SKKU HALF YEAR MEETING at 14.aug.2014 Department of Physics, Sungkyunkwan-university, Korea Dong-hyun kim

- SKKU Half-year meeting at 14.Aug.2014 - Plan( last 6 months ) February March April May June July August Construct 10 KCMS RPC chambers Trigger study Pythia 6 MC data Compare with Pythia 8 Higgs to WW - Emu channel study CMS RPC status study Field study at P5 SUCCESS FAIL Fail reason Part Reason Trigger study Post-doc’s lack of ability Pythia 6 MC data compare with Pythia 8 Lack of computing (Installing failed at CMSSW_6_2_X) - SKKU Half-year meeting at 14.Aug.2014 - - SKKU Half-year meeting at 14.Aug.2014 -

- SKKU Half-year meeting at 14.Aug.2014 - content CMS RPC 개요 CMS RPC Upgrade at LS1 Korea CMS RPC construction plan Korea CMS RPC construction Korea CMS RPC quality test Korea CMS RPC CMS RPC current study Data analysis study Event generation GG2VV MCFM Cross section GG2VV 8TeV Hw1 and Hw25 GG2VV and MCFM GG2VV graph PLAN - SKKU Half-year meeting at 14.Aug.2014 -

- SKKU Half-year meeting at 14.Aug.2014 - 개 요 LHC(Large Hadron Collider)는 2012-2013년 LS1(Long Shutdown) 기간 동안 CMS Experiment에 대하여 다양한 upgrade 프로그램을 기획하였다. 그 중에서 CMS는 LS1 기간 동안 Endcap 4-layer 부분을 추가 건설하여 CMS Level-1 trigger efficiency를 향상시키고 최종 Technical Design Report(TDR)를 완성한다. 4-Layer 건설을 위해 총 144개의 chamber가 CERN, BARC(India), GHENT(Belgium)의 3 Site에서 제작된다. Korea-CMS는 총 10개를 담당하여 CERN에서 제작 및 시험하여 납품한다. - SKKU Half-year meeting at 14.Aug.2014 -

- SKKU Half-year meeting at 14.Aug.2014 - CMS RPC Upgrade at LS1 CMS는 향후 Beam Energy와 Luminosity의 증가에 따른 검출기의 성능 향상을 위해 Endcap 부위에 RPC를 추가 건설한다. LS1 기간 동안 RE4/2 & RE4/3 부분에 총 144개에 해당하는 2개의 DISK를 제작하여 설치한다.( 1 Disk – 72개 Chamber ) 4–Layer를 건설함에 따라 최종 TDR을 완성한다. 추가 건설 부분 η=1.2 4-Layer 건설에 따라 앞으로 η < 1.6 부분에 해당하는 TDR의 전체 layout을 완벽하게 보완한다. RPC 추가에 따라 Trigger efficiency는 3 layers 때보다 향상되는 결과를 가져온다. - SKKU Half-year meeting at 14.Aug.2014 -

KOREA-CMS RPC Construction Plan Project 기간 : 2014년 2월 10 ~ 4월 18일 ( 약 60일 ) Project 총 책임자 : 최영일 교수님 Project 참여자 : 박사과정 – 김동현, 황찬욱 ( 2명 ) 제작 Chamber : RE4/2 type – 8개, RE4/3 type – 2개 Chamber Production Site : CERN – 904 site Chamber Quality Test Site : CERN – 904 site Chamber Installing Site : Point 5(CMS Detector center) - SKKU Half-year meeting at 14.Aug.2014 -

Korea CMS RPC Construction schedule - SKKU Half-year meeting at 14.Aug.2014 -

KOREA CMS RPC Construction Frame 준비 Gap 준비 Copper-Sheet Bottom Gap 완 료 ! Signal-Cable Gas-Pipe Top Gap Insulation 된 Frame을 미리 준비, 시험 검증된 Gap을 사용하여 Construction을 한다. 최종 조립 과정에서 Gas-pipe & Signal Cable을 연결한다. 조립 완료 후 Gas-pipe & Signal Cable 연결에 문제가 없는지 Leak test 및 접점 상태 점검을 진행한다. - SKKU Half-year meeting at 14.Aug.2014 -

