General Overview:

This an sPHENIX module that implements the island algorithm (the 'IA' in 'RawClusterBuilderIA') as used by the CMS collaboration for clustering in the EMCal. The algorithm itself can be found in include/IslandAlgorithm.h.

Bugs discovered:

• [FIXED] Forgot to ensure that no double-counting of towers occurs. In other words, I found events containing two clusters that have one or more towers in common.

Initial Performance Checks (old):

(threshold seed energy set at 0.1 GeV).

Single Electron:

	Input	Output 1	Output 2	Output 3
Energy	20.	18.05	19.26	19.42
Eta	0.0	0.04	0.01	-0.01
Phi	0.0	-0.01	-0.01	-0.01

Single Photon:

	Input	Output 1	Output 2	Output 3
Energy	20.	17.39	15.54	17.39
Eta	0.0	-0.04	-0.01	-0.03
Phi	0.0	0.00	0.00	0.00

Single Pi0:

	Input	Output 1	Output 2	Output 3
Energy	20.	11.94	16.77	15.98
Eta	0.0	0.01	0.03	0.03
Phi	0.0	0.00	0.00	0.00