Content area
Abstract
A measurement of the inclusive ep scattering cross section is presented in the region of low momentum transfers, 0.2 GeV2 ≤Q2≤12 GeV2, and low Bjorken x, 5⋅10−6≤x≤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 Q2 and larger x. The data are compared with theoretical models which apply to the transition region from photoproduction to deep inelastic scattering.
Details
Title
Measurement of the inclusive ep scattering cross section at low Q2 and x at HERA
Author
Aaron, F. D. 1 ; Alexa, C. 1 ; Andreev, V. 2 ; Antunovic, B. 3 ; Aplin, S. 3 ; Asmone, A. 4 ; Astvatsatourov, A. 5 ; Backovic, S. 6 ; Baghdasaryan, A. 7 ; Barrelet, E. 8 ; Bartel, W. 3 ; Begzsuren, K. 9 ; Behnke, O. 10 ; Behrendt, O. 11 ; Belousov, A. 2 ; Bizot, J. C. 12 ; Boudry, V. 13 ; Bozovic-Jelisavcic, I. 14 ; Bracinik, J. 15 ; Brandt, G. 3 ; Brinkmann, M. 3 ; Brisson, V. 12 ; Bruncko, D. 16 ; Bunyatyan, A. 17 ; Buschhorn, G. 18 ; Bystritskaya, L. 19 ; Campbell, A. J. 3 ; Cantun Avila, K. B. 20 ; Cassol-Brunner, F. 21 ; Cerny, K. 22 ; Cerny, V. 16 ; Chekelian, V. 18 ; Cholewa, A. 3 ; Contreras, J. G. 20 ; Coughlan, J. A. 23 ; Cozzika, G. 24 ; Cvach, J. 25 ; Dainton, J. B. 26 ; Daum, K. 27 ; Deák, M. 3 ; de Boer, Y. 3 ; Delcourt, B. 12 ; Del Degan, M. 28 ; Delvax, J. 5 ; De Roeck, A. 3 ; De Wolf, E. A. 5 ; Diaconu, C. 21 ; Dodonov, V. 29 ; Dossanov, A. 18 ; Dubak, A. 6 ; Eckerlin, G. 3 ; Eckstein, D. 30 ; Efremenko, V. 19 ; Egli, S. 31 ; Eliseev, A. 2 ; Elsen, E. 3 ; Falkiewicz, A. 32 ; Faulkner, P. J. W. 15 ; Favart, L. 5 ; Fedotov, A. 19 ; Felst, R. 3 ; Feltesse, J. 24 ; Ferencei, J. 16 ; Fischer, D.-J. 3 ; Fleischer, M. 3 ; Fomenko, A. 2 ; Gabathuler, E. 26 ; Gayler, J. 3 ; Ghazaryan, S. 7 ; Glazov, A. 3 ; Glushkov, I. 30 ; Goerlich, L. 32 ; Gogitidze, N. 2 ; Gouzevitch, M. 13 ; Grab, C. 28 ; Greenshaw, T. 26 ; Grell, B. R. 3 ; Grindhammer, G. 18 ; Habib, S. 33 ; Haidt, D. 3 ; Hansson, M. 34 ; Helebrant, C. 3 ; Henderson, R. C. W. 35 ; Hennekemper, E. 36 ; Henschel, H. 30 ; Herbst, M. 36 ; Herrera, G. 37 ; Hildebrandt, M. 31 ; Hiller, K. H. 30 ; Hoffmann, D. 21 ; Horisberger, R. 31 ; Hreus, T. 5 ; Jacquet, M. 12 ; Janssen, M. E. 3 ; Janssen, X. 5 ; Jemanov, V. 33 ; Jönsson, L. 34 ; Jung, A. W. 36 ; Jung, H. 3 ; Kapichine, M. 38 ; Katzy, J. 3 ; Kenyon, I. R. 15 ; Kiesling, C. 18 ; Klein, M. 26 ; Kleinwort, C. 3 ; Kluge, T. 26 ; Knutsson, A. 3 ; Kogler, R. 18 ; Korbel, V. 3 ; Kostka, P. 30 ; Kraemer, M. 3 ; Krastev, K. 3 ; Kretzschmar, J. 26 ; Kropivnitskaya, A. 19 ; Krüger, K. 36 ; Kutak, K. 3 ; Landon, M. P. J. 39 ; Lange, W. 30 ; Laštovička-Medin, G. 6 ; Laycock, P. 26 ; Laštovička, T. 30 ; Lebedev, A. 2 ; Leibenguth, G. 28 ; Lendermann, V. 36 ; Levonian, S. 3 ; Li, G. 12 ; Lipka, K. 33 ; Liptaj, A. 18 ; List, B. 33 ; List, J. 3 ; Lobodzinska, E. 30 ; Loktionova, N. 2 ; Lopez-Fernandez, R. 37 ; Lubimov, V. 19 ; Lytkin, L. 29 ; Makankine, A. 38 ; Malinovski, E. 2 ; Marage, P. 5 ; Marti, Ll. 3 ; Martyn, H.