Compact Linear Collider CLIC Mila Pandurovi Vina Institute

Compact Linear Collider CLIC Mila Pandurović Vinča Institute of Nuclear Sciences on behalf of CLICdp Collaboration Mila Pandurovic Compact linear collider CLIC 4 th ICPPA, Moscow, 22 -26 Oct

Introduction • Mila Pandurovic Compact linear collider CLIC 4 th ICPPA, Moscow, 22 -26 Oct 2

Overview • Accelerator • Detector • Physics case • Higgs boson physics • Top quark physics • Beyond Standard model physics • Summary Mila Pandurovic Compact linear collider CLIC 4 th ICPPA, Moscow, 22 -26 Oct 3

Accelerator Novel ‘Two-beam technique’ CLIC uses new principle for power supply for the particle acceleration Drive beam (100 A/ 2. 4 Ge. V 240 Me. V) – klystron acceleration • Deceleration / power extraction / conversion high frequency RF acceleration main beam Main beam (1. 7 A / 9 Ge. V 1. 5 Te. V) 3 Te. V layout • • Cavities operated at room temperature accelerating gradient 380 Ge. V 1. 5 Te. V, 3 Te. V 72 MV/m 72/100 MV/m Demonstrated at CERN, CLIC CTF 3 test facility

Beam parameter optimization High precision of the measurement high luminosity At linear colliders high bunch charge N, small transverse beam sizes • High bunch population induces high E field • Deflection of particles radiation of beamstrahlung • Significant losses of energy • Distortion of luminosity spectrum Beamstrahlung γ Incoherent e+e- pairs γ γ hadrons Coherent e+e- pairs Trident e+e- pairs Energy stage 380 Ge. V 1. 5 Te. V 3. 0 Te. V Luminosity [ 1034 cm-2 s-1] 1. 5 3. 7 5. 9 Beam size at IP x / y [nm] ~150/2. 9 ~60/1. 5 ~40/1. 0 using ‘flat beams’ Mila Pandurovic Compact linear collider CLIC 4 th ICPPA, Moscow, 22 -26 Oct 5

New optimized CLIC Detector concept CLICdp-Note-2017 -001 CLIC detector is optimized for 3 Te. V stage Mila Pandurovic Compact linear collider CLIC 4 th ICPPA, Moscow, 22 -26 Oct 6

Physics program at CLIC • 380 Ge. V • Higgs physics • Top –quark physics • Top threshold scan ~345 Ge. V (100 fb-1) • 1. 5 Te. V • Beyond Standard Model (BSM) • Higgs physics: rare processes, self-coupling, tt. H • Boosted top physics • 3. 0 Te. V : statistics boost • Beyond Standard Model (BSM) • Higgs physics: rare processes • Boosed top physics Mila Pandurovic Compact linear collider CLIC 4 th ICPPA, Moscow, 22 -26 Oct 7

Higgs physics at CLIC • Higgsstrahlung ee – Recoil mass method: • model independent measurement of the mass and absolute couplings g. HZZ (leptonic channel)/ nearly model independent (hadronic) • limits on invisible Higgs decays BR(H inv) <0. 69% @ CL 90% • unique to the lepton colliders Mila Pandurovic Compact linear collider CLIC 4 th ICPPA, Moscow, 22 -26 Oct 8

Higgs couplings Model dependent Model independent Eur. Physics J. C 77, 475 (2017) Mila Pandurovic Compact linear collider CLIC 9 4 th ICPPA, Moscow, 22 -26 Oct 9

Top quark mass Threshold scan Direct reconstruction • Top quark production around the production threshold sensitive to mt and (yt, t, S) • the scan around the mt – 10 x 100 fb-1 Total uncertainty ~ 50 Me. V Statistical uncertainty 40 Me. V Systematic uncertainties dominant Radiative events Top quark width e+ e- → tt + ISR • Measurement of ISR Yukawa coupling Mila Pandurovic total uncertainty 150 Me. V Compact linear collider CLIC 4 th ICPPA, Moscow, 22 -26 Oct 10

Top physics highlights Top quark EW couplings Rare top quark decays • BSM models would modify tt. Z/ vertex • • Cross-section • Asymmetry measurement AFB CP conserving Mila Pandurovic CP violating Compact linear collider CLIC 4 th ICPPA, Moscow, 22 -26 Oct

Beyond Standard Model Physics (BSM) • Direct observation of new particles coupled to the electroweak bosons • Measurement of heavy SUSY superpartners • Available up to the kinematic limit for pair production m s/2 • Full simulation studies – precise measurements of mass and couplings to a percent level • Indirect observations • Deviations of Standard Model observables can point to the BSM • Accessible scales at CLIC up to the several tens of Te. V • Comprehensive report on the CLIC potential for BSM studies preparation Mila Pandurovic Compact linear collider CLIC in 4 th ICPPA, Moscow, 22 -26 Oct 12

Summary • CLIC is the proposed e+e- collider • Energy staged machine: energy span 380 Ge. V- 3 Te. V • Stages adaptable to possible physics discoveries • Well established physics program : Higgs, top and indirect BSM searches • High precision measurements of the Higgs boson and the top quark properties >> HL LHC • Beyond standard model studies: • Direct observations - high mass reach < 1. 5 Te. V • Indirect reach up to several tens of Te. V • Current focus European strategy update Mila Pandurovic Compact linear collider CLIC 4 th ICPPA, Moscow, 22 -26 Oct 13

THANK YOU Mila Pandurovic Compact linear collider CLIC 4 th ICPPA, Moscow, 22 -26 Oct 14

Mila Pandurovic Compact linear collider CLIC 4 th ICPPA, Moscow, 22 -26 Oct 15

Cost estimation Mila Pandurovic Compact linear collider CLIC 4 th ICPPA, Moscow, 22 -26 Oct 16

Linear collider challenges • High energy 350 Ge. V – 3 Te. V • high accelerator gradients (100 MV/m) • great number of accelerating cavities • High luminosity Cep. C (2 IPs) • At linear colliders luminosity is boosted by high beam collimation/focusing (nm transverse bunch size) • High bunch population • Beam passes only once ! Mila Pandurovic Compact linear collider CLIC 4 th ICPPA, Moscow, 22 -26 Oct 17