Collider Detector at Fermilab

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The Collider Detector at Fermilab , just CDF is an experiment in particle physics at the proton - antiproton - storage ring Tevatron of Fermi National Accelerator laboratorys . The CDF experiment is operated by an international collaboration in which around 600 physicists from 60 universities and national research institutions from 13 countries have come together.

history

The experiment was proposed in August 1981 and approved on April 1 of the following year. The first data that led to the publication of measurement results were recorded in 1987. Since then, the CDF has been modified several times in order to adapt the experiment to ever higher beam intensities.

Research goals

The aim of the CDF experiment is to study the production and decay of heavy elementary particles such as Top - Bottom - and charm quarks and the electroweak gauge bosons W and Z . CDF is also investigating the production of high-energy photons and particle jets . In addition, the CDF collaboration is looking for signatures of so-called new physics, i. H. for new particles and phenomena that cannot be explained by the standard model of particle physics .

Structure of the experiment

CDF is a universal detector for recording high-energy collisions of protons and antiprotons. The central part of the detector has a size of about 12 by 12 by 12 meters.

The detector is built up radially symmetrically around the beam pipe in which the particle collisions take place. Closest to the beam pipe is a system of silicon stripe detectors , which is used to locate the primary vertex ; H. the location of the proton-antiproton collision, and secondary vertices, d. H. have the locations of decay of long-lived particles measured precisely. Next up is a drift chamber , which can be used to track charged particle traces over a large volume. By curving the tracks of charged particles in a strong magnetic field of 1.4 Tesla , the impulses of these particles can be determined. The magnetic field is generated by a 4.8 m long superconducting magnet coil with a radius of 1.5 m. Outside the magnetic coil there are so-called electromagnetic and hadronic calorimeters , in which electromagnetically interacting particles ( electrons and photons ) and hadrons are stopped and their energies are measured. Outside the calorimeter there are drift chambers for detecting muons .

The data acquisition is controlled by a data acquisition trigger system, which analyzes 1.7 million proton-antiproton collisions per second in real time and selects around 100 collision events from the data stream for later detailed analysis.

Main results

The most important results of the CDF experiment include the discovery of the top quark (at the same time as the D0 experiment ) and the measurement of its properties, as well as the measurement of the matter-antimatter oscillation frequency of the B s mesons .

Individual evidence

  1. ↑ List of authors of the CDF collaboration
  2. FNAL-E-0741 experiment. FNAL, archived from the original on September 27, 2007 ; accessed on June 21, 2016 (The CDF detector in the SPIRES database).
  3. CDF Collaboration (F. Abe et al.): Observation of top quark production in anti-p p collisions in Phys. Ref. Lett. 75, 1995, 2626-2631 hep-ex / 9503002
  4. CDF Collaboration (A. Abulencia et al.): Observation of B 0 s anti-B 0 s Oscillations in Phys. Ref. Lett. 97, 2006, 242003 hep-ex / 0609040

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