KOREA-CMS RPC Quality Test Gap Visual Test - CMS RPC에 사용되는 Gap은 일정한 간격을 갖도록 하는 역할을 한다. - Gap의 Quality를 검증하기 위해 다음 리스트의 내용을 점검한다. Check List Pet Coating HV & GND Cable Gas Connector Pocket Bubble Bending - SKKU Half-year meeting at 14.Aug.2014 -

KOREA-CMS RPC Quality Test Gap Leak & Dark current Test - Gap 내부에는 Ionization을 위해 Gas mixture (95.2% C2H2F4, 4.5% iC2H10, 0.3% SF6)를 주입한다. 따라서 Gap의 Gas Leak Test를 진행하여 Quality를 확인한다. - Leak Test를 합격한 Gap에 10kV의 전압을 입력하여 약 3일간 Dark current를 측정한다. - Leak test standard : Up to 0.5 mbar / Dark current standard : Up to 0.5 μA 10 kV Leak Test Spacer Test 압력 변화 확인 압력 변화 확인 0.5μA < Leak & Spacer Test graph > < Dark current Test graph > - SKKU Half-year meeting at 14.Aug.2014 -

KOREA-CMS RPC Quality Test Cosmic-ray Test - Cosmic-ray를 이용하여 신호를 처리해주는 FEBs 및 Signal cable, Strip channel, Efficiency를 약 4일 동안 Chamber를 사용하는데 문제가 없는지 최종 점검을 한다. 만일 문제가 확인되면 해당 부위의 제품에 대한 교체 및 수리 작업을 진행한다. - 아래 그림은 각 Strip channel의 event 결과로 채널 15번의 이상을 확인 할 수 있다. Event - 0 < Chamber Strip channel Test graph > - SKKU Half-year meeting at 14.Aug.2014 -

KOREA-CMS RPC Quality Test Cosmic-ray Test Efficiency graph - Efficiency test는 Chamber의 3 part로 나뉘어 진행한다. - 맨 위와 아래에 놓여진 PMT가 Trigger 역할을 수행하며 Muon으로 발생하는 Chamber의 전기적 신호를 수집 및 필터링하여 최종적으로 Data가 Server에 저장된다. ETA C part ETA B part ETA A part < Chamber Efficiency Test graph > - SKKU Half-year meeting at 14.Aug.2014 -

- SKKU Half-year meeting at 14.Aug.2014 - KOREA CMS RPC RPC Super module - CMS RPC는 1개의 Disk에 36개의 Super module이 설치되며 1개의 Super module은 각 RE4/2 & RE4/3 type이 Frame에 조립되어 제작된다. - KOREA CMS는 총 8개의 Super module에 설치된다. Super module RE4/3 Type RE4/2 Type < CMS RPC Super module > < CMS RPC Disk > - SKKU Half-year meeting at 14.Aug.2014 -

KOREA CMS RPC < 1st KOREA CMS RPC Chamber 제작 기념 > - SKKU Half-year meeting at 14.Aug.2014 -

- SKKU Half-year meeting at 14.Aug.2014 - CMS RPC Current study < CMS RPC 원격화면 > < P5 현장 모습 > - SKKU Half-year meeting at 14.Aug.2014 -

- SKKU Half-year meeting at 14.Aug.2014 - CMS RPC Current study All of CMS RPC current distribution study at 7 and 9.6 kV Select problematic channels in disks( 2.5 𝜇A < ) Problematic channels base current study at 1kV < Current distribution at 9.6 kV > < Current distribution at 7 kV > < Current distribution at 1 kV > - SKKU Half-year meeting at 14.Aug.2014 -

𝚪 𝑯 𝒊𝒏 𝑯 →𝑾𝑾 →𝒆𝝂𝝁𝝂 Data analysis study - SKKU Half-year meeting at 14.Aug.2014 -

- SKKU Half-year meeting at 14.Aug.2014 - Event generation Selected mode Higgs -> 𝑊 + 𝑊 − -> el + elNu + mu + muNu Representative Feynman graphs for the LO amplitude of gg->WW-> l 𝜈 𝑙 𝜈 (Higgs signal (a) and continuum background (b) contributions) - SKKU Half-year meeting at 14.Aug.2014 -

