An electron-positron collider runs with symmetric beam energies of E(e+) = E(e¯) = 102 GeV. At each orbit AE = 2.2 GeV has to be replaced for each beam particle by the accelerating units. The accelerator has 24 units available; each unit can replace an energy of AE = 100 MeV per orbit.
An electron-positron collider runs with symmetric beam energies of E(e^+) = E(e^−) = 102 GeV.
At each orbit ∆E = 2.2 GeV has to be replaced for each beam particle by the accelerating units.
The accelerator has 24 units available; each unit can replace an energy of ∆E = 100 MeV per
orbit.
a). The researchers want to create the Standard-Model Higgs boson but don’t know its mass
yet. Argue why the production rate via the direct process e +e− → H is negligible and name the process which can be used instead. Draw a Feynman diagram of this process. State the mechanism responsible for the energy loss and state how the energy loss per orbit scales with the beam energy.
b). Name two possible final states of this process and how they can be detected in a modern
particle detector, which consists of a tracker, an EM calorimeter, a hadronic calorimeter
and a muon system in radial direction. Calculate the maximum mass of the Higgs Boson, which the experiment can create
c). When no Higgs is found in the available mass range, the researches want to increase the
beam energy to access larger Higgs boson masses. Considering the limited number of
accelerator units, calculate the maximum energy they can reach and the maximum Higgs
mass they can discover this way.
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