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First measurement of charged current cross sections at HERA with longitudinally polarised positrons

par Aktas, Adil;Favart, Laurent ;Janssen, Xavier ;Marage, Pierre ; [et al.]
Référence Physics letters. Section B, 634, 2-3, page (173-179)
Publication Publié, 2006

Article révisé par les pairs

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Résumé :

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→νX, for negative four-momentum transfer squared Q2>400 GeV2 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. © 2006 Elsevier B.V. All rights reserved.