TowerOnly pi0 Finder

1
Tower-Only pi0 Finder

• Algo
• Eta dependence
• Comparison to M-C
• Utility in 2004

Jan Balewski, IUCF October 4, 2004
2
EEMC (Tower Only) ?0 Reconstruction
invM??12? (E1 E2)
E1- E2 Z?0 E1 E2
?12

• Cuts
• seed gt0.7 GeV
• seed/cluster gt0.7

3
MinB 2004 Data vs. M-C(12 sectors)
2004 minB data
Data 3,100,000 minB triggered eve 20,000 pi0
bckg subtr, s/b0.76 mPi0141 MeV sig36
MeV ? 1 pi0 / 160 minB eve
M-C g2004x minB
M-C 550,000 minB PYTHIA eve 3,700 pi0 bckg
subtr, s/b0.57 mPi0129 MeV sig29 MeV ? 1
pi0 / 150 minB eve
4
Eta dependence
2004 minB data
Pi0 Mass (MeV)
170
135
110
?2.0
Mass width (MeV)
40
30
Pi0 yield
6000
?1.05
3.1M minB eve
0
?1.05
?2.0
5
Eta Dependence (2)
2004 minB data
M-C g2004x minB
Pi0 Mass (MeV)
Pi0 Mass (MeV)
170
170
135
135
110
110
Mass width (MeV)
Mass width (MeV)
40
40
30
30
6000
1200
3.1M minB eve
0.55 M minB eve
Pi0 yield
Pi0 yield
0
0
?1.05
?2.0
?1.05
?2.0
6
Utility of Tower-Only Algo
New calibration
Dead/hot towers
?1.05
?2.0