li-measurementofthe-2009.pdf (2.89 MB)
Measurement of the inclusive ep scattering cross section at low Q 2 and x at HERA
journal contribution
posted on 2009-01-01, 00:00 authored by F D Aaron, C Alexa, V Andreev, B Antunovic, S Aplin, A Asmone, A Astvatsatourov, S Backovic, A Baghdasaryan, E Barrelet, W Bartel, K Begzsuren, O Behnke, O Behrendt, A Belousov, J C Bizot, V Boudry, I Bozovic-Jelisavcic, J Bracinik, G Brandt, M Brinkmann, V Brisson, D Bruncko, A Bunyatyan, G Buschhorn, L Bystritskaya, A J Campbell, K B Cantun Avila, F Cassol-Brunner, K Cerny, V Cerny, V Chekelian, A Cholewa, J G Contreras, J A Coughlan, G Cozzika, J Cvach, J B Dainton, K Daum, M Deák, Y De Boer, B Delcourt, M Del Degan, J Delvax, A De Roeck, E A De Wolf, C Diaconu, V Dodonov, A Dossanov, A Dubak, G Eckerlin, D Eckstein, V Efremenko, S Egli, A Eliseev, E Elsen, A Falkiewicz, P J W Faulkner, L Favart, A Fedotov, R Felst, J Feltesse, J Ferencei, D J Fischer, M Fleischer, A Fomenko, E Gabathuler, J Gayler, S Ghazaryan, A Glazov, I Glushkov, L Goerlich, N Gogitidze, M Gouzevitch, C Grab, T Greenshaw, B R Grell, G Grindhammer, S Habib, D Haidt, M Hansson, C Helebrant, R C W Henderson, E Hennekemper, H Henschel, M Herbst, G Herrera, M Hildebrandt, K H Hiller, D Hoffmann, R Horisberger, T Hreus, M Jacquet, M E Janssen, X Janssen, V Jemanov, L Jönsson, A W Jung, H Jung, M KapichineA measurement of the inclusive ep scattering cross section is presented in the region of low momentum transfers, 0.2∈GeV2 ≤Q 2≤12∈GeV2, and low Bjorken x, 5.10 -6x≤0.02. The result is based on two data sets collected in dedicated runs by the H1 Collaboration at HERA at beam energies of 27.6∈GeV and 920∈GeV for positrons and protons, respectively. A combination with data previously published by H1 leads to a cross section measurement of a few percent accuracy. A kinematic reconstruction method exploiting radiative ep events extends the measurement to lower Q 2 and larger x. The data are compared with theoretical models which apply to the transition region from photoproduction to deep inelastic scattering. © 2009 Springer-Verlag / Società Italiana di Fisica.
