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SUSY: Rp with . Multi-electrons events

SUSY: Rp with . Multi-electrons events. SUSY framework Signal and topology Background Expected results Conclusion. Pavel Demine (ISN Grenoble). SUSY framework. mSUGRA model : m 0 , m 1/2 , A 0 , tan( ) , sign() R-parity violated : Double production in conservated Rp

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SUSY: Rp with . Multi-electrons events

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  1. SUSY: Rp with . Multi-electrons events • SUSY framework • Signal and topology • Background • Expected results • Conclusion Pavel Demine (ISN Grenoble) P. Demine (ISN Grenoble)

  2. SUSY framework • mSUGRA model : m0 , m1/2 , A0 , tan() , sign() • R-parity violated : • Double production in conservated Rp • Decay of LSP via Rp. • One dominant coupling : L : left-handed lepton doublet E : right-handed lepton singlet P. Demine (ISN Grenoble)

  3. SUSY framework • Vertex : • LSP decay with : P. Demine (ISN Grenoble)

  4. Signal topology (cont.) • Final state. 2 LSP decay : • at least 4 high pT leptons+ ET. P. Demine (ISN Grenoble)

  5. multi electron background • Physics processes. • ZZ/ZWleptons : 1.3 pb, 2.7 pb • QCD with pT > 10 + e fake :  600 pb • Fake leptons • e fake (probability  10-4) to be studied •  fake P. Demine (ISN Grenoble)

  6. Preliminary study with PGS • Scan in the SUGRA parameters space. • m0 : 80 to 500 step of 20 • m1/2 : 100 to 360 step of 20 • A0 : 0 • tan() : 2, 5 • sign() : +1, -1 • 1000 events per point P. Demine (ISN Grenoble)

  7. Trigger and events selection • Selection criteria: • Ne= 3 (|e| < 1, pT 10 GeV/c) • Mee < 80 GeV/c2 or Mee >100 GeV/c2 • Trigger simulation: • pT 1st 25GeV/c OR • pT 2nd 12GeV/c P. Demine (ISN Grenoble)

  8. Background P. Demine (ISN Grenoble)

  9. Signal trig #1: 1e pT>25GeV/c trig #2: 2e pT>12GeV/c P. Demine (ISN Grenoble)

  10. Trigger simulation PT 2nd e Not selected by 1e pT>25GeV/cOR 2e pT>12GeV/c trigger PT 1st e P. Demine (ISN Grenoble)

  11. Cross-sections sign() = -1 sign() = 1 m 0 m 0 m1/2 m1/2 P. Demine (ISN Grenoble)

  12. Efficiencies sign() = 1 sign() = -1 m1/2 m1/2 m 0 m 0 P. Demine (ISN Grenoble)

  13. Efficiencies (cont.) • 20k events for each background. • The most difficult to estimate is QCD (efake background). P. Demine (ISN Grenoble)

  14. Exclusion contours Backgrd studies are only beginning • L = 200 pb-1 • 90% Conf. level. sign() = 1 sign() = -1 P. Demine (ISN Grenoble)

  15. Run I results P. Demine (ISN Grenoble)

  16. Conclusion • Exclusion contours are made with 3e final state • For more confident results : Need to use full reconstruction and PMCS. P. Demine (ISN Grenoble)

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