Summer Camp on ILC Hitoshi Murayama (Berkeley, Kavli IPMU Tokyo) September 25, 2020
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New Physics Summer Camp on ILC Hitoshi Murayama (Berkeley, Kavli IPMU Tokyo) September 25, 2020 東京大学 2004.2.12 シンボルマーク+ロゴタイプ 新東大ブルー 基本形 漢字のみ 英語のみ Apology • I volunteered to give a talk but for some reason totally forgot about it. • I don’t have a dedicated assistant any more… • and yesterday was 32th anniversary • Thank you for rescheduling the talk for today! Disclaimer • I am trying to find new ways to exploit ILC for new physics searches. The content of the talk is somewhat sketchy and qualitative. You are warned that what I will discuss should not be taken literally. Your mileage may vary. Yes Higgs exists! ATLAS-CONF-2016-067 200 Data ATLAS Preliminary CMS-HIG-16-041 Let there be light -1 Background 180 s = 13 TeV, 13.3 fb Signal + Background -1 H→γγ, m = 125.09 GeV Preliminary 35.9 fb (13 TeV) H CMS What160 isSignal my weights / GeV S/B weighted sum of Data ∑ event categories 100 140 H(125) ggH VBF WH ZH ttH bbH tHjb tWH production mode? qq→ZZ, Zγ* 120 80 gg→ZZ, Zγ* ATLAS Simulation Preliminary H→ γγ s =13 TeV 100 Z+X Events / 4 GeV ttH leptonic 80 ttH hadronic H → ZZ has high resolution and large S/B. An 60 VH dileptons event categorization60 is performed based on the VH leptonic 40 VH MET different production modes (number of leptons, 40 VH hadronic tight jets, b-jets20 and MET) and ME based discriminants VH hadronic loose VBF tight sensitive0 to signal and background kinematics 20 10 VBF loose ggH fwd high-p Tt 5 ggH fwd low-p Tt 0 80 100 200 300 400 500 700 900 ggH central high-p 0 Tt 7 exclusive categories ggH central low-p weights - bkg m (GeV) Tt 4l 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 ∑ −for5 the main Higgs production modes Fraction of each signal process per category CMS110Preliminary 120 130 35.9140 fb-1 (13 TeV) 150 160 CMS Preliminary 35.9 fb-1 (13 TeV) ggH 4e untagged VH-hadr. tagged Jónatan PiedraVH-lept. tagged Untagged 39.68 exp. events mγγ [GeV] 4 VBF-1j tagged VBF µ VH-MET tagged WH, W X 2e2µ VBF-2j tagged ttH tagged 1.2 → VBF-1jet 1 9.44 exp. events WH, W l Events / bin → ν kin bkg tagged High resolution channel despite the small branching ratio (0.23% @ 125.09 GeV).ZH, Z→ X D 1 VBF-2jet 4.19 exp. events ZH, Z→2l 0.8 Diphoton events fall in exclusive ttH, VH, tagged VBF and untagged categories, tandtH, tt→ 0l+X 0.8 ttH, tt→1l+X an unbinned combined maximum likelihoodVH-hadronic 2.03fit exp.is eventsapplied on m tagged γγ ttH, tt→2l+X 0.6 0.6 VH-leptonic 0.36 exp. events tagged 14 0.4 0.4 VH-MET 0.12 exp. events tagged 0.2 0.2 ttH tagged 0.50 exp. events 0 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 100 110 120 130 140 150 160 170 5 signal fraction m4l (GeV) Standard Model Are we done? ©Particle Fever 5 Some exclusion limits 0 ~-g ~g production, ~g → qq χ∼ 1 σ = 10% 2500 ATLAS Simulation Preliminary bkg [GeV] 0 1 ∼ χ L dt = 300, 3000 fb-1, s = 14 TeV m ∫ 0-lepton combined 2000 ATLAS 20.3 fb-1, s = 8 TeV, 95% CL 95% CL limit, 3000 fb-1, 〈 µ 〉 = 140 95% CL limit, 300 fb-1, 〈 µ 〉 = 60 5σ disc., 3000 fb-1, 〈 µ 〉 = 140 1500 5σ disc., 300 fb-1, 〈 µ 〉 = 60 1000 Decay forbidden Erez Etzion, Tel Aviv University Lepton Photon 2019 500 !18 0 500 1000 1500 2000 2500 3000 m~g [GeV] HOME PAGE TODAY'Sbeen PAPER VIDEOthereMOST POPULAR beforeU.S. Edition hmurayama Help Search All NYTimes.com Science WORLD U.S. N.Y. / REGION BUSINESS TECHNOLOGY SCIENCE HEALTH SPORTS OPINION ARTS STYLE TRAVEL JOBS REAL ESTATE AUTOS ENVIRONMENT SPACE & COSMOS 315 Physicists Report Failure In Search for Supersymmetry MOST EMAILED RECOMMENDED FOR YOU By MALCOLM W. BROWNE articles viewed sleptogenesis Published: January 5, 1993 56 recently All Recommendations Three hundred and fifteen physicists worked on the experiment. FACEBOOK 1. LETTER TWITTER More to the Story on Arab Blacks Their apparatus included the Tevatron, the world's most powerful particle accelerator, as well as a $65 million detector weighing as GOOGLE+ 2. North Korea Claims Its Nuclear Arsenal Is Just a ‘Deterrent’ much as a warship, an advanced new computing system and a host of EMAIL other innovative gadgets. SHARE 3. North Korea Expels BBC Journalists Over Coverage But despite this arsenal of brains and technological brawn assembled PRINT at the Fermilab accelerator laboratory, the participants have failed to REPRINTS 4. Republicans Return to Congress Facing find their quarry, a disagreeable reminder that as science gets harder, Unavoidable Issue: Donald Trump even Herculean efforts do not guarantee success. 