-U. 40 ; Maxfield, S. J. 26 ; Mehta, A. 26 ; Meier, K. 36 ; Meyer, A. B. 3 ; Meyer, H. 3 ; Meyer, J. 3 ; Michels, V. 3 ; Mikocki, S. 32 ; Milcewicz-Mika, I. 32 ; Moreau, F. 13 ; Morozov, A. 38 ; Morris, J. V. 23 ; Mozer, M. U. 5 ; Mudrinic, M. 14 ; Müller, K. 41 ; Murín, P. 16 ; Naroska, B. 33 ; Naumann, Th. 30 ; Newman, P. R. 15 ; Niebuhr, C. 3 ; Nikiforov, A. 3 ; Nowak, G. 32 ; Nowak, K. 41 ; Nozicka, M. 3 ; Olivier, B. 18 ; Olsson, J. E. 3 ; Osman, S. 34 ; Ozerov, D. 19 ; Palichik, V. 38 ; Panagoulias, I. 3 ; Pandurovic, M. 14 ; Papadopoulou, Th. 3 ; Pascaud, C. 12 ; Patel, G. D. 26 ; Pejchal, O. 22 ; Perez, E. 24 ; Petrukhin, A. 19 ; Picuric, I. 6 ; Piec, S. 30 ; Pitzl, D. 3 ; Plačakytė, R. 3 ; Polifka, R. 22 ; Povh, B. 29 ; Preda, T. 1 ; Radescu, V. 3 ; Rahmat, A. J. 26 ; Raicevic, N. 6 ; Raspiareza, A. 18 ; Ravdandorj, T. 9 ; Reimer, P. 25 ; Rizvi, E. 39 ; Robmann, P. 41 ; Roland, B. 5 ; Roosen, R. 5 ; Rostovtsev, A. 19 ; Rotaru, M. 1 ; Ruiz Tabasco, J. E. 20 ; Rurikova, Z. 3 ; Rusakov, S. 2 ; Šálek, D. 22 ; Sankey, D. P. C. 23 ; Sauter, M. 28 ; Sauvan, E. 21 ; Schmitt, S. 3 ; Schmitz, C. 41 ; Schoeffel, L. 24 ; Schöning, A. 42 ; Schultz-Coulon, H.-C. 36 ; Sefkow, F. 3 ; Shaw-West, R. N. 15 ; Sheviakov, I. 2 ; Shtarkov, L. N. 2 ; Shushkevich, S. 18 ; Sloan, T. 35 ; Smiljanic, I. 14 ; Soloviev, Y. 2 ; Sopicki, P. 32 ; South, D. 11 ; Spaskov, V. 38 ; Specka, A. 13 ; Staykova, Z. 3 ; Steder, M. 3 ; Stella, B. 4 ; Stoicea, G. 1 ; Straumann, U. 41 ; Sunar, D. 5 ; Sykora, T. 5 ; Tchoulakov, V. 38 ; Thompson, G. 39 ; Thompson, P. D. 15 ; Toll, T. 3 ; Tomasz, F. 16 ; Tran, T. H. 12 ; Traynor, D. 39 ; Trinh, T. N. 21 ; Truöl, P. 41 ; Tsakov, I. 43 ; Tseepeldorj, B. 9 ; Turnau, J. 32 ; Urban, K. 36 ; Valkárová, A. 22 ; Vallée, C. 21 ; Van Mechelen, P. 5 ; Vargas Trevino, A. 3 ; Vazdik, Y. 2 ; Vinokurova, S. 3 ; Volchinski, V. 7 ; von den Driesch, M. 3 ; Wegener, D. 11 ; Wissing, Ch. 3 ; Wünsch, E. 3 ; Žáček, J. 22 ; Zálešák, J. 25 ; Zhang, Z. 12 ; Zhokin, A. 19 ; Zimmermann, T. 28 ; Zohrabyan, H. 7 ; Zomer, F. 12
1 National Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, Romania (GRID:grid.443874.8) (ISNI:0000 0000 9463 5349)
2 Lebedev Physical Institute, Moscow, Russia (GRID:grid.425806.d) (ISNI:0000 0001 0656 6476)
3 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000 0004 0492 0453)
4 Università di Roma Tre and INFN Roma 3, Dipartimento di Fisica, Roma, Italy (GRID:grid.8509.4) (ISNI:0000 0001 2162 2106)
5 Inter-University Institute for High Energies ULB-VUB, Brussels, Belgium (GRID:grid.4989.c) (ISNI:0000 0001 2348 6355); Universiteit Antwerpen, Antwerpen, Belgium (GRID:grid.5284.b) (ISNI:0000 0001 0790 3681)
