1 / 17

SUSY_DILEPTON TRIGGERS: studies and proposed updates

SUSY_DILEPTON TRIGGERS: studies and proposed updates. M.Giordani,B.Heinemann,G.Pauletta, M.Rossi ,P.Wittich. 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

Download Presentation

SUSY_DILEPTON TRIGGERS: studies and proposed updates

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. SUSY_DILEPTON TRIGGERS: studies and proposed updates M.Giordani,B.Heinemann,G.Pauletta, M.Rossi,P.Wittich 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-2s-1) • Overlap studies • Studies for new proposal: • x-sections • Typical signal efficiency • Conclusions 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  8 core and 10 complementary paths (CDF6074) L2 COMPLEMENTARY: L2_CMUP6_PT8 L2_CEM12_PT8 L2_CEM8_PT8_CES3_&_TRK8 Exotic Trigger Meeting

  4. L2 X-SECTIONS (nb) vs. time On average (σEXC is the effective x-section of the L2 path) e.g. L2_CEM12_PT8 σTOT σEXC L3 Monitor dataset~50pb (MONITOR_L3TAG_PS200) Exotic Trigger Meeting

  5. L2 X-SECTIONS (nb) vs. L (cm-2s-1) L2_CMUP6_PT8 L2_CEM8_PT8_CES3_&_TRK8 σTOT σTOT σEXC σEXC • Inclusive muon: • No major growth factor • Used by variety of physics group (not only exotic) • Electron+track: • σtot rises • Adds very little to global L2 bandwidth L3 Monitor dataset~40pb (MONITOR_L3TAG_PS200) Exotic Trigger Meeting

  6. L2 X-SECTIONS (nb) vs. L (cm-2s-1) L2_CEM12_PT8 σTOT • Inclusive electron: • No growth factor in σtot • Growth in σEXCLdue to dynamically prescaled competing triggers • Effective σ≤ 100nb σEXC L3 Monitor dataset~6pb (MONITOR_L3TAG_PS200) 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 Exotic Trigger Meeting

  8. SUSY TRIGGERS NEW PROPOSAL  14 paths Pros :to take advantage of a largest acceptance Cons :L3 more structured  Evaluated x-sections for new primitives Exotic Trigger Meeting

  9. CEM PATHS ELECTRON_CENTRAL_PS5K_L1_CEM4_PT4 ~25μb @ L = 90 × 1030 cm-2 s-1 σTOT Total L2 x-section for CEM paths: (4 || 8 || 12 || 16) •  400 nb using CEM12 • 320 nb using CEM12_ISO3 • 376 nb using CEM12_ISO6 • 300 nb dropping CEM12 Exotic Trigger Meeting

  10. CMUP PATHS MUON_PS1000_L1_CMUP6_PT4 ~8μb @ L = 90 × 1030cm-2s-1 σTOT σEXC Exotic Trigger Meeting

  11. CMX PATHS MONITOR_PS200_L3TAG & L2_AUTO_L1_CMX6_PT8_CSX ~220nb @ 90 × 1030 cm-2s-1 σTOT σEXC For the time being there is no CMX4_CMX4 path because no corresponding L1 bit is available 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, ET>6GeV,PT>4GeV • CMX4: a muon with a CMX stub in the same wedge with PT>4GeV Exotic Trigger Meeting

  13. CHARGINO and NEUTRALINO PRODUCTION Acceptance for different trigger scenario for events with 3 HEPG leptons anywhere in η 16 instead of 12 reduces the acceptance by 4% 4 = 2 low pt leptons 8 = medium-pt lepton + track 12or16 = high-pt inclusive lepton Exotic Trigger Meeting

  14. GLUINO and SQUARK PRODUCTION Sample of 19k events: mgluino = 260 GeV/c2 msquark ~ 300 GeV/c2 mneutralino1 ~ 36 GeV/c2 mchargino ~ 80 GeV/c2 Trigger acceptance for events with 2 leptons from a SUSY particle 4 = 2 low pt leptons 8 = medium-pt lepton + track 12 = high-pt inclusive lepton 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% 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 the4, 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 Exotic Trigger Meeting

  17. Back-up Exotic Trigger Meeting

More Related