First Measurement of Charged Current Cross Sections at HERA with Longitudinally Polarised Positrons

Physics – High Energy Physics – High Energy Physics - Experiment

Scientific paper

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13 pages, 2 figures, 1 table

Scientific paper

10.1016/j.physletb.2006.01.054

Data taken with positrons of different longitudinal polarisation states in collision with unpolarised protons at HERA are used to measure the total cross sections of the charged current process, e^+ p \to \bar{\nu}X, for negative four-momentum transfer squared Q^2 > 400 GeV^2 and inelasticity y<0.9. Together with the corresponding cross section obtained from the previously published unpolarised data, the polarisation dependence of the charged current cross section is measured for the first time at high Q^2 and found to be in agreement with the Standard Model prediction.

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