GARLIC - GAmma Reconstruciton for the LInear Collider

The GARLIC algorithm is based on the REPLIC package. Its main idea is to make use of the typical shape of an electromagnetic shower. Due to its high density, a simple neighbour criterion is sufficient for clustering. In this way, noise hits as well as fluctuations in the extremities of the shower are suppressed and at the same time the two-particle separation is optimised. GARLIC has benn implemented in the MARLIN framework ([2]) and is adapted to the Si/W ECAL, both for the CALICE prototype as well as for the full detector model (LDC/ILD). To account for the differences in geometry, two versions of the algorithm exist. They are identical in terms of the actual clustering but adapted to the respective geometry. The main steps in the algorithm are: