QuarkNet Classroom Projects

Catchin' Some Z's

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Abstract:

This project allows learners to access Monte Carlo particle physics data. The data represent calorimetry (energy) and tracking (momentum) information for decay products from interactions in an electron positron collider. We also provide test-beam data so that one can understand detector response prior to reducing the data. Learners can apply conservation of momentum and energy to data and determine the mass of a particle that the machine did not directly observe.

Introduction to Research:

Particle physicists typically work in huge collaborations on smaller portions of large experiment. This project models that in that there is too much for a single person to do. While the project does not attempt to emulate the design portion of the experiment, it realistically models the off-line data reduction and analysis. Group members can divide up the work; possible tasks include:

Test-beam and Callibration: use test-beam data to understand the response and resolution of the detector sub-systems.
Tracking: use the tracking data to determine the momentum of each particle.
Electromagnetic Calorimetry: use the energy sampled by the electromagnetic calorimeter to determin the energy of particles that interact in that region.
Hadronic Calorimetry: use the energy sampled by the hadronic calorimeter to determin the energy of particles that interact in that region.
Topology: use integrated data to determine the decay modes present in these events.

Learner Outcomes:

Learners will know and be able to:

Perform callibration studies.
Explore applications of the Conservation of Energy.
Explore applications of the Conservation of Momentum.
Make judgements on data that seem to contradict known conservation laws.
Draw interpret a number of plots.
Indirectly determine the mass of a "new" particle.

Research Questions:

Based upon their analysis of particle physics data learners will answer:

What is the response and resolution of the calorimeters in this detector?
What modes of decay are evident in the data?
What are the characteristics of any particles created in the electron-positron collision?

Product:

Learners will produce a report or presentation that answers the research questions. This report must contain supporting evidence derived from the data.