5. EDITORIAL In trying to ferret out ever deeper layers of nature's secrets, scientists are being forced to Mangia! Signore: Italian Court Spares accept a markedly slower pace of discovery in many fields of research, and the consequent Hungry Shoplifter rising cost of experiments has prompted public and political criticism. 6. North Korean General, Thought to Be Executed, Resurfaces To some, the elaborate trappings and null result of the latest Fermilab experiment seem to typify both the lofty goals and the staggering difficulties of "Big Science," a term coined in 7. Q. and A.: Jeremy Brown on the Cultural 1961 by Dr. Alvin M. Weinberg of Oak Ridge National Laboratory. Some regard such Revolution at the Grass Roots failures as proof that high-energy physics, one of the biggest avenues of big science, is fast approaching a dead end. 8. WHITE HOUSE LETTER Obama Weighs Visiting Hiroshima or Nagasaki Others call the latest experiment a useful, though inconclusive, step toward gauging the ultimate basis of material existence. The difficulty of science is increasing exponentially as 9. THE UPSHOT Where Democrats Like Hillary Clinton the scientists grope toward ultimates, they point out, and particle physicists believe that Least (Besides Vermont) society must accept the smaller increments and higher costs of progress, if progress is to continue. 10. Turkish Border Guards Accused of Attacking Syrian Refugees The paper reporting results of the latest big experiment appeared Dec. 14 in the prestigious journal Physical Review Letters. The names of the 315 scientists whose work Go to Your Recommendations » What’s This? | Don’t Show contributed to the paper, arranged in alphabetical order, occupied an entire page -- more than one-fifth the overall length of the report. Following this top-heavy opening, the paper concluded in essence that the scientists had failed to find what they were looking for. The particle accelerator used in the hunt for whimsically-named squarks and gluinos, hypothetical particles postulated by the popular but unproved theory of "supersymmetry," was the Fermilab Tevatron at Batavia, Ill. A conspicuous example of big science, this giant instrument was completed in 1983 as a $130 million upgrade of an existing accelerator. The Tevatron whirls counter-rotating bunches of protons and antiprotons around a ring four miles in circumference, smashing protons and antiprotons together at a combined energy of 1.8 trillion electron-volts. But accelerating particles is useless unless the results of their collisions can be observed and studied, and to do this, scientists associated with Fermilab built a gigantic accessory for the Tevatron: the C.D.F., for "Collider-Detector at Fermilab," which itself cost more than $65 million. The 315 scientists taking part in the "C.D.F. Collaboration" use this detector in somewhat the way a builder might use a succession of sieves to separate sand of varying degrees of coarseness. Instead of sand particles, however, the detector is rigged to record the passage of various kinds of elementary particles created by the collisions of protons and antiprotons. Better Late Than Never Even mSUSY~10 TeV ameliorates fine-tuning from 10–36 to 10–4 lore • LHC has not discovered any new physics • ILC energy is much lower than LHC • ILC will never discover new particles • focus on deviation from SM in precision measurements = indirect probe • maybe unusually difficult case at LHC? 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