W. Riegler/CERN History of Instrumentation ↔ History of Particle Physics The ‘Real’ World of Particles Interaction of Particles with Matter Tracking Detectors,

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W. Riegler/CERN History of Instrumentation ↔ History of Particle Physics The ‘Real’ World of Particles Interaction of Particles with Matter Tracking Detectors, Calorimeters, Particle Identification Detector Systems Particle Detectors Summer Student Lectures 2008 Werner Riegler, CERN,

The ‘Real’ World of Particles Elektro-Weak Lagrangian Higgs Particle W. Riegler/CERN

The ‘Real’ World of Particles

W. Riegler/CERN

1.5V + _ e-e- E kin = 1.5eV = km/h Build your own Accelerator

E kin =mc 2  mc 2 (  -1)=mc 2   =2   =0.87 W. Riegler/CERN

ATLAS CMS LHCb ALICE W. Riegler/CERN

Z  e + e - Two high momentum charged particles depositing energy in the Electro Magnetic Calorimeter W. Riegler/CERN

Z  μ + μ - Two high momentum charged particles traversing all calorimeters and leaving a signal in the muon chambers. W. Riegler/CERN

Z  t + t -  m + n - e - n 1 or 2 secondary vertives, high momentum electron, high momentum muon, missing momentum. W. Riegler/CERN

Z  q q Two jets of particles W. Riegler/CERN

Z  q q g Three jets of particles W. Riegler/CERN

Two secondary vertices with characteristic decay particles giving invariant masses of known particles. Bubble chamber like – a single event tells what is happening. Negligible background. W. Riegler/CERN

ALEPH Higgs Candidate Undistinguishable background exists. Only statistical excess gives signature. W. Riegler/CERN

Cosmic Shower of Muons W. Riegler/CERN

Higgs Boson at CMS Particle seen as an excess of two photon events above the irreducible background. W. Riegler/CERN

Conclusion: Only a few of the numerous known particles have lifetimes that are long enough to leave tracks in a detector. Most of the particles are measured though the decay products and their kinematic relations (invariant mass). Most particles are only seen as an excess over an irreducible background. Some short lived particles (b,c –particles) reach lifetimes in the laboratory system that are sufficient to leave short tracks before decaying  identification by measurement of short tracks. In addition to this, detectors are built to measure the 8 particles Their difference in mass, charge and interaction is the key to their identification. W. Riegler/CERN