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ATLAS

ATLAS/LHC Ultimate LHC →　 HL-LHC. LHC b. MoEDAL. ATLAS. LHCf. CMS. TOTEM. ALICE. Circumference: 26.7km Design Energy 7TeV+7TeV. Katsuo Tokushuku (KEK). ATLAS Collaboration. 38 Countries 173 Institutions ~ 2980 active scientists:

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ATLAS

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  1. ATLAS/LHC UltimateLHC→　HL-LHC LHCb MoEDAL ATLAS LHCf CMS TOTEM ALICE Circumference: 26.7km Design Energy 7TeV+7TeV KatsuoTokushuku (KEK)

  2. ATLAS Collaboration • 38 Countries • 173 Institutions • ~ 2980 active scientists: • ~ 1800 with a PhD  contribute to M&O share • ~ 1100 students KEK and other 15 Japanese universities ~110 scientists (including students) KEK: 25 members including 6 ph-D students (as of March13)

  3. ATLAS Collaboration • 38 Countries • 173 Institutions • ~ 2980 active scientists: • ~ 1800 with a PhD  contribute to M&O share • ~ 1100 students

  4. ATLAS: Japanese contribution to the ATLAS detector and its upgrade • Superconducting Central Solenoid (Japanese contribution:100%)(Yamamoto) • Time-to-digital conversion chips for muon drift tubes (100%) (Arai) • End-cap muon triggering system (TGC) (~50%) (Iwasaki, Sasaki, Tanaka) • -> New trigger logic system for LVL1 • Silicon microstrip tracking system (SCT) (~20%) (Unno, Ikegami) • -> New inner tracker with pixel and strip detectors • Tracking (||<2.5, B(solenoid)=2T): • -- Si pixels and strips • -- Transition Radiation Detector (e/ separation) • Calorimetry (||<5): • -- EM : Pb-LAr • -- HAD: Fe/scintillator (central), Cu/W-LAr (fwd) • Muon Spectrometer (||<2.7) : • air-core toroids with muon chambers Length : ~ 46 m Radius : ~ 12 m Weight : ~ 7000 tons ~ 108 electronic channels ~ 3000 km of cables

  5. ATLAS: KEK contribution to the ATLAS Operation • Detector: TGC contact: (Ishino:now at Kyoto U.), SCT DQ (Tojo) • Trigger: Muon and Tau signature coordinators (Nagano, Tsuno) • Reconstruction: Tau Convener (Tsuno) • Monte Carlo: Production Coordinator (Tojo : now at Kyushu U.) • Physics: Higgs -> tau tau(Nakamura, Tsuno), • Top cross section, W+charm, high-mass dimuon… • Management: An ATLAS executive board member. (Tokushuku)

  6. LHC-Run1 (2010-2012): Very successful years for LHC and ATLAS ! Many thanks to the LHC team for such a superb performance ! Integrated Luminosity 7TeV: 5.25fb-1 8TeV: 21.7 fb-1

  7. Discovery of a new particle (July/2012)

  8. Discovery of a new particle (July/2012)

  9. Discovery of a Higgs-like particle! July

  10. Discovery of a Higgs-like particle! November 2012 HCP in Kyoto

  11. March 2013 mH=125.5 ±0.1+0.5-0.6 GeV μ= 1.30 ±0.20

  12. No sign of the BSM (yet)

  13. No sign of the BSM (yet) Stop searches

  14. No sign of the BSM (yet) Dilepton resonance Zssm M>2.86TeV

  15. No sign of the BSM (yet)

  16. Run plan shutdown consolidation 14TeVrun shutdown 13-14TeVrun LHC UltimateLHC L=2x1034 NominalLHC L=1x1034 2023 2013 2024 2014 2015 2025 2016 2026 2027 2017 2018 2028 2029 2019 2020 2030 2031 2021 2032 2022 KEK-Roadmap ATLAS roadmap 1 ATLAS/LHC roadmap 2 We will continue the experiments with the nominal energy LHC, 1) to understand the property of the Higgs particle and 2) to search for new phenomena beyond the SM and others We will start a leading contribution in LHC/ATLAS upgrade: for example, LHC superconducting magnet / silicon tracker and muonsystem HL-LHC L=5x1034 leveling 3000fb-1in 10 years

