays– Rare top decays– charm/bottom flavor studies– lepton-flavour violation

• Extensions of the SM:– extra vector-like fermions– SU(2)R models

– leptoquarks

• Interface with cosmology:– dark matter– baryogenesis– right-handed/(almost) sterile

neutrinos

• QCD:– Perturbation theory– Modelling final states

Proposed physics topics to be used in the study of

synergy/complementarity among experiments at FCC-hh/ee/eh

Alain, Patrick, Michelamneglo, John + …?

LHC

HL-LHC

FCC-ee

FCC-hh (eh)

The Twin Frontiers of FCC-ee Physics

Precision Measurements • Springboard for

sensitivity to new physics

• Precision H studies• Precision Z studies• Theoretical issues:

– Higher-order QCD– Higher-order EW– Mixed QCD + EW

Rare Decays• Direct searches for new

physics• Many opportunities• Z: 1012

• b, c, τ: 1011

• W: 108

• H: 106

• t: 106

Precision FCC-ee Measurements

Precision Higgs Precision Electroweak

Possible FCC-ee Precision Measurements

What else is there?

Supersymmetry• Successful prediction for Higgs mass

– Should be < 130 GeV in simple models

• Successful predictions for couplings– Should be within few % of SM values

• Naturalness, GUTs, string, … (???)

p-value of simple models ~ 5% (also SM)

2012 20/fb

Scan of CMSSM

Buchmueller, JE et al: arXiv:1312.5250

Confronted with likelihood analysis of CMSSM

LHC Reach for CMSSM Susy

O. Buchmueller, JE, K. de Vries et al.

H to WW constraint on (m0, m1/2) plane in CMSSM:All points within one current σ of low-mass best-fit value

Impact of LHC Precision H on CMSSM

H to WW

O. Buchmueller, JE, K. de Vries et al.

H to WW constraint on (m0, m1/2) plane in CMSSM:Points within one, two, three TLEP σ of low-mass best-fit value

Impact of FCC-ee Precision H on CMSSM

H to WW

O. Buchmueller, JE, K. de Vries et al.

Estimate of (m0, m1/2) in CMSSM on basis ofprecision H measurements with low-mass best-fit central values

O. Buchmueller, JE, K. de Vries et al.

Impact of FCC-ee Precision H on CMSSM

ΓZ constraint on (m0, m1/2) plane in CMSSM:All points within one current σ of low-mass best-fit value

Impact of LEP Precision Z on CMSSM

ΓZ

O. Buchmueller, JE, K. de Vries et al.

ΓZ constraint on (m0, m1/2) plane in CMSSM:Points within one, two, three TLEP σ of low-mass best-fit value

Impact of FCC-ee Precision Z on CMSSM

ΓZ

O. Buchmueller, JE, K. de Vries et al.

Estimate of (m0, m1/2) in CMSSM on basis ofprecision Z measurements with low-mass best-fit central values

Impact of FCC-ee Precision Z on CMSSM

O. Buchmueller, JE, K. de Vries et al.

One-dimensional likelihood functions in CMSSM ifprecision measurements with low-mass best-fit central values:

compare masses with LHC measurements,

Test SUSY at the loop level

Impact of FCC-ee Precision on CMSSM

O. Buchmueller, JE, K. de Vries et al.

Comparison with LHC Measurement

• Consider squark and gluino pair production at low-mass best-fit point

• Simulate with PYTHIA + DELPHES

• Estimate 5 to 15% jet energy resolution• Assume 300/fb @ LHC @ 13 TeV• Fit data with template: estimated mass

resolution ~ 10 to 15%• Overall mass uncertainty ~ 20%• Test SUSY at the loop level

O. Buchmueller, JE, J. Marrouche et al.

Assume no SUSY @ HL-LHC:current precision measurements with high-mass best-fit values

Impact of HL-LHC on CMSSM

O. Buchmueller, JE, K. de Vries et al.

One-dimensional likelihood functions in CMSSM ifprecision measurements with high-mass best-fit central values:

Predict masses for FCC-pp measurements

Impact of FCC-ee Precision on CMSSM

O. Buchmueller, JE, K. de Vries et al.

What Parts of High-Mass CMSSM Parameter Space are Allowed?

• Imposing dark matter density constraint

• Focus-point strip:– A0 ~ 0, large m0/m1/2

• Extends to m1/2 ~ 4 TeV

• Neutralino has Higgsino mixture

• Truncated by mh

O. Buchmueller, JE, K. Olive et al.

Towards a ‘no-lose’ theorem for FCC-hh

HE-LHC

LHC 3000

LHC 300

LHC 8 TeV

• Imposing dark matter density constraint

• Stop coannihilation strip– A0 ~ 3 m0, large m0/m1/2

• Extends to m1/2 ~ 13 TeV

• Very small mass difference: mstop – mχ

• mh very uncertain

What Parts of High-Mass CMSSM Parameter Space are Allowed?

HE-LHC

LHC 3000

LHC 300

LHC 8 TeVO. Buchmueller, JE, K. Olive et al.

Towards a ‘no-lose’ theorem for FCC-hh

• Limited range compatible with mh

• Current precision EWPO measurements insensitive

Exploring the Focus-Point Strip

O. Buchmueller, JE, K. Olive et al.

• Compatible with LHC measurement of mh

• May extend to mχ = mstop ~ 6500 GeV

Exploring the Stop Coannihilation Strip

Current limits

(monojets), MET

LHC 300 (monojets), MET

HE-LHC (monojets), MET

LHC 3000 (monojets), MET

100 TeV (monojets), MET

Towards Benchmarks for FCC Studies

• Higgs physics:– precision studies– higher-dimensional operators,

composite Higgs– rare and exotic decays– multiple Higgs production– extra Higgs bosons

•  EW/SM precision issues– parameter measurements (mt, mW)

– higher-order EW corrections– 3 and 4 gauge boson (anomalous)

couplings– top (anomalous) couplings

• New physics related to EWSB:– WW scattering– supersymmetry– extra dimensions– composite models

• Rare flavour-changing processes:– Rare H decays– Rare Z decays– Rare top decays– charm/bottom flavor studies– lepton-flavour violation

• Extensions of the SM:– extra vector-like fermions– SU(2)R models

– leptoquarks

• Interface with cosmology:– dark matter– baryogenesis– right-handed/(almost) sterile

neutrinos

• QCD:– Perturbation theory– Modelling final states

Proposed physics topics to be used in the study of

synergy/complementarity among experiments at FCC-hh/ee/eh

Alain, Patrick, Michelamneglo, John + …?