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Llea N Samuel Advisor: Daniel Levin CALIBRATION CHAMBER ANALYSIS BENEDICT COLLEGE

Llea N Samuel Advisor: Daniel Levin CALIBRATION CHAMBER ANALYSIS BENEDICT COLLEGE. Why Muons?. An elementary particle with negative electric charge and a spin of 1/2. Mean lifetime:2.2μs, longer than any other unstable lepton, meson or baryon except for the neutron

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Llea N Samuel Advisor: Daniel Levin CALIBRATION CHAMBER ANALYSIS BENEDICT COLLEGE

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  1. Llea N Samuel Advisor: Daniel Levin CALIBRATION CHAMBER ANALYSIS BENEDICT COLLEGE

  2. Why Muons? • An elementary particle with negative electric charge and a spin of 1/2. • Mean lifetime:2.2μs, longer than any other unstable lepton, meson or baryon except for the neutron • Decay products from other particles that are of interest: H →Z Z*→ µ-µ+µ-µ+ • Can reconstruct a muon track to determine its momentum and therefore its invariant mass • Can use its invariant mass to determine the mass of the parent particle

  3. Barrel drift chambers • End cap chambers

  4. Multilayers

  5. Drift Tube Gold-plated Tungsten wire r = 25μm V= 3080 V Stretched by 350g of tension Gas Mixture: 93.0% Ar , 7% CO2 Pressure: 3 bar Aluminum tube: rinner= 1.46 cm router =1.5 cm

  6. Drift Tube Cross-section Muon Track Electrons drifting toward wire Aluminum tube Tungsten Wire

  7. Affecting Factors • Chemical: • Temperature • Pressure • Gas Mixture • Contaminants • Geometrical: • Tube/Wire • Position of Tube • Temperature • Wire Position in Tube: Wire Sag • Electronics: • Electronics Response

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