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Describe how to determine the radius of the circular motion of a charged particle in a magnetic fieldĪ charged particle experiences a force when moving through a magnetic field.Explain how a charged particle in an external magnetic field undergoes circular motion.
CHARGED PARTICLE FULL
CHARGED PARTICLE SOFTWARE
Similar to increasing the magnification of a microscope, in preparation for Run 2, the ATLAS event reconstruction software was optimized to better resolve these close-by particles. This effect is exacerbated by a higher charged-particle multiplicity in the decay, as clearly visible for the tau-lepton’s decay into five charged particles (green circles). At higher transverse momentum, merged measurements are more abundant and therefore the efficiency drops. Figure 2: Efficiency to reconstruct a track of a charged particle from decays of a tau-lepton, rho-meson and B0-hadron as a function of these particles initial transverse momentum. This would result in poor identification of long-lived b-hadrons and hadronic tau decays, and difficulties in calibrating the energy and mass of jets. Therefore, without careful consideration, this can limit the track reconstruction efficiency in these dense environments. This easily creates confusion within the algorithms responsible for reconstructing charged particle trajectories (tracks). In these very energetic jets, the average separation of charged particles is comparable to the size of individual inner detector elements. These energetic collisions are prime hunting grounds for signs of new physics, including massive, hypothetical new particles that would decay to much lighter – and therefore highly boosted – bosons. The ATLAS experiment now frequently observes highly collimated bundles of particles (known as jets) with energies of up to multiple TeV, as well as tau-leptons and b-hadrons that pass through the innermost detector layers before decaying. A new age of exploration dawned at the start of Run 2 of the Large Hadron Collider, as protons began colliding at the unprecedented centre-of-mass energy of 13 TeV.