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“Pigiama” TISB 24.04.2001 (o 25.04.2001) CERN

Gruppo di lavoro sul t : Status report. “Pigiama” TISB 24.04.2001 (o 25.04.2001) CERN. Giuseppe Bagliesi Simone Gennai Giacomo Sguazzoni. Guardando un solo jet…. Questa configurazione + L3tk = taglio in P T  Riduzione del fondo non sufficiente!!!. 1 o t jet. L1 Tau (calo). L2 Tau

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“Pigiama” TISB 24.04.2001 (o 25.04.2001) CERN

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  1. Gruppo di lavoro sul t:Status report “Pigiama” TISB 24.04.2001 (o 25.04.2001) CERN • Giuseppe Bagliesi • Simone Gennai • Giacomo Sguazzoni TISB: Gruppo del Tau

  2. Guardando un solo jet… Questa configurazione + L3tk = taglio in PT  Riduzione del fondo non sufficiente!!! 1ot jet L1 Tau (calo) L2 Tau (calo) Catena di trigger 1ot jet L3pxl Tau (iso) Qui sta il nostro contributo htt L3tk Tau 2ot jet TISB: Gruppo del Tau

  3. L3tk sul 1o jet MH=200GeV MH=500GeV 0 < PT cut < 40 GeV Eff vs. Rej (wrt L3pxl) with the full Tk reconstruction: is really hard to get good signal efficiency and good Bkg rej looking only at 1st jet. TISB: Gruppo del Tau

  4. Guardando due jet… 1ot jet .OR. L1 Tau (calo) L1 Tau (calo) Catena di trigger 1ot jet Catena di trigger 2ot jet L2 Tau (calo) Qui sta il nostro contributo L3tk Tau htt L3pxl Tau (iso) 2ot jet TISB: Gruppo del Tau

  5. L3tk sul 2o jet: Tracking regionale 1st tau jet Z o=(0,0,0) PV in p=(0,0,z0) 2nd tau jet: L1 2nd tau jet candidate Reg Tk reconstructs tk in the 2nd jet cone with tk vertex @ (0,0,z0) TISB: Gruppo del Tau

  6. L3tk sul 2o jet: selezione eventi Possible L3tk selections applied to 2nd jet: 1. Isolation criteria similar to L3pxl with full reco Tk (A) 2. Cut on the number of reconstructed Tk in the cone(B) • there are still some parameters to be optimised • Very low PT cut is applied at L3Tk (~ 1 GeV) • Both algorithms have good signal efficiency andachieve the desired bkj rejection TISB: Gruppo del Tau

  7. PRELIMINARY ! Global eff and bkg Rate • 1. Isolation criteria of L3pxl with full reco Tk(A) • 2. Cut on the number of reconstructed Tk in the cone(B) Really near to our goal ! Need more statistics ! TISB: Gruppo del Tau

  8. Concludiamo… We have analysed 2nd L1 tau jet in the event reconstructing tracks with regional Tk. • 2 L3Tk selection criteria studied: • Full Tk isolation of tracks inside the cone (A). • Number of reconstructed tracks in jet cone (B). • We achieve to get a Rate of about 10 Hz after all Trigger Levels with a global signal eff  25% • All cuts are not yet optimised Buona notte!!! TISB: Gruppo del Tau

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