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Figure 1: The CMS detector
Probing proton structure with the ZEUS experiment
The HERA collider in Hamburg is theworld’s largest electron microscope. Bycolliding high energy electrons andprotons, HERA can see deep inside theproton and resolve the richsubstructure consisting of quarks andgluons.
The ZEUS detector measuresthe particles produced inelectron-proton collisions,allowing the structure of theproton to be determined downto distances of 10-18 m or1/1000 of the size of theproton.
The HERA collider
The ZEUS experiment
Proton structureColliding electrons and protonsallows us to probe the structure ofthe proton at different distancescales. These results give theprobabilities for finding eachflavour of quark or a gluon insidethe proton and give new insightinto the strong force. At thesmallest distance scales theeffects of the heavy W and Zbosons can be observed, testingpredictions of the electroweakforce.
