A.1 Derive an expression for the cyclotron radius, r, of the circular trajectory of an electron acted upon by a magnetic force perpendicular to its velocity, and express that radius as a function of its kinetic energy, K; charge modulus, e; mass, m; and magnetic field, B. Assume that the electron is a non-relativistic classical particle.
Given constants:
Where is the neutrino?
When two protons collide with a very high energy at the Large Hadron Collider (LHC), several particles may be produced as a result of that collision, such as electrons, muons, neutrinos, quarks, and their respective anti-particles. Most of these particles can be detected by the particle detector surrounding the collision point. For example, quarks undergo a process called hadronisation in which they become a shower of subatomic particles, called "jet". In addition, the high magnetic field present in the detectors allows even very energetic charged particles to curve enough for their momentum to be determined. The ATLAS detector uses a superconducting solenoid system that produces a constant and uniform 2.00 Tesla magnetic field in the inner part of the detector, surrounding the collision point. Charged particles with momenta below a certain value will be curved so strongly that they will loop repeatedly in the field and most likely not be measured. Due to its nature, the neutrino is not detected at all, as it escapes through the detector without interacting.
Data: Electron rest mass, m=9.11×10−31kg; Elementary charge, e=1.60×10−19C;
Speed of light, c=3.00×108ms−1; Vacuum permittivity, ϵ0=8.85×10−12Fm−1
Part A.ATLAS Detector physics