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The Calculation of Atomic Collision Processes by Kenneth Smith

By Kenneth Smith

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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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