Article

Measurement of charged current deep inelastic scattering cross sections with a longitudinally polarised electron beam at HERA

European Physical Journal C (Impact Factor: 5.44). 01/2009; 61(2):223-235. DOI: 10.1140/epjc/s10052-009-1015-1

ABSTRACT Measurements of the cross sections for charged current deep inelastic scattering in e

p collisions with longitudinally polarised electron beams are presented. The measurements are based on a data sample with an
integrated luminosity of 175 pb−1 collected with the ZEUS detector at HERA at a centre-of-mass energy of 318GeV. The total cross section is given for positively
and negatively polarised electron beams. The differential cross-sections d
σ/dQ
2, d
σ/dx and d
σ/dy are presented for Q
2>200 GeV2. The double-differential cross-section d
2
σ/dxdQ
2 is presented in the kinematic range 280<Q
2<30 000 GeV2 and 0.015<x<0.65. The measured cross sections are compared with the predictions of the Standard Model.

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    ABSTRACT: The ZEUS measurements of charged current deep inelastic scattering cross sections in e + p col- lisions with a longitudinally polarised positron beam are presented. The data sample used has an integrated luminosity of 132 pb 1 at a centre-of-mass energy of 318 GeV. The total cross sec- tion is presented at positive and negative values of the long itudinal polarisation of the positron beams. The single-differential cross-sections dσ/dQ 2 , dσ/dx and dσ/dy have been measured for Q 2 > 200 GeV 2 but are not presented here. The reduced cross-section ˜ σ is presented in the kinematic range 200 < Q 2 < 60 000 GeV 2 and 0.006 < x < 0.562. A lower limit on the mass of a hypothetical W boson which couples to right-handed particles has been determined.
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