Measurement of Charged Current Deep Inelastic Scattering Cross Sections 
     with a Longitudinally Polarised Positron Beam at HERA

                      ZEUS Collaboration

Measurements of the cross sections for charged current deep inelastic 
scattering in e+p collisions with a longitudinally polarised positron beam 
are presented. The measurements are based on a data sample with an 
integrated luminosity of 135.5 pb^-1 collected with the ZEUS detector at 
HERA in 2006 and 2007 at a centre-of-mass energy of 318 GeV. The total 
cross section is presented at positive and negative values of the 
longitudinal polarisation of the positron beams. The single-differential 
cross-sections dsigma/dQ^2, dsigma/dx and dsigma/dy are presented for 
Q^2>200 GeV. The double-differential cross-section d^2sigma/dxdQ^2 is 
presented in the kinematic range 280<Q^2<30000 GeV^2 and 0.0078<x<0.42. 
The measurements agree well with the predictions of the Standard Model.