QCD Trigger Report Charge: 1)Plans for future and which triggers should never be prescaled? 2)Which triggers are currently used: purity and trigger studies.

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Presentation transcript:

QCD Trigger Report Charge: 1)Plans for future and which triggers should never be prescaled? 2)Which triggers are currently used: purity and trigger studies done for these? 3)Any triggers that are only for studies that can be done in special runs? 4)Should there be a trigger list release structure? (probably)

QCD Jet Triggers L1: demand N towers have at least a given E T –Multi-tower requirement favors two jet events  bias from limited L1 coverage (A.Kupco) L2: require one jet of given E T (studies to implement this are in progress) (J. Krane) L3: require one jet of given E T –Very similar to RECO E T except merge/split, vertex position (G. Davis)

QCD’s trigger plan: visual   = 1 L2 (or L3) threshold too low: a difficult efficiency estimate maximize Minimize inefficient L1 region 

L1: two jets in trigger region With  coverage to 2.4, “one jet” sample is only 3-4% less efficient during turn-on. A. Kupco

L3 Efficiency and Cuts Have a generalized curve from M&P… No need to study each specific threshold Reco E T (GeV) L3 E T (GeV) G. Davis

L2 E T vs Reco E T (V8.2 data) Reco E T L2 E T Reco E T L2 E T J. Krane

L2 Efficiencies (prelim) Example: L2 cut of 40 approx 95% efficient at 75

QCD 8.2/9.0 Triggers In Trigger list 8.2 the QCD group will be using the following triggers for inclusive jet cross section, dijet mass, and other QCD analyses (Analysis contact person Sasha Kupco). JT_45TT CJT(2,5) low JT_65TT CJT(3,5) low JT_95TT CJT(4,5) ultra Note: at 40E30 34/34/0.23 (Needs L2 soon) JT_125TT CJT(4,7) ultra Note: at 40E30 8/8/.05 (100% overlap with JT_95TT) Efficiency studies done for these triggers The following triggers are for diffractive jet production, double pomeron exchange and FPD commissioning (Analysis contact person Michael Strang). JT_25TT_NG low zero_bias_GapN 0.05 Hz JT_25TT_GapN low zero_bias_GapS 0.05 Hz JT_25TT_GapS low zero_bias_GapSN 0.05 Hz JT_25TT_GapSN medium Studies in progress

QCD 8.2 Temporary Triggers This trigger was inserted for L2 studies and we would jettison it in a Trigger V9 (ideally after incorporating L2 into main triggers): JT_45TT_L2 These triggers were inserted for vertex studies and would be jettisoned in Trigger V9 (ideally after incorporating vertex into main triggers): JT_50TT_JT_65PV JT_70TT_JT_95PV JT_95TT_JT_125PV

QCD Future Plans Short term: Incorporate L2 and vertex information (sharper turn-on at L3) should allow JET_95TT to remain unprescaled indefinitely Medium term: Add back low ET ref set and increase coverage to |  | < 3.2, start adding proton triggers, dedicated photon triggers Long term: Change to large tiles (less biased, lower rates into L2), add more proton triggers