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Measurement of single and double radiative low-Q2 Bhabha scattering at Ec.m.=29 GeV


The process e+e-e+e-(), where one electron scatters at a small angle, is studied with data from the Mark II detector at the SLAC storage ring PEP. The data are in excellent agreement with a Monte Carlo calculation and include a large contribution from order 4. The ratio of measured to calculated cross sections is R=0.9930.0170.015, where the first error is statistical and the second systematic. This is a sensitive test of the calculation of the dominant background for neutrino-counting experiments. © 1989 The American Physical Society.

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