Cornell University Unit Name

"Establishing a Particle Flow Algorithm with the SiD Calorimeter for the ILC"

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The goal of the R&D project is to develop a successful Particle Flow Algorithm with the SiD detector in mind. This is critical to (1) establish that the energy resolution of 30%/sqrt(E) can be achieved, and (2) determine the detector configuration which gives optimum performance.

Preliminary results on electromagnetic shower reconstruction and hadronic shower reconstruction were shown at Snowmass 2005. It was demonstrated that electromagnetic showers could be reconstructed with high efficiency at separations down to 3cm. A novel method of reconstructing hadronic showers by taking advantage of the patterns in their internal structure, categorized as (a) dense clumps, (b) track segments, (c) a halo of less dense hits, and (d) secondary neutral fragments, was presented.

The immediate goal is to bring the shower reconstruction algorithms to an acceptable level for use in a full PFA. This can then be used to optimize the detector design for landmark physics processes at the ILC. Further improvements will continue as the detailed understanding of the detector grows (especially the calorimeter response).

As far as resources are concerned, we are very short-handed and cannot maintain the necessary effort with our present level of support.

Presentations:

• Dissecting the Structure of Hadronic Clusters, Mat Charles, SiD CAL session, Aug 17, 2005

• Electromagnetic Showers with the MST Algorithm, SiD CAL session, Niels Meyer, Aug 17, 2005

• Dissecting the Structure of Hadronic Clusters, Mat Charles, PFA session, Aug 22, 2005

• Electromagnetic Showers with the MST Algorithm, PFA session, Niels Meyer, Aug 22, 2005

• Status of Particle Flow Studies, Mat Charles, SiD CAL meeting, Sep 21, 2005