CALICE resolution studies
Stewart Boogert

Luminosity spectrum measurement

Requires excellent angular resolution (< 10-3)

High energy particles (near beam energy)

High efficiency

Events in Endcap calorimeters

LC-ABD meeting non-pointing photons (8 mrad constant term)

Electron samples generated

5k events

Model :

TDR /D09M1

Polar region:

6 - 35 degrees / 10 -170 degrees

Energy

5 / 7.5 / 10 / 15 / 20 / 50 / 100 GeV

Flat angular distributions, from (0,0,0)

OpenPBS farm @ UCL!

Bhabha acollinearity

Two methods to reconstruct event energy, using different assumptions

Single photon radiation

Small angles

Luminosity spectrum

Bhabha event simulation (500k)

No detector effects yet...

Method assumptions break down

Low x

Energy resolution

LC-DET/2001-058

=0.03125

Resolution increases at high energy, leakage?

Calorimeter resolution

Stochastic ~14%

Constant ~4%

Not that far off TDR (11%, 1%)

Angular resolution

Polar resolution

Below 10-3 for endcap well before 175GeV

Difference between endcap and whole calorimeter, endcap more projective for these events

Scales as 1/E

Trying angular weighted cells

Future work

Angular resolution

Looks o.k for top studies

Lumi spectrum related

Improve angle reconstruction

CGA material maps

Implement more dead material?

Vertex position resolution

Include D09M1 data

Full Bhabha simulation

General calorimeter

Calibration

Leakage (HCAL?)

Clustering

OpenPBS

Move scripts to AFS

Run “physics” samples for clustering

Prototype samples for test beam

Stewart Boogert

2003-07-21T11:59:09