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Tests of the Standard Theory of Electroweak Interactions by Christian Kiesling

By Christian Kiesling

During this textual content the writer provides a slightly whole account of the to be had experimental details on impartial present reactions as envisioned through the normal idea of electroweak interactions. the information, which variety from atomic parity violation to the invention of the W and Z bosons, impressively help the speculation as formulated through Glashow, Weinberg and Salam. The experimental info are significantly reviewed and with regards to the traditional conception, whose formal necessities are awarded in a clear approach. an entire compilation is given of precision measurements of the Weinberg perspective. distinctive realization is paid to excessive strength electron-positron experiments at PEP and PETRA resulting in the main specific price of the Weinberg attitude to this point made up of such experiments. newest effects from the high-statistics deep-inelastic neutrino scattering experiments were incorporated besides contemporary measurements of neutrino electron scattering, info and research for polarized-electron nucleon scattering, polarized-muon scattering, atomic parity violation and proton-antiproton experiments setting up the character of the intermediate bosons.

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E. the equality of the weak charges for the three generations of charged leptons, can be tested for the axial couplings with the help of the angular charge asymmetries. The total cross section, in principle, could offer a complementary test for the vector couplings. 5, when an uncertainty of 2 % is assumed for the cross section measurement at a typical energy of 35 GeV. d at PETRA/PEP energies. Thus the total cross section cannot be used as a test of this aspect of the standard theory either. On the other hand, any significant deviation from Rpp = 1 would signal deviations from QED and would therefore point towards new and unanticipated physics.

P [ GeV/c]. Outside the magnet a fine grain lead liquid argon calorimeter is installed consisting of an octagon ("barrel") surrounding the coil and forward/backward modules ("end caps"). The barrel is subdivided into 16 modules housed in a single cryogenic tank. The solid angle coverage of the barrel is 86% of 4~r. Each of the 16 modules samples the energy deposited by ionising particles in the liquid argon 19 times in depth. The charge is collected on lead strips of three different orientations amounting to a total of 20 radiation lengths (normal incidence).

Cosmic ray background is removed here by statistical subtraction, extrapolating experimental distributions of cosmic ray events which miss the interaction region. Other reactions, such as e+e - ~ e+e-#+/z - with both final state electrons undetected, or e+e - --* ~-+T- with both T's decaying into muons and neutrinos may contaminate the muon sample. P~estriction to high momentum particles, coplanar with the incoming beam, reduces these backgrounds to levels around and below 1 percent. The residual background which cannot be removed by experimental cuts is corrected for, usually by Monte-Carlo methods.

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