Viewing LCIO Event Data Using JAS3

The event data in LCIO files can be viewed using JAS3 with the LCSim Plugin and WIRED4. This tutorial will show you how to open an LCIO data file and browse through it using these tools.

Sample Data File

Download this sample ZPole Data File to your harddisk. This data file will be used throughout the example.

Loading the LCIO File

Open JAS3 by clicking on Start -> Programs -> JAS3 -> JAS3.

Browse to the data file by clicking on File -> Open, navigating to the directory where the file was saved, selecting the file, and pressing Enter.

JAS has changed a bit now that the LCIO file is loaded.

• The name of the file is shown in the select box.
• The JAS tree shows at the lefthand side of the screen with a folder called Datasets. The file is listed as a member of this folder.
• The record toolbar shows on the toolbar. This is used to step through records one-by-one or process all of the records in a file.
• The listing under File -> Recent Files shows the name of this file, for easy access in a later session.

This is the basic view for LCIO files.

LCSim Event Viewer

The LCSim Event Viewer shows event data from the collections in the LCIO file. Collections are sets of objects with the same type, such as CalorimeterHits, TrackerHits or MCParticles.

To open the browser, select View -> LCSim Event Browser.