, 2012:61,
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Date: 17 Sep 2012

Inclusive deep inelastic scattering at high Q 2 with longitudinally polarised lepton beams at HERA


Inclusive e ± p single and double differential cross sections for neutral and charged current deep inelastic scattering processes are measured with the H1 detector at HERA. The data were taken at a centre-of-mass energy of \( \sqrt {s} = {319} \) GeV with a total integrated luminosity of 333.7 pb−1 shared between two lepton beam charges and two longitudinal lepton polarisation modes. The differential cross sections are measured in the range of negative four-momentum transfer squared, Q 2, between 60 and 50 000 GeV2, and Bjorken x between 0.0008 and 0.65. The measurements are combined with earlier published unpolarised H1 data to improve statistical precision and used to determine the structure function \( xF_{3}^{{\gamma Z}} \) . Ameasurementoftheneutralcurrentparityviolating structure function \( F_{2}^{{\gamma Z}} \) is presented for the first time. The polarisation dependence of the charged current total cross section is also measured. The new measurements are well described by a next-to-leading order QCD fit based on all published H1 inclusive cross section data which are used to extract the parton distribution functions of the proton.

ARXIV EPRINT: 1206.7007
(a)Supported by the Bundesministerium für Bildung und Forschung, FRG, under contract numbers 05H09GUF, 05H09VHC, 05H09VHF, 05H16PEA. (D. Wegener, M. Dobre, A. Dossanov, R. Kogler, K. Nowak, F. Huber, H. Pirumov, M. Sauter, A. Schöning, E. Hennekemper, M. Herbst, K. Krüger, V. Lendermann, H.-C. Schultz-Coulon)
(b)Supported by the UK Science and Technology Facilities Council, and formerly by the UK Particle Physics and Astronomy Research Council. (J. Bracinik, I. R. Kenyon, P. R. Newman, P. D. Thompson, J. A. Coughlan, J. V. Morris, D. P. C. Sankey, R. C. W. Henderson, T. Sloan, J. B. Dainton, E. Gabathuler, T. Greenshaw, M. Klein, J. Kretzschmar, P. Laycock, S. J. Maxfield, A. Mehta, G. D. Patel, M. P. J. Landon, E. Rizvi, D. Traynor)
(c)Supported by FNRS-FWO-Vlaanderen, IISN-IIKW and IWT and by Interuniversity Attraction Poles Programme, Belgian Science Policy. (F. Ceccopieri, J. Delvax, E. A. De Wolf, L. Favart, T. Hreus, X. Janssen, H. Jung, R. Roosen, Z. Staykova, T. Sykora, P. Van Mechelen)
(d)Partially Supported by Polish Ministry of Science and Higher Education, grant DPN/N168/DESY/2009. (L. Goerlich, S. Mikocki, I. Milcewicz-Mika, G. Nowak, P. Sopicki, J. Turnau)
(e)Supported by VEGA SR grant no. 2/7062/27. (D. Bruncko, V. Cerny, J. Ferencei)
(f)Supported by the Swedish Natural Science Research Council. (L. Jönsson)
(g)Supported by the Ministry of Education of the Czech Republic under the projects LC527, INGO-LA09042 and MSM0021620859. (J. Cvach, J. Hladký, P. Reimer, J. Zálešák, K. Cerny, B. Pokorny, R. Polifka, D. Šálek, T. Sykora, A. Valkárová, J. Žáček, R. Žlebčík)
(h)Supported by the Swiss National Science Foundation. (C. Grab, K. Müller, P. Robmann, U. Straumann, P. Truöl)
(i)Supported by CONACYT, México, grant 48778-F. (K. B. Cantun Avila, J. G. Contreras, J. E. Ruiz Tabasco, G. Herrera, R. Lopez-Fernandez)
(j)Russian Foundation for Basic Research (RFBR), grant no 1329.2008.2 and Rosatom. (A. Bylinkin, L. Bystritskaya, A. Fedotov, V. Lubimov, A. Rostovtsev, A. Zhokin)
(k)Supported by the Romanian National Authority for Scientific Research under the contract PN 09370101. (F. D. Aaron, C. Alexa, M. Rotaru, G. Stoicea)
(l)Partially Supported by Ministry of Science of Montenegro, no. 05-1/3-3352. (S. Backovic, A. Dubak, G. Laštovička-Medin, I. Picuric, N. Raicevic)
(m)Supported by the Initiative and Networking Fund of the Helmholtz Association (HGF) under the contract VH-NG-401. (M. Dobre, K. Lipka)
(n)Absent on leave from NIPNE-HH, Bucharest, Romania (M. Dobre)