Abstract
A prototype silicon–tungsten electromagnetic calorimeter (ECAL) for an international linear collider (ILC) detector was installed and tested during summer and autumn 2006 at CERN. The detector had 6480 silicon pads of dimension 1 × 1 cm 2 . Data were collected with electron beams in the energy range 6–45 GeV. The analysis described in this paper focuses on electromagnetic shower reconstruction and characterises the ECAL response to electrons in terms of energy resolution and linearity. The detector is linear to within approximately the 1% level and has a relative energy resolution of ( 16.53 ± 0.14 ( stat ) ± 0.4 ( syst ) ) / E ( GeV ) ⊕ ( 1.07 ± 0.07 ( stat ) ± 0.1 ( syst ) ) ( % ) . The spatial uniformity and the time stability of the ECAL are also addressed.
Highlights
The CALICE Collaboration is conducting R&D into calorimetric systems for the International Linear Collider (ILC) [1] — a proposed e+e− linear collider intended to operate at a centre of mass energy ranging up to the TeV scale
The subdetectors are simulated with different levels of detail, depending on their impact on the physics analysis: material simulation only for the Cerenkov detectors, raw energy depositions stored for the trigger counters, partial electronics simulation for the tracking detectors
In the case of the electromagnetic calorimeter (ECAL), the simulation gives the raw energy depositions in the Si pads and the readout electronics is simulated assuming that each channel exhibits only Gaussian noise
Summary
The CALICE Collaboration is conducting R&D into calorimetric systems for the ILC [1] — a proposed e+e− linear collider intended to operate at a centre of mass energy ranging up to the TeV scale. A promising way to achieve this increase in resolution is through designing a detector system optimised for the so called “particle flow” approach [2], which relies on the separate reconstruction of as many particles in the jet as possible, using the most suitable detector systems. The success of such an algorithm depends on the quality of the pattern recognition in the calorimeters.
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