Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2005-12-22
Phys.Lett.B634:173-179,2006
Physics
High Energy Physics
High Energy Physics - Experiment
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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