Single TT Algorithm

updated: 22-Oct-04

This algorithm would be included to reduce noise effects at low threshold. It is different than a sliding windows type algorithm in the following ways.

LM Separation: No separation between LMs is possible. Only single TTs over threshold are used.
Isolation Region: No EM isolation is included in the proposal below. Maybe it should be ?
EM Fraction: In the current proposal, the single HAD TT behind the EM TT in question is used to define EM fraction. Making a bigger HAD region would require more resources.

Steps of the algorithm are shown in the table below, using the same notation as in the ATLAS table.

Step Description Object Size SW Inputs

1 Add ICR 1 TT as needed

2 EM Frac
EM-TT > 2^b*HAD-TT 1x1 TTs: 2-5 x 2-5

6 Compare to Et thresh's 4x4 Objs: 2-5 x 2-5

7 Make Output Words EM: 2-5 x 2-5

Step	Description	Object Size	SW Inputs
1	Add ICR	1 TT	as needed
2	EM Frac EM-TT > 2^b*HAD-TT	1x1	TTs: 2-5 x 2-5
6	Compare to Et thresh's	4x4	Objs: 2-5 x 2-5
7	Make Output Words	EM: 2-5 x 2-5