1 Calice UK Analysis Meeting 23/1/07 David Ward

Cambridge data analysis work

David Ward

Main focus – data-MC comparisonsUsing “official” reconstructed filesUp to now restricted to ECAL data

2 Calice UK Analysis Meeting 23/1/07 David Ward

Linearity

“Official calibrations”Select events in central parts of wafers[-1,+2]s.d. Gaussian fit

3 Calice UK Analysis Meeting 23/1/07 David Ward

Linearity

Mostly within 1-2%, but several obvious problems and inconsistencies,

so plenty still to be done.

DESY MC – missing layers

4 Calice UK Analysis Meeting 23/1/07 David Ward

Resolution

Encouraging?

Line is just to guide the eye.We can see it corresponds roughly to

15%/√E+1%

5 Calice UK Analysis Meeting 23/1/07 David Ward

Hit energies

?

6 Calice UK Analysis Meeting 23/1/07 David Ward

Hit energies DESY Run 230137 (6 GeV)

Red – reconstructed with v0402Yellow - reconstructed with v0301

What happened??Calibration issue?

7 Calice UK Analysis Meeting 23/1/07 David Ward

Profiles

Longitudinal – data showersearlier than Monte Carlo.Upstream material? Tungsten properties?

Transverse – data seems broader than MC.Noise? Upstream material? Alignment?

8 Calice UK Analysis Meeting 23/1/07 David Ward

Energy in layer 1

1 GeV DESY

30 GeV CERN 40 GeV CERN

6 GeV DESY

9 Calice UK Analysis Meeting 23/1/07 David Ward

Depends on running conditions

20 GeV : Aug’06 20 GeV : Oct’06

10 Calice UK Analysis Meeting 23/1/07 David Ward

Depends on running conditions

20 GeV : Aug’06 20 GeV : Oct’06

11 Calice UK Analysis Meeting 23/1/07 David Ward

Beam profilesMC modelled as Gaussians 25m upstream. + crude trigger simulation. Not doing badly, but not right; could be affecting other comparisons.

12 Calice UK Analysis Meeting 23/1/07 David Ward

Energy across gaps

Dip in response across gaps.MC (red) gives bigger dip.

Width of gaps? Alignment in data?

13 Calice UK Analysis Meeting 23/1/07 David Ward

Alignment?Suggests beam tilted wrt ECAL in data (black) by about 10 mradMC (red) generated at normal incidence; detailed structure resulting from stagger doesn’t seem to be mirrored in data.

14 Calice UK Analysis Meeting 23/1/07 David Ward

Alignment study (Wenbiao)DESY data.Tracking in drift chambers using Michele’s code to predict position in each layer of ECALPlot <Xcog+Xfit> in each layer n.b. find anticorrelation between Xcog and Xfit. Hence + sign above. Also overall offset.Any evidence of misalignment?

15 Calice UK Analysis Meeting 23/1/07 David Ward

George Mavromanolakis

George is at Fermilab this year. Plans include the following:ECAL position resolution; inhomogeneity;

Moliere radius (using May’06 DESY data).ECAL calibration using muons (with Marcel

Reinhard)Monitoring for DHCAL slice test @ FNAL; also

for Japanese scintillator strip ECAL tests.Longer term - interested in

ECAL/HCAL/TCMT data analysis.