You are now ready to take on the main task of this Masterclass: to rediscover the Z boson, using original data from the ATLAS experiment, collected in 2010. You will do this by carefully selecting the collisions where Z bosons have been produced and have decayed, and use the decay products to construct the mass of the Z boson. You will use your new knowledge of detecting particles together with some basic physics and learn that you have just mastered a powerful tool to "discover" new particles never seen in Nature before, such as the Z', a hypothetical big brother of the Z boson.

For the measurement, you will need the following tools:

1. An event display program: HYPATIA- Download starts here.
2. A Data sample - The data sample of 1000 events is divided into 20 smaller packages with 50 events each. Every package has a name from A to T and will be assigned to one group for processing. To load the package, start HYPATIA and download the assigned package. If you are in an International Masterclasses, this is already done for you. You will find the data sample in a folder on your computer desktop. If you don't, download your data sample by clicking on the assigned letter inside the picture below:
   
   
   
   
3. The tally sheet can be used to as a help-document to keep track of which events you have looked at, and what kind of events you believe you see. Download: ZIP
4. You will also need the invariant mass spreadsheet which you can get hold of here. Download: ODS XLS.

For a description of the actual exercise, go to the next page Analysis.

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