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Highlights of the FCC Project at the BaBar Meeting - SLAC 11/12/2018

Delve into the Future Circular Collider (FCC) Study and exploration of Flavor Physics reaches at the BaBar meeting at SLAC on 11/12/2018. Discover international collaboration, luminosity objectives, precision measurements, and more.

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Highlights of the FCC Project at the BaBar Meeting - SLAC 11/12/2018

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  1. The FCC (ee-hh) project Roy Aleksan CEA BaBar meeting SLAC 11/12/2018 BaBar 25th Anniversary • Introduction FCC • SelectedFlavorPhysicsreaches of FCCee and hh* • Conclusion * Only a tiny part of physics program discussedhere Detector issues not discussed in this talk

  2. Future Circular Collider (FCC) Study • International FCC collaboration (CERN as host lab) to study: • pp-collider (FCC-hh)  long term goal, defining infrastructure requirements • ~100 km tunnel infrastructure in Geneva area, site specific • e+e-collider (FCC-ee), as potential first step • HE-LHC with FCC-hhtechnology • p-e(FCC-he) option, IP integration, e- from ERL HE-LHC ~16 T  100 TeVpp in 100 km CDR in fall 2018

  3. FCC-ee collider parameters FCC-eeLuminosity for 50 MW power per beam and 2 IP ~2x1012Z/y (a EWK, flavor, lepton… physics) ~2x107 W/y ~3x105 H/y ~4x105 t/y

  4. FCC Luminosity objectives : 150ab (FCCee @ Zpole), 30ab (FCChh @ 100TeV) FCChh FCChh: s(b)~1mb FCCee: s(b)~6nb s(t)~1.2nb LHC: s(b)~0.15mb Z-pole FCCee: ~1.8 1012 b /IP (x18 belle2) FCCee: ~0.4 1012t/IP (x5 belle2) FCChh: ~6 1016 b/IP (h<5, PT>5 GeV)

  5. More specifically for hb production

  6. B Physics show evidence for lepton universality violation >1O7eventsproduced @FCCee unique opprotunity at FCCee: >1O5eventsproduced at FCCee: >1O3reconstructedevents (3-prongs t)

  7. Examples of otherinteresting non-B physics Search for (PDG : <10-5) Main background () • Limitation are : • dp/p • dEBeam/EBeam

  8. Search for right-handed Neutrino withdisplaced vertex at FCCee

  9. FCC precisionmeasurements • (E calibration) • (E calibration+ stat.) (th. 40-50 MeV) + manyotherprecisionmeasurements: sin²qw, , R, Rb , AFB , ALR , Nn…. In tension for AbFB Precisionmeasurements as of to date Precisionmeasurements as expected at FCCee FCCee direct FCCee Z pole

  10. Conclusions • FCCee enables unequaled precision tests of the EW sector of the SM • (including the flavor sector) • Thanks to • Extremely high luminosities • Operation at the Z pole (mandatory) and WW threshold • Clean and well know initial condition (beam energy calibration, very small beamstralhung) • Well know accelerator technologies (being tested with KEKII) • FCChh enables unequaled reach for direct BSM physics as well as tests of the EW sector complementary to FCCee (including so specify Flavor Decays, i.e. B(s)-> mm) • Thanks to • Extremely high energy and luminosities • Excellent complementarity with FCCee (ttH and HHH couplings) • Accelerator technologies being tested at HL-LHC and at other infrastructures FCC would enable a fantastic opportunity for HEP over the next 60 years or so … a long way forward from BaBar

  11. First event simulation with GEANT (noted in mylogbook)

  12. Back up slides

  13. Higgs couplings only a part of FCCee program Beam E cal. with reson. depolar. Max sensit. to M Max sensit. to G As important is the precision on SM parameters : FCCee will improve precision by > 1 order of magnitude Running at Z pole mandatory, as is progress in theory

  14. Polarizationatcircularcolliders • e-(e+) spin naturally aligns opposite to dipole magnetic field (Sokolov-Ternoveffect) • Transverse polarization builds up by synchrotron radiation emission (or if needed using wigglers) : Observed at LEP • Transverse to longitudinal polarization is achieved with Spin Rotators RF-m B^ 10 % polarization in 90mn at the Z pole usingwigglers • Resonant depolarization is achieved with small field (perpendicular to dipole field) RF-magnet with frequency in phase with precession frequency/turn. (Precession period is proportional to beam energy) • Depolarizing RF-magnet frequency measures beam energy with <0.1 MeV

  15. Possible scenario for vs running time @ FCCee (88-365 GeV)

  16. FCC-eeoperation model total program duration: 14 years - including machine modifications phase 1 (Z, W, H): 8 years, phase 2 (top): 6 years

  17. FCC-ee RF staging scenario “Ampere-class” machine • threesets of RF cavities to cover all options for FCC-ee & booster: • high intensity (Z, FCC-hh): 400 MHz mono-cell cavities (4/cryom.) • higher energy (W, H, t):400 MHz four-cell cavities (4/cryomodule) • ttbarmachine complement: 800 MHz five-cell cavities (4/cryom.) • installation sequence comparable to LEP ( ≈ 30 CM/shutdown) RF system re-alignment and modifications “high-gradient” machine 26 26 19 74 10 26 21 42 20 100 3 machine booster time [operation years]

  18. Measuring sin²qweff from FB mm asymmetry • Strongenergydependence in Z pole vicinity • Excellent knowledge of E beam • Possible with RD a < 0.1 MeV • a 6 10-6 on sin²qweff(now1.6 10-4 direct and 7 10-5 EW fit seebelow) Parametricuncertainties in EW fit a Need to improbe aQED Possible by measuring the slope of AFBmmnear Z-pole (~-3 , ~+3 GeV) d(aQED) = 3 10-5 a parametric contribution 9 10-6

  19. Higgs self coupling @ FCCee (90-365 GeV) Single Higgs Xsection is sensitive to trilinear coupling dkl/kl =25-40%

  20. 12/11/2018

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