1. 6 December 2004Exotic Trigger Meeting1 SUSY_DILEPTON TRIGGERS: studies and proposed updates M.Giordani,B.Heinemann,G.Pauletta, M.Rossi,P.Wittich

2. 6 December 2004 Exotic Trigger Meeting 2 OUTLINE Status before shutdown and major concerns SUSY trigger studies up to the shutdown:  Stability of x-sections  x-sections vs. L (cm -2 s -1 )  Overlap studies Studies for new proposal:  x-sections  Typical signal efficiency Conclusions

3. 6 December 2004 Exotic Trigger Meeting 3 SUSY TRIGGERS PRE-SHUTDOWN Major concerns:  large inclusive L2 cross section of complementary paths  possible growth factor effect @ high luminosity Trigger group interim countermeasure:  L2_CEM12_PT8 changed to L2_CEM8_PT8_DPS (June 2004)  Trigger studies for better understanding rates CORE PATHSCOMPLEMENTARY PATHS L1L22 Low-pt leptonsMedium-pt lepton+track High-pt inclusive lepton L32 Low-pt leptons  8 core and 10 complementary paths (CDF6074) L2 COMPLEMENTARY: L2_CMUP6_PT8 L2_CEM12_PT8 L2_CEM8_PT8_CES3_&_TRK8

4. 6 December 2004 Exotic Trigger Meeting 4 L2 X-SECTIONS (nb) vs. time L3 Monitor dataset ~50pb (MONITOR_L3TAG_PS200) σ EXC e.g. L2_CEM12_PT8 σ TOT (nb)σ EXC (nb) L2_CMUP6_PT8180100 (55%) L2_CEM8_PT8_CES3_&_TRK811010 (9%) L2_CEM12_PT827060 (22%) σ TOT On average (σ EXC is the effective x-section of the L2 path)

5. 6 December 2004 Exotic Trigger Meeting 5 L2 X-SECTIONS (nb) vs. L (cm -2 s -1 ) L2_CMUP6_PT8L2_CEM8_PT8_CES3_&_TRK8 Inclusive muon:  No major growth factor  Used by variety of physics group (not only exotic) Electron+track:  σ tot rises  Adds very little to global L2 bandwidth L3 Monitor dataset ~40pb (MONITOR_L3TAG_PS200) σ TOT σ EXC

6. 6 December 2004 Exotic Trigger Meeting 6 L2 X-SECTIONS (nb) vs. L (cm -2 s -1 ) L2_CEM12_PT8 Inclusive electron:  No growth factor in σ tot  Growth in σ EXCL due to dynamically prescaled competing triggers  Effective σ ≤ 100nb L3 Monitor dataset ~6pb (MONITOR_L3TAG_PS200) σ TOT σ EXC

7. 6 December 2004 Exotic Trigger Meeting 7 L2 OVERLAPS Inclusive electron: L2_CEM12_PT8  50% overlap with L2_CEM16_PT8 (conservative) Electron+track: L2_CEM8_PT8_CES3_&_TRK8  75% overlap with L2_CEM8_PT8_CES3_&_TRK5_DPHI10  60% overlap with L2_CEM12_PT8  35% overlap with L2_CEM16_PT8 ALMOST NO CHANGE IN OVERLAPS WITH LUMINOSITY

8. 6 December 2004 Exotic Trigger Meeting 8 SUSY TRIGGERS NEW PROPOSAL L1L2L32 Low-pt leptonsMedium-pt lepton+track High-pt inclusive lepton  14 paths Pros : to take advantage of a largest acceptance Cons : L3 more structured  Evaluated x-sections for new primitives

9. 6 December 2004 Exotic Trigger Meeting 9 CEM PATHS L2 (nb)L3 (nb) CEM4_CEM496±66±2 CEM8_TRK8152±810±2 CEM12246±1055±5 CEM12_ISO370±528±3 CEM12_ISO6130±538±4 CEM16144±1025±3 Total L2 x-section for CEM paths: (4 || 8 || 12 || 16) σ TOT  400 nb using CEM12  320 nb using CEM12_ISO3  376 nb using CEM12_ISO6  300 nb dropping CEM12 ELECTRON_CENTRAL_PS5K_L1_CEM4_PT4 ~25μb @ L = 90 × 10 30 cm -2 s -1