- SKKU Half-year meeting at 14.Aug.2014 - Event generation gg2VV generation Generator – gg2VV-3.1.5 PDF selection – LHAPDF : cteq6l.LHpdf (In the LHAPDF-5.9.1) Process : gg -> (WW or H->WW) ->l~v v~l (different flavour) Selection cuts : minimal cuts -> minInvMassPhotonProp = 4.0 GeV - SKKU Half-year meeting at 14.Aug.2014 -

- SKKU Half-year meeting at 14.Aug.2014 - Event generation gg2VV generation Generated Job List( Job Total Number – 160(1 job : 25,000 ) / Event Total Number – 4,000,000 ) 8TeV - Hw1 - Sig / Int - Hw25 – Sig / Int / Cot 7TeV - Hw1 - Sig / Int - Hw25 - Sig / Int / Cot - SKKU Half-year meeting at 14.Aug.2014 -

- SKKU Half-year meeting at 14.Aug.2014 - event Generation MCFM generation Generator – MCFM 6.8 PDF selection – LHAPDF : cteq6l.LHpdf (LHAPDF Version 5.9.1) General options Sig – nproc : 123.ENMN / Cot – nproc : 127.ENMN / Int – 124.ENMN Used nproc nproc 𝒇 𝒑 𝟏 +𝒇 𝒑 𝟐 →… Order 123 𝐻 → 𝑊 + 𝜈 𝑝 3 + 𝑒 + 𝑝 4 + 𝑊 − 𝑒 − 𝑝 5 + 𝜈 𝑝 6 [top, bottom loops, exact] LO 124 𝐻 → 𝑊 + 𝜈 𝑝 3 + 𝑒 + 𝑝 4 + 𝑊 − 𝑒 − 𝑝 5 + 𝜈 𝑝 6 [only H, 𝑔𝑔→𝑊𝑊 intf. 127 𝑊 + 𝜈 𝑝 3 + 𝑒 + 𝑝 4 + 𝑊 − 𝑒 − 𝑝 5 + 𝜈 𝑝 6 [(𝑔𝑔→𝑊𝑊) squared] 126 𝑊 + 𝜈 𝑝 3 + 𝑒 + 𝑝 4 + 𝑊 − 𝑒 − 𝑝 5 + 𝜈 𝑝 6 [𝑔𝑔 𝑜𝑛𝑙𝑦, (𝐻+𝑔𝑔→𝑊𝑊) squared - SKKU Half-year meeting at 14.Aug.2014 -

Cross-section (fb) at 8 TeV (GG2VV)   8TeV HW1 All channel EleMu channel Data Total Luminocity OnPeak Shoulder Tail Signal 17.9978 ± 0.0008 17.5663 0.1731 0.2584 6.1462 6.0026 0.0578 0.0858 Interference 32.2422 ± 0.0015 16.6325 14.0170 1.5927 10.7365 5.5399 4.6623 0.5343 Continuum 16.5574 ± 0.0015 14.6734(Head) 1.8840 5.514 4.8869(Head) 0.6271 8TeV HW25 All channel EleMu channel Data Total OnPeak Shoulder Tail Signal 28.3501 ± 0.0013 17.5681±0.0008 4.2941±0.0002 6.4879±0.0003 9.4554 5.8651 1.4346 2.1557 Interference 37.2656 ± 0.0015 16.6536±0.0007 15.0051±0.0006 5.6070±0.0002 12.4215 5.5532 5.0007 1.8676 Continuum 16.5574 ± 0.0015 14.6734 ±0.0013 (Head) 1.8840±0.0002 5.514 4.8869 (Head) 0.6271 - SKKU Half-year meeting at 14.Aug.2014 -

