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

Institute of Applied Physics, University of Hamburg, Hamburg, Hamburg, Germany
European Physical Journal C (Impact Factor: 5.08). 05/2009; 61(2):223-235. DOI: 10.1140/epjc/s10052-009-1015-1


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 318 GeV. The total cross section is given for positively and negatively polarised electron beams. The differential cross-sections d
2, d
σ/dx and d
σ/dy are presented for Q
2>200 GeV2. The double-differential cross-section d
2 is presented in the kinematic range 280

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Available from: Iurii Sorokin
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    • "The cross sections of such processes are described in terms of the negative four–momentum transfer squared, Q 2 , the fraction of proton momentum carried by the struck quark, Bjorken x, and the inelasticity of the interaction, y, which are related according to the expression Q 2 = sxy. The first measurements of such processes to include the full HERA II (2003–2007) data are now available, and a selection of results from the H1 [1] [2] and ZEUS [4] [3] [5] [6] Collaborations is presented here. The HERA II data were taken with a polarised incident electron or positron beam of energy 27.6 GeV in collision with an unpolarised proton beam of energy 920 GeV, yielding a centre-ofmass energy of √ s = 319 GeV. "
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    ABSTRACT: New measurements of neutral and charged current cross sections at large negative four-momentum transfer squared Q^2 have been performed by H1 and ZEUS, using up to the complete HERA II ep data, which was taken with polarised electron and positron beams. The data are compared to predictions of the Standard Model, based on various parton distribution function parameterisations. The polarisation asymmetry of the neutral current interaction is measured as a function of Q^2, as well as the polarisation dependence of the charged current cross section and both are found to be in agreement with the Standard Model expectation. The HERA II cross sections are also combined with previously published HERA I data to obtain the most precise unpolarised measurements. Comment: 4 pages, 6 figures, to appear in the proceedings of Lake Louise Winter Institute 2010, Feb 15-20 2010 (version 2: corrected 3 typos)
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    • "Such measurements have been performed at the Tevatron, for both W → eν and W → µν events, by both the CDF [1] [2] and D0 [3] [4] collaborations and the data have been included in global fits of parton distributions [5] [6] [7]. The asymmetry is mainly sensitive to valence quark distributions [8], providing complementary information to that obtained from measurements of structure functions in deep inelastic scattering [9] [10] [11] [12] [13]. Predictions for the asymmetry exist up to next-to-next-to-leading order in the strong coupling [14]. "
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    ABSTRACT: The prospects for making a direct measurement of the W production charge asymmetry at the LHC are discussed. A modification to the method used at the Tevatron is proposed for measurements at the LHC. The expected sensitivity for such a measurement to parton distribution functions is compared to that for a measurement of the lepton charge asymmetry. The direct measurement approach is found to be less useful for placing constraints on parton distribution functions at the LHC than a measurement of the lepton charge asymmetry. KeywordsHadron-Hadron Scattering
    Preview · Article · May 2010 · Journal of High Energy Physics
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    ABSTRACT: Contribution to a conf. proceeding (book/online) Temporary entry (new)
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