DESY 00-187 ISSN 0418-9833 December 2000 Measurement of Neutral and Charged Current Cross Sections in Electron-Proton Collisions at High Q

The inclusive e p single and double differential cross sections for neutral and charged current processes are measured with the H1 detector at HERA, in the range of four-momentum transfer squared Q between 150 and 30 000 GeV , and Bjorken x between 0:002 and 0:65. The data were taken in 1998 and 1999 with a centre-of-mass energy of 320 GeV and correspond to an integrated luminosity of 16.4 pb . The data are compared with recent measurements of the inclusive neutral and charged current e p cross sections. For clear evidence is observed for an asymmetry between e p and e p neutral current scattering and the generalised structure function x F 3 is extracted for the first time at HERA. A fit to the charged current data is used to extract a value for the W boson propagator mass. The data are found to be in good agreement with Standard Model predictions. To be submitted to Eur. Phys. J. C C. Adloff , V. Andreev , B. Andrieu , T. Anthonis , V. Arkadov , A. Astvatsatourov I. Ayyaz , A. Babaev , J. Bahr , P. Baranov , E. Barrelet , W. Bartel , U. Bassler P. Bate , A. Beglarian , O. Behnke , C. Beier , A. Belousov , T. Benisch , Ch. Berger G. Bernardi , T. Berndt , J.C. Bizot , V. Boudry , W. Braunschweig , V. Brisson B. Broker , D.P. Brown , W. Bruckner , P. Bruel , D. Bruncko , J. Burger , F.W. Busser A. Bunyatyan 12;34 , H. Burkhardt , A. Burrage , G. Buschhorn , A.J. Campbell , J. Cao T. Carli , S. Caron , E. Chabert , D. Clarke , B. Clerbaux , C. Collard , J.G. Contreras Y.R. Coppens , J.A. Coughlan , M.-C. Cousinou , B.E. Cox , G. Cozzika , J. Cvach , J.B. Dainton W.D. Dau , K. Daum 33;39 , M. Davidsson , B. Delcourt , N. Delerue , R. Demir..