- SKKU Half-year meeting at 14.Aug.2014 - Number of Events and cross-section – Hw1 8TeV Before Split Data All Channel Total cross-section muP_eleM muP_tauM eleP_muM eleP_tauM tauP_muM tauP_eleM Signal 3998353 108.0952 ± 0.0048 665724 666322 667809 665477 666675 666346 Interference 3999076 193.8387 ± 0.0090 665187 666900 666482 666115 666838 667554 Continuum 4000000 99.4059± 0.0090 666254 665957 665844 667322 666987 667636 After Split SigOnPeak 390236 105.5036 ± 0.0047 64990 65113 64977 65056 65126 64974 SigShoulder 38455 1.0397 ± 0.00005 6396 6438 6404 6436 6343 SigTail 57402 1.5519 ± 0.00007 9457 9622 9606 9533 9671 9513 IntOnPeak 412831 100.0674 ± 0.0046 68609 68891 68561 68700 68894 69176 IntShoulder 347347 84.1952 ± 0.0039 58133 57761 57673 58099 57832 57849 IntTail 197548 9.5769 ± 0.0004 33061 32774 33213 32578 32938 32984 CotHead 354409 88.0926 ± 0.0080 59296 59071 58869 58921 59255 58997 CotTail 455152 11.3133 ± 0.0010 75902 75595 75605 75762 75778 76510 Note: gg2vv generated only Lept1_Plus Lept2_Minus channel. Hw25 Continuum is used. Total cross-section = xSec(muP_eleM) * nEvents(Total) / nEvents(muP_EleP) - SKKU Half-year meeting at 14.Aug.2014 -

- SKKU Half-year meeting at 14.Aug.2014 - Number of Events and cross-section – Hw25 8TeV Before Split Data All Channel Total cross-section muP_eleM muP_tauM eleP_muM eleP_tauM tauP_muM tauP_eleM Signal 3998986 170.0066 ± 0.0078 666866 665800 666891 666295 666030 667104 Interference 3999219 223.7546 ± 0.0090 666057 666202 666971 666349 667477 666163 Continuum 4000000 99.4059± 0.0090 666254 665957 665844 667322 666987 667636 After Split SigOnPeak 247915 105.4422 ± 0.0048 41416 41238 41284 41041 41326 41610 SigShoulder 120574 25.6410 ± 0.0012 20106 20225 20142 19856 20148 20097 SigTail 915162 38.9233 ± 0.0018 151781 152998 152292 152741 152436 152914 IntOnPeak 358140 100.1801 ± 0.0040 59640 59528 59600 59823 60099 59450 IntShoulder 321430 89.9115 ± 0.0036 53264 53499 53640 53740 53833 53454 IntTail 601719 33.6630 ± 0.0014 100334 100072 100089 100236 100427 100561 CotHead 354409 88.0926 ± 0.0080 59296 59071 58869 58921 59255 58997 CotTail 455152 11.3133 ± 0.0010 75902 75595 75605 75762 75778 76510 Note: gg2vv generated only Lept1_Plus Lept2_Minus channel. Total cross-section = xSec(muP_eleM) * nEvents(Total) / nEvents(muP_EleP) - SKKU Half-year meeting at 14.Aug.2014 -

- SKKU Half-year meeting at 14.Aug.2014 - Cross section GG2VV & MCFM cross-section with different PDF set Type Nproc GG2VV MCFM cteq6l (external) mstw2008lo68cl cteq6_l (internal) mstw8lo(internal) Sig 123 17.998 +/- 0.001 23.300 +/- 0.014 16.465 +/- 0.020 21.054 +/- 0.065 total 126 32.242 +/- 0.002 41.777 +/- 0.002 31.649 +/- 0.072 41.037 +/- 0.092 Int 124 -2.313(guess) -3.005(guess) -1.323 +/- 0.004 -1.739 +/- 0.005 Cot 127 16.557 +/- 0.002 21.482 +/- 0.013 16.467 +/- 0.023 21.331 +/- 0.030 GG2VV set • CTEQ6L.LHpdf (base line) • mH: 125 GeV • Width_SM: 4.15 MeV • D.S: mWW/2 • No Cut on leptons: • All channels (t,mu), (t,e),(mu,e) • 7, 8 TeV with width 1 and 25 HwSM - SKKU Half-year meeting at 14.Aug.2014 -

- SKKU Half-year meeting at 14.Aug.2014 - Gg2vv graph < ggF 8TeVHw1 Sig & Bkg & Bkg+Sig graph > < ggF 8TeVHw1 & Hw25 Signal graph > - SKKU Half-year meeting at 14.Aug.2014 -

- SKKU Half-year meeting at 14.Aug.2014 - Plan( 6 months ) September October November December January February March HWW study Trigger study CMSSW_7_X_X preparing CMS RPC Current study CMS RPC Monitoring at P5 - SKKU Half-year meeting at 14.Aug.2014 -

Thank you for attention