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ATLAS Muon Spectrometer Calibrations

ATLAS Muon Spectrometer Calibrations. Jason Hindes Dan Levin . Muon Spectrometer: Why? . Answer 1: Muons are weakly interacting: Answer 2: One Visible signal is H->2Z-> 4l the cleanest is 4 μ (lowest background). What we need: muon energy and momentum. How?.

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ATLAS Muon Spectrometer Calibrations

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  1. ATLAS Muon Spectrometer Calibrations Jason Hindes Dan Levin

  2. Muon Spectrometer: Why? • Answer 1: Muons are weakly interacting: • Answer 2: One Visible signal is H->2Z-> 4l the cleanest is 4 μ (lowest background). • What we need: muon energy and momentum

  3. How? • JJ Thompsommeasurement of e/m by bending electrons in a magnetic field. • More complicated, but same principle: Curved path is function of momentum • If we can measure the curvature, we can measure the momentum.

  4. The Story: Drift Tubes and RTs Drift Tubes permeate the entire spectrometer. Design: 1-6m length, high voltage anode wire, grounded aluminum outer wall, and gas (93Ar 7CO2) Our Stop Watch: External Trigger, Time of Pulse RT from some autocalibration procedure converts drift times into drift radii. Connect the drift radii from different tubes to determine track.

  5. Current Work • Autocalibration procedure that we like to use outputs RTs under standard conditions • Correct this function for local chamber conditions: temperature, B-Field, wire sag • Without corrections, determination of a muon’s track can’t be accurately determined => 7kiloton piece of junk. • How we solve this is pretty cool, but I’ll tell you about it next time!

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