10. 6 December 2004 Exotic Trigger Meeting 10 CMUP PATHS L2 (nb)L3 (nb) CMUP4_CMUP443.5±2.12.2±0.5 CMUP8_TRK838.8±2.09.7±0.9 CMUP1281.4±2.817.7±1.2 L2 (nb) Considering CMUP8 absent CMUP4_CMUP425.8±1.628.4±1.7 CMUP8_TRK8011.8±1.1 CMUP12054.0±2.3 MUON_PS1000_L1_CMUP6_PT4 ~8μb @ L = 90 × 10 30 cm -2 s -1 σ TOT σ EXC

11. 6 December 2004 Exotic Trigger Meeting 11 CMX PATHS L2 (nb)L3 (nb) CMX8_TRK841.5±4.311.6±2.2 CMX12101.8±5.524.9±1.7 L2 (nb) Considering CMX6_PT10 absent CMX8_TRK86.6±1.912.2±2.5 CMX12071.9±5.2 For the time being there is no CMX4_CMX4 path because no corresponding L1 bit is available MONITOR_PS200_L3TAG & L2_AUTO_L1_CMX6_PT8_CSX ~220nb @ 90 × 10 30 cm -2 s -1 σ TOT σ EXC

12. 6 December 2004 Exotic Trigger Meeting 12 TYPICAL SIGNAL EFFICIENCY Considered: 2 typical signal samples with low pt multilepton signatures  Chargino and neutralino production  3l  Gluino and squark production  2l Trigger behaviour roughly deduced from offline quantities. Examples:  CEM4: a central tight electron, E T >6GeV,P T >4GeV  CMX4: a muon with a CMX stub in the same wedge with P T >4GeV

13. 6 December 2004 Exotic Trigger Meeting 13 CHARGINO and NEUTRALINO PRODUCTION m0m0 m 1/2 4||8||124||168||164||8||16164||8 10018063.753.955.759.045.842.9 7416873.165.865.169.956.353.7 17523073.866.565.070.656.554.8 Acceptance for different trigger scenario for events with 3 HEPG leptons anywhere in η 4 = 2 low pt leptons 8 = medium-pt lepton + track 12 or 16 = high-pt inclusive lepton 16 instead of 12 reduces the acceptance by 4%

14. 6 December 2004 Exotic Trigger Meeting 14 GLUINO and SQUARK PRODUCTION Sample of 19k events: m gluino = 260 GeV/c 2 m squark ~ 300 GeV/c 2 m neutralino1 ~ 36 GeV/c 2 m chargino ~ 80 GeV/c 2 4 = 2 low pt leptons 8 = medium-pt lepton + track 12 = high-pt inclusive lepton Trigger acceptance for events with 2 leptons from a SUSY particle Leading lepton flavor 4812 CEM25%53%43.5% CMUP14.5%32.5%28% CMX14%28%27% SCENARIOAcceptance No 12 paths 100% No 8 paths 93% No 4 paths99%

15. 6 December 2004 Exotic Trigger Meeting 15 CONCLUSIONS -1- Before the shutdown  SUSY dilepton complementary path healthy: No appreciable growth factors No solid reason for removing L2_CEM12_PT8 New Proposal  New L2 muon primitive x-sections are reasonable  About CEM path: CEM12_ISO3 reduces x-section by 20%, but inefficient @ high luminosity Dropping CEM12, total L2 CEM path x-section reduced by 25%

16. 6 December 2004 Exotic Trigger Meeting 16 CONCLUSIONS -2- Typical signal studies  Chargino and neutralino production Dropping the 12 paths and keeping the 16 paths produces a undesirable 4% acceptance reduction Dropping anyone of the 4, 8, 16 paths will seriously impact the acceptance  Squark and gluino production Dropping the 8 paths affects most the trigger acceptance (7%) Need to evaluate inclusive lepton trigger vs. 12 paths

17. 6 December 2004 Exotic Trigger Meeting 17 Back-up