  17. Why HL-LHC? • LHC will be the unique energy-frontier collider for the next ten years (or more). • Because of high radiation damage, LHC’s focusing magnets and ATLAS/CMS inner trackers will be dead after Int. Lumi. of 300-500fb-1 is accumulated. （which will happen in early 2020’s） • We need to replace them in order to perform physics with Int. Lumi 1000-3000fb-1. • Let’s aim for 3000fb-1 ! Luminosity leveling at 5x1034cm-2s-1. Can be feasible with crab crossing. Still, the number of collisions at a bunch crossin is >100. We need the better detector to work in the harsh environment. Inner triplet magnet designed and constructied by KEK and FNAL ATLAS Detector

  18. Physics at HL-LHC • Precise measurements of the Higgs particle: • Is this the only Higgs? • Any deviation from the SM Higgs properties? • If we find new particles in 13/14TeV run starting from 2015, • Study the properties of the particles. • If we don’t • We will continue the search for new phenomena up to the kinematical limit. Proton PDF 　　　　→　low flux of the high energy partons in the proton 　　　　→We need high integrated luminosity.

  19. Higgscouplings( very conservativeestimations） • κγ/κZ tested at 2% • ggloop (BSM) κt/κg at 7-12% • 2nd generation ferm. κμ/κZ at 8%

  20. Higgs measurements Raredecays with enormous statistics H→μμ ttH; H→γγ With an assumtion of UniversalKV、KF

  21. H→HHA very preliminary study Huge backgrounds from ttbar, ttH, etc. The most promising decay mode is HH→bbγγ With a simple cut-based Analysis λHHH=0-> 26 events λHHH=1-> 15 events @ IntL=3000fb-1 backgrounds24events 2σsignificance in one experiment.

  22. BSM HL-LHC reach • 3TeV squarks2.5TeV gluinos

  23. It’s not easy! L=5×1034~ 100pilups 2010 O(2) Pile-up events 2011 O(10) pileups LuminosityLeveling: 2012 O(20) pileups

  24. HL-LHC • LuminosityLeveling: various options • Crab crossing • β*leveling Replace the forcusing magnets around ATLASand CMS. And upgrades for LHC injectors.

  25. LHC Injector LHC SPS ATLAS PS booster PS RF Amplifiers: Possible KEK conributions LINAC4 （2018） Magnetic arroys in the RF cavity. (developed at J-PARC)

  26. Very fruitful collaboration with CERN J-PARCneutrino beamline LHCmagnets PSB: cavities J-PARCRF cavities

  27. International collaboration has started for the design work of the magnet system ～３００m Epoxy (G10) CE BT BMI D1: KEK Q1-3: US-LARP(Nb3Sn) or CERN(NbTi) D2: BNL Q4-6: CEA/Saclay JAEA Takasaki Cryogenic γ-ray irradiation Facility 27 Radiation test at J-PARC Challenges: Large aperture (φ130~150mm) 6 Tesla magnet: saturation, flux leakage High radiation dose: selections of rad-hard materials

  28. ATLAS upgrade (1) Inner tracker replacement Pixel A new inner tracker design Radiation hard trackers are already in reality! We need a huge investiment. Pixel8.2 m2 600M ch. Strip193 m2 70 M ch. Prototypes of the strip detector: produced by KEK and Geneva U. 10cm

  29. ATLAS upgrade (2)Trigger upgrade Middle MDT (BW) Outer MDT Inner MDT m New Muon Trigger with the drift tube readout. Large wheels equipped with the TGCs Upgrade of the small wheel CAL trigger upgrade (U. of Tokyo) Track trigger (Waseda University) 29

  30. Run plan shutdown consolidation 14TeVrun shutdown 13-14TeVrun LHC UltimateLHC L=2x1034 NominalLHC L=1x1034 2013 2023 2024 2014 2015 2025 2026 2016 2017 2027 2018 2028 2029 2019 2020 2030 2021 2031 2032 2022 Construction Installation Accelerators Injectors Installation Construction R&D Magnets Installation Collaboration Crab cavities ATLAS Installation R&D Detector upgrade Construction We need to start construction in 2015, in order to install them in 2022. HL-LHC L=5x1034 leveling 3000fb-1in 10 years

  31. Summary • The first LHC run with Ecm=7-8TeV was very successful.KEK has contributed for both LHC and ATLAS; • in detector construction, operation and physics analyses. • In the next 5 years, we are focusing on; • ATLAS operation and physics analyses with the ‘nominal’ LHC energy. • Preparation and start construction of the HL-LHC upgrades

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