Jet energy correction (Zmumu, 10k) June 4,2008 Jongseok Lee (Sungkyunkwan University) 1.

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Presentation transcript:

Jet energy correction (Zmumu, 10k) June 4,2008 Jongseok Lee (Sungkyunkwan University) 1

# of jet 2 red : calojet green : genjet pt>15, ΔR(jet,mu)>0.5

Jet energy correction factor 3 P T (calojet) factor

Matching jet with MC μ 4 Δ R(genjet,mcmu) P T (genjet)/P T (mcmu) Δ R(corjet,mcmu) P T (corjet)/P T (mcmu) Δ R(genjet,mcmu) Δ R(corjet,mcmu) P T (genjet)/P T (mcmu)P T (corjet)/P T (mcmu) no cut pt>15

nConstituent 5 no corrected nC pt>15 no corrected nC pt>15 ΔR(jet,mcmu)>0.5 red : corjet, black : genjet corrected nC pt>15 corrected nC pt>15 ΔR(jet,mcmu)>0.5

Average P T of jet tower 6 corrected nC pt>15 corrected nC pt>15 ΔR(jet,mcmu)>0.5 red : corjet, black : genjet

# of jet 7 pt>15, ΔR(jet,mu)>0.5 pt>15 pt>15, nC>=5, ΔR(jet,mu)>0.5 pt>15, nC>=5 red : corjet, black : genjet

PTPT 8 pt>15, ΔR(jet,mu)>0.5 pt>15 pt>15, nC>=5, ΔR(jet,mu)>0.5 pt>15, nC>=5

η 9 red : corjet, black : genjet pt>15, ΔR(jet,mu)>0.5 pt>15 pt>15, nC>=5, ΔR(jet,mu)>0.5 pt>15, nC>=5

Jet efficiency (corjet/genjet) 10 pt>15, ΔR(jet,mu)>0.5 pt>15 black : pt>15, ΔR(jet,mu)>0.5 red : pt>15 black : pt>15, ΔR(jet,mu)>0.5 red : pt>15

back up 11

Jet energy correction factor 12 Many reasons why a calorimeter jet energy differs from an underlying particle and parton jet energies:  Energy offset due to electronics noise and event pile-up  Energy lost due to energy thresholds applied at cell and tower level  Energy lost due to particles bent away in 4T magnetic field  Nonlinear HCAL response (e/h < 1)