Bedeschi Roma3 Jan2020 split - Agenda (Indico)Microsoft PowerPoint - Bedeschi_Roma3_Jan2020_split...

The FCC Option

F. Bedeschi, INFN

Roma3, January 29, 2020

Very brief motivations

FCCeeMachine and physics

FCChhMachine and physics

Schedule and costs

Final comments

Outline

Roma3, January 29, 2020

Physics motivations

No (additional) signs of BSM physics.After intensive searches at LHC MNP > 1 TeV

Roma3, January 29, 2020 F. Bedeschi, INFN-Pisa2

Physics motivations

No (additional) signs of BSM physics.After intensive searches at LHC MNP > 1 TeV

Physics motivations

Higgs properties SM-like.

Physics motivations

Higgs properties SM-like.After HL-LHC precision level of several %

Granada 2019

Physics motivations

Deviation from SM: d ~ v2/M2 v = 246 GeVM scale of new physics

M ~ 1 – 10 TeV d ~ 6 – 0.06%

Physics motivations

Deviation from SM: d ~ v2/M2 v = 246 GeVM scale of new physics

M ~ 1 – 10 TeV d ~ 6 – 0.06%

Need < ~ % sensitivity beyond HL-LHC

Current physics landscape

No (additional) signs of BSM physics.After intensive searches at LHC

Higgs properties SM-like.At current precision level of several %

… but SM is an insufficient description

Current physics landscape

No (additional) signs of BSM physics.After intensive searches at LHC

Higgs properties SM-like.At current precision level of several %

… but SM is an insufficient descriptionPrevalence of matter over anti-matter.

Not explained by current values of CKM elements

Neutrinos have masses – not acquired in the SM.

Compelling evidence for the existence of dark matter in the Universe with no candidate particle(s) in the SM.

What new machine in this scenario?

Current directions

ICFA statement - Tokyo, March 2019: “ICFA confirms the international consensus that the highest priority for the next global

machine is a “Higgs Factory” capable of precision studies of the Higgs boson. ……………………………………………………………… ICFA notes with satisfaction the great progress of the various options for Higgs factories proposed across the world. All options will be considered in the European Strategy for Particle Physics Update and by ICFA.

ICFA report – LP2019, Toronto, August 2019: Worldwide effort for e+e- Higgs Factory must not fail!

Linear or Circular

Asia or Europe (or elsewhere?)

Recent comments on ESPPU preparations (B. Vachon – LP2019) Emerging consensus for the importance of a “Higgs factory” to fully

explore properties of the Higgs, EW sector, etc.

Need to prepare a clear path towards highest energy.Roma3, January 29, 2020 F. Bedeschi, INFN-Pisa5

The FCC integrated program

FCC integrated program can respond to these requests in an optimal way

Comprehensive program to optimize physics opportunities

Comprehensive program to optimize physics opportunitiesStage 1: FCC-ee (Z, W, H, tt)

Higgs factory, EW and top factory at highest luminosities.

Comprehensive program to optimize physics opportunitiesStage 1: FCC-ee (Z, W, H, tt)

Higgs factory, EW and top factory at highest luminosities.

Stage 2: FCC-hh (~100 TeV) Natural continuation at energy frontier, with ion and eh options.

Complementary physics

Common civil engineering and technical infrastructures

Integrating an ambitious high-field magnet R&D program

FCC e+e-

FCC-ee

Double ring e+e- collider ~ 100 kmRF power limited to 50 MW/beam

2 IP currently - 4 IP possible

FCC-ee

Double ring e+e- collider ~ 100 kmRF power limited to 50 MW/beam

2 IP currently - 4 IP possible

Booster ring for top up injection

FCCee parameters

SR power 50 MW/beam

Total site power <300 MW

Luminosity comparisons

1 TeV 3 TeV100 GeV

100 x LEP2

Physics at FCC-ee

Higgs factory106 e+e- → HZ

Physics at FCC-ee

EW & Top factory5x1012 e+e- → Z

108 e+e- → W+W- ;

106 e+e- → tt

Physics at FCC-ee

108 e+e- → W+W- ;

106 e+e- → tt

Flavor factory1012 e+e- → bb, cc

1011 e+e- → + -

Physics at FCC-ee

108 e+e- → W+W- ;

