Minerva and a Higgs-Hunting tutorial

Many of you may be aware of this already, but I thought you might find it fun! The software that’s used to produce the images you see on Higgs Hunters from the raw data from the Atlas experiment is called Atlantis. On the Atlantis website, there’s a section under “Master Classes” which should allow you to access Minerva, a tutorial guide that will help you recognise what type of particles are being produced in the images that you see. (Note that this all runs on Java, so you’ll need Java 5 or above for this to work.)

If you download Minerva, you’ll notice that the images they use look quite different to the ones presented to you on Higgs Hunters. Part of this is to do with the aesthetic changes made for the images on the website, but a more obvious change is the Fisheye transformation which we apply to the images before uploading them. This essentially magnifies the inner part of the detector, where you’ll find the OCVs, and shrinks the outer part of the detector – the calorimeters and the particle detectors. You can actually implement this yourself in the Java applet for Atlantis, select the Fisheye button:

fisheye

If you then set the parameter in the “Value” box to around 14, you’ll produce an image closer to those we see in Higgs Hunters.
Minerva gives you a series of events to classify and you should be able to check your answers on the internet – the events can be scrolled through using the arrow keys. The last few should contain Higgs boson events! Happy hunting!

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