Example Events Containing a Hadron

Hadrons are particles that are made up of quarks, antiquarks and gluons. We can identify the signals produced by hadrons in the following way:

  1. The momentum of the observed charged particle track is usually larger than the energy observed where it strikes the electromagnetic calorimeter.
  2. There are no signals produced in the muon chambers.
  3. Sometimes, but not always, an energy deposit is visible in the hadronic calorimeter.
The signals produced by hadrons are, perhaps, less clear cut that those produced by electrons or muons. However, if you're uncertain just ask yourself the questions: Is this particle an electron? Is this particle an muon? If the answer is no to both of these questions then it's safe to assume it's a hadron!

Here are two example hadrons.

Example Hadron Number 1

End-On View of Event

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This hadron satisfies all three of the criteria given above. Please go through the three criteria one by one and verify this for yourself! Click here if you want some help with this.

Side View of Event

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Example Hadron Number 2

End-On View of Event

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Side View of Event

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This hadron satisfies only two of the three of the criteria given above. Make sure you understand which one does it not satisfy? Click here if you want some help with this.

Now you've understood the way we identify the tracks produced by the different types of particles, please:
(challenge) click here to proceed to the next part of the programme, which is "Challenge Part 1".

(challenge) Back to description of the Detector.

(home) Back to Home Page with table of contents.


Terry Wyatt. March 1997.