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CMS Upgrade plans and Micromegas

CMS Upgrade plans and Micromegas. Theodoros Geralis Institute of Nuclear and Particle Physics NCSR Demokritos , Athens. Future Physics plans Detector requirement Detector longevity and Radiation damage. A high eta tracker in CMS HCAL end cap Upgrade Micromegas Technology

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CMS Upgrade plans and Micromegas

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  1. CMS Upgrade plans and Micromegas TheodorosGeralis Institute of Nuclear and Particle Physics NCSR Demokritos, Athens • Future Physics plans • Detector requirement • Detector longevity • and Radiation damage • A high eta tracker in CMS • HCAL end cap Upgrade • Micromegas Technology • and R&D studies for sLHC • Prospects 3rd Annual INPP Meeting, 17 June 2013 Theo Geralis

  2. Theo Geralis

  3. The Vector Boson fusion/scattering at LHC • - scattering can be resonant or not; • if non-resonant best channel is WL+WL+l+nl+n but just an excess of events • -resonant models are much more appealing! Event selection • Requires: Forward jet tagging and central jet vetoing! • BUT: at HLHC/SLHC forward jet tagging and central jet vetoing suffer from • big pile up, but calo method nonetheless applicable! Forward tracking would help much! • SLHC (3000 fb-1) a ~7s excess expected in W+W-scattering from • a strong coupling model (1TeV Higgs) over SM bkgd; Theo Geralis

  4. VBFNLO generator level studies on WW scattering George Anagnostou, Theo Geralis Institute of Nuclear and Particle Physics, NCSR Demokritos, Athens • The VBFNLO generator • WW scattering – jjeν μν final states • Basic kinematics distributions • Efficiencies vsη coverage • Production of 100 k Events/channel for the official CMS production CMS Pledges: 3 months  G. Anagnostou 3 months  T. Geralis Presentation in Future Analysis meeting, 23 May 2013 Theo Geralis

  5. Results included in Chris Hill plenary talk in last CMS Upgrade week in DESY Theo Geralis

  6. WW, ZZ and WZ cross sections Jet, VBF and charged lepton cuts Leptons fall inside rapidity gap * Total cross section summed for all lepton combinations Theo Geralis

  7. The CMS (Compact Muon Solenoid) detector Experimental conditions at 2x1034 cm-2 s-1 (25nsec) - SLHC/HLHC ~ 40 - 50 pile-up events per bunch crossing ≈ 1250 tracks in tracker acceptance per crossing 2011:pile-up for L~3.3x1033cm-2s-1 A new tracker has to be installed in the high eta region 7 Identify the interaction point with Δz~1 mm precision Tracker in2.5<|η|<5 Theo Geralis

  8. FWD tracking detector requirements • Cover to the largest extend η : 2.5 < |η| < 4.0 • Precision tracking for z-vertex determination: ~1mm • Sustain high charged track rates: up to ~ 107 cm-2 s-1 • Operate at a presence of high neutron fluxes: • ~ 107 cm-2 s-1 • Tolerate long term exposure to radiation • Long term gain stability • Affordable to manufacture Theo Geralis

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  10. One tentative detector layout Outer Radius • Micromegas characteristics • Strips: 150 μm • Pitch: 250 μm • Strip length 10 cm • Drift gap 5 mm Inner Radius For both sides (2.5 < |η|<4.9 ) ~70 m2 active area Supposing 10x10 cm2 active areas i.e. 10 cm long strips: ~3 000 000 Channels In outer regions with lower Occupancy we may have Longer strips No optimization yet Single track z-resolution at IP Expect to perform better with jets Theo Geralis

  11. Τentative detector layout HF IF SILICON PIXEL DETECTOR CAN TOLERATE THE RADIATION AT THIS REGION OF CMS AT HL-LHC THEY ARE MORE PREFERABLE AS AN ADIABATIC EXPANSION OF THE CURRENT TRACKER Theo Geralis

  12. Hadron Calorimeter End Cap detector degrades much faster than predicted: Estimated to last for 500 fb-1 and has lost 30% of the signal with 5% of the Luminosity It may need to be replaced by other active elements: Glass RPCs, GEM, Micromegas Theo Geralis

  13. Theo Geralis

  14. 3 Micromegas built at INPP to study for the sLHC environment Theo Geralis

  15. Prospects - Plans • Micromegas can be an option for a FWD tracker at CMS • if Si sensors cannot tolerate the radiation level at high η. • Future Physics studies have been initiated at INPP for • the CMS Phase II upgrade. Vector boson scattering is a • sensitive probe to new Physics beyond the SM scale • Micromegas is one of the three option for the Hadronic • Calorimeter (End CAP) – the other two being GEM and GRPC Theo Geralis

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