1. Song LIANG Email: liangs @ ihep.ac.cn CMS-IHEP, China 2009.11.06
Hadron Shower Shape
Song LIANG
ihep.ac.cn
CMS-IHEP, China

2. Data Sample Pi- sample: Eta = 0.65779 Phi = 0.21976 E = 100.0 GeV
Events:1000

3. The number of crystals which the pion track pass through

4. Method 1: The shower shape in all crystals.
From the reconstruction hit
From the fitting of the shower formula
Method 1: Using track extrapolation to find the pion track in the ECAL. Fit the start point using the formula.

5. Method 1: The shower shape in 9x9 crystals around the crystal
which has the highest deposit energy.
From the fitting of the shower formula
From the reconstruction hit

6. Method 2 The shower shape in all crystals.
From the reconstruction hit
From the fitting of the shower formula
Method 2: Suppose that the pion track is along the
beeline from the center point of CMS to the point
which the pion hit the ECAL. Suppose the start point
is the point which the pion hit the ECAL.

7. Data Sample Pi- sample: Eta: -1.479~1.479 Phi: -3.14~3.14
E = 20~200.0 GeV
Events:5000

8. The number of crystals which the pion track pass through

9. The End!
Backup

10. The distribution of the start point
t_start is the depth of the start point.

11. The formula to fit the hadron shower
Lateral:
Lognitudinal:
R1=6.21
dE/dt =E0b(bt)a-1e-bt/Γ(a)
a=0.67*log(E/Ec)-0.29
tmax=l.04*log(E/Ec)-0.16
b=(a-1)/tmax
E=24.83

13. The distribution of the deposit energy of 9x9 crystals

15. The distribution of the deposit energy of 9x9 crystals(from the fitting of the formula)

17. When nCrystal=1
The shower shape

18. When nCrystal=2
The shower shape