Post on 30-Dec-2015
description
STAR
Status of J/ Trigger Simulations for
d+Au Running
Trigger Board MeetingJan 23, 2003
MC & TU
STAR
L0 Topology trigger
Use not only high tower information but also topology information. Azimuth is divided into 6 trigger patches.
L0 performance for Tower > 1 GeV: background rejection factor: 40.6 Trigger efficiency: 50-60%
High tower here
Look here
Or here
Or here
STAR
L2 Energy Resolution with 3-tower cluster
Cluster 3 highest towers in a 3x3 patch
2 tower vs. 3 tower cluster: L2 Mass RMS changes from 668 to 311 MeV
<Ee - Ecl> = 40 MeVRMS = 248 MeV
Resolution ~ 17%/E
Conclusion: need clustering algorithm for L2optimum: 3 tower cluster
3 towercluster
no clustering single tower
3 tower cluster
STAR
Isolation Cuts: subtracting Tower or 3-Tower Cluster
3x3 patches,
what happens if we increase the patch size?
All BG towersPhotonsPionsKaonsKaonsProtons
i high towertowers
itowers
E E
E
electrons background
i clustertowers
itowers
E E
E
Most of the energy is in the cluster.
STAR
Isolation Cuts: 3x3, 5x5, 7x7…
Cut Eff. Electron clusters Rej. Background clusters
3x3 5x5 7x7 3x3 5x5 7x7
0.02 75% 60% 52% 41% 55% 62%
0.04 90% 77% 68% 24% 39% 46%
0.06 97% 86% 76% 15% 29% 36%
0.08 99% 89% 80% 10% 22% 29%
0.1 100% 92% 84% 6% 17% 24%
Integral3x3