106 e+e- → tt

Flavor factory1012 e+e- → bb, cc

1011 e+e- → + -

Potential discovery of NPALPs, RH ν’s, …

Higgs production

pp @ LHC

Very clean production

in e+e-

Higgs total width

Higgs recoil provides model independent measurement of coupling to Zs(HZ) g2

L = 5 ab-1

Higgs total width

Critical:Beam energy spread: SR+BS

L = 5 ab-1

Higgs total width

Critical:Beam energy spread: SR+BS

Total width combining with

decays in specific channels

L = 5 ab-1

Higgs coupling fits

Results limited only by statistics

Higgs coupling fits

Results limited only by statistics

Triple Higgs

No direct production @ FCC-eeSensitivity through loop effects

Triple Higgs

dkl update 2020 FCChh

2.0(stat) + 2.5-4.0(syst) %

Outstanding program of precision EWK measurementsO(10-100) better than LEP precision

Substantially reduce parametric uncertainties in theory

EWK examples

W mass/width 0.5/1.2 MeV resolutionWW threshold scan/ direct measurements check and improve

Top quark mass/width 17/45 MeV resolution tt threshold scan – N3LO, ISR and FCCee luminosity spectrum

EWK examples

W mass/width 0.5/1.2 MeV resolutionWW threshold scan/ direct measurements check and improve

Top quark mass/width 17/45 MeV resolution tt threshold scan – N3LO, ISR and FCCee luminosity spectrum

S, T parameters (Peskin–Takeuchi)

Comparison of Higgs factories

NP sensitivity from EFT fits

From exclusive fits Reach to several 10’s TeV

EWK observables

Higgs observables

NP sensitivity from EFT fits

From exclusive fits Reach to several 10’s TeV

Theory uncertaintiesParametric~ exp. precision

Theory precision need3 loop Z pole

2 loop WW

EWK observables

Higgs observables

Heavy flavors

Large heavy flavor production at Z pole

Very clean, well separated, pairs

Heavy flavors

Large heavy flavor production at Z pole

Very clean, well separated, pairs

Example:Lepton universality

in B0 → K*0 τ+τ-

Direct NP search example: HNL

HNL mix with active neutrino’sFully reconstructable decay with W

Small mixing long lifetime

10 cm < ct < 100 cm

1012 Z

10 cm < ct < 100 cm

1012 Z

0.01 cm < ct < 500 cm

1013 Z

FCChh parameters

Total site power <600 MW

FCChh key facts

LHC technology

8.3 T NbTiHL-LHC technology

11 T Nb3Sn

16 T Nb3Sn

O(x10) E and L100 TeV

20 ab-1/exp.In 25 years

Key tech. issue:High field magnets

20 T with HTS

FCChh magnets

Exploration potential

Search reach scaled from HL-LHC (2-3 TeV for SUSY)

McCullough, FCC meeting

Rome, 2016

Dark matter

Dark matter (simplified models)100 TeV pp could cover all parameter space allowed by

cosmological bounds

M. McCullough, FCC week 2016

FCC-ee + FCC-hh schedule

FCC costs

Total cost FCCee: 10,600 MCHFAddition for tt 1,100 MCHF

Total additional cost for FCChh: 17,000 MCHFStand alone ~25 BCHF

ESG main scenarios

5 basic options for the future being explored by ESG

CERN funding:First 3 scenarios: 10-13% CERN budget in 2025-2045

Civil engineering assumed outside of CERN budget

4th scenario: ~20% CERN budget in 2025-2045

5th scenario is within the regular CERN budget

Last 2 scenarios assume that an e+e- collider is built outside of Europe

Schedule comparisons

U. Bassler

Final comments

Major physics potential at FCC-eeStudy Higgs x10 better than HL-LHC

EWPO x10-100 better than LEP

HF studies complementary to LHC-b/Belle II

Final comments

Matches right time scale immediately after HL-LHCGives time for high field magnet development

Final comments

Major physics and exploration potential at FCC-hhShares tunnel and much of the FCCee infrastructure

HHH to 5% precision

Huge jump in direct discovery potential

Final comments

Major physics and exploration potential at FCC-hhShares tunnel and much of the FCCee infrastructure

HHH to 5% precision

Huge jump in direct discovery potential

Great vision and plan for the next 70 years of HEPRoma3, January 29, 2020 F. Bedeschi, INFN-Pisa32

Bedeschi Roma3 Jan2020 split - Agenda (Indico)Microsoft PowerPoint - Bedeschi_Roma3_Jan2020_split...

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