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

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

2005-12-22

arxiv.org/abs/hep-ex/0512060v1

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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