2vtx tagged dijets mass resolution study

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Presentation transcript:

2vtx tagged dijets mass resolution study Univeristy of Notre Dame Hong Luo Mar 16th 2005

Get the Pt resolution of 2vtx tagged Jet from data. Method Get the Pt resolution of 2vtx tagged Jet from data. Use the Pt resolution to do the Jet Pt smearing for QCD MC samples, then get the mass resolution. Data selection: All QCD trigger data (by d0correct v-00-00-06) up to April, 2004 in Common Sample Group: ~32Million events ( 241.5 pb-1 ) . Secondary Vertices skimmed: Removed bad events. (offline data quality: SMT,CAL,CFT,MUO &JET) Request both two leading jets contained a secondary vertex. Central region requirement: Both jets with |Rapidity|<0.8 . ~20200 events.

Jet Pt resolution study X: Average Jet Pt : (Pt0 + Pt1)/2 Y: Pt imbalance A with RMS error bar: A = 2*( Pt0 – Pt1 ) / (Pt0 + Pt1) Profile Plot for Jet Pt imbalance Event cut: 1. Each events contains only two jets. 2. Jet type: both are JCCB and CoorJCCB. 3. Jet Pt cut for Jet Trigger efficient: JT_25: 50Gev JT_45: 70Gev JT_65: 100Gev JT_95: 150Gev 4. Jets || cut: || > 2.84.

Jet Pt resolution study ---- fit result ---- error applied results Parameter correlation coefficients: P0 P1 P2 P0 1 -0.678 0.161 P1 -0.678 1 -0.737 P2 0.161 -0.737 1 [(Pt) / Pt]2 = [1/2 * (A)]2 Fitting function: [(Pt) / Pt]2 = P02 / X2 + P12 / X + P22

Mass resolution study Use MC qcd samples with different Pt range: Apply the same criteria of event selection and cut. Do the Jet Pt smearing to MC qcd samples: Jet Pt smeared as a normal distribution with RMS calculated by the obtained Jet Pt resolution curve For each event, draw randomly to get the smeared Jets Pt. Then recaculate the invariance mass: M’ Get the (mass): (M’ – M) / M. (mass) distribution for different Pt range MC qcd samples. Red curve: gaussian fits.

Mass resolution Curve ---- fit result ---- error applied results Parameter correlation coefficients: P0 P1 P2 P0 1 -0.936 -0.905 P1 -0.936 1 -0.992 P2 -0.905 -0.992 1 Fitting function: [(M) / M]2 = P02 / X2 + P12 / X + P22