6 University of Montenegro, Faculty of Science, Podgorica, Montenegro (GRID:grid.12316.37) (ISNI:0000 0001 2182 0188)
7 Yerevan Physics Institute, Yerevan, Armenia (GRID:grid.48507.3e) (ISNI:0000 0004 0482 7128)
8 Universités Paris VI and VII, IN2P3-CNRS, LPNHE, Paris, France (GRID:grid.4444.0) (ISNI:0000 0001 2259 7504)
9 Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, Mongolia (GRID:grid.450277.3)
10 Universität Heidelberg, Physikalisches Institut, Heidelberg, Germany (GRID:grid.7700.0) (ISNI:0000 0001 2190 4373)
11 TU Dortmund, Institut für Physik, Dortmund, Germany (GRID:grid.5675.1) (ISNI:0000 0001 0416 9637)
12 Univ Paris-Sud, CNRS/IN2P3, LAL, Orsay, France (GRID:grid.4444.0) (ISNI:0000 0001 2259 7504)
13 Ecole Polytechnique, IN2P3-CNRS, LLR, Palaiseau, France (GRID:grid.4444.0) (ISNI:0000 0001 2259 7504)
14 Vinca Institute of Nuclear Sciences, Belgrade, Serbia (GRID:grid.7149.b) (ISNI:0000 0001 2166 9385)
15 University of Birmingham, School of Physics and Astronomy, Birmingham, UK (GRID:grid.6572.6) (ISNI:0000 0004 1936 7486)
16 Slovak Academy of Sciences, Institute of Experimental Physics, Košice, Slovak Republic (GRID:grid.419303.c) (ISNI:0000 0001 2180 9405)
17 Max-Planck-Institut für Kernphysik, Heidelberg, Germany (GRID:grid.419604.e) (ISNI:0000 0001 2288 6103); Yerevan Physics Institute, Yerevan, Armenia (GRID:grid.48507.3e) (ISNI:0000 0004 0482 7128)
18 Max-Planck-Institut für Physik, München, Germany (GRID:grid.435824.c) (ISNI:0000 0001 2375 0603)
19 Institute for Theoretical and Experimental Physics, Moscow, Russia (GRID:grid.21626.31) (ISNI:0000 0001 0125 8159)
20 CINVESTAV, Departamento de Fisica Aplicada, Mérida, México (GRID:grid.418275.d) (ISNI:0000 0001 2165 8782)
21 Univ. Mediterranee, CPPM, CNRS/IN2P3, Marseille, France (GRID:grid.5399.6) (ISNI:0000 0001 2176 4817)
22 Charles University, Faculty of Mathematics and Physics, Praha, Czech Republic (GRID:grid.4491.8) (ISNI:0000 0004 1937 116X)
23 Rutherford Appleton Laboratory, Chilton, UK (GRID:grid.76978.37) (ISNI:0000 0001 2296 6998)
24 CE-Saclay, CEA, DSM/Irfu, Gif-sur-Yvette, France (GRID:grid.457334.2)
25 Academy of Sciences of the Czech Republic, Institute of Physics, Praha, Czech Republic (GRID:grid.418095.1) (ISNI:0000 0001 1015 3316)
26 University of Liverpool, Department of Physics, Liverpool, UK (GRID:grid.10025.36) (ISNI:0000 0004 1936 8470)
27 Universität Wuppertal, Fachbereich C, Wuppertal, Germany (GRID:grid.7787.f) (ISNI:0000 0001 2364 5811)
28 ETH, Institut für Teilchenphysik, Zürich, Switzerland (GRID:grid.5801.c) (ISNI:0000 0001 2156 2780)
29 Max-Planck-Institut für Kernphysik, Heidelberg, Germany (GRID:grid.419604.e) (ISNI:0000 0001 2288 6103)
30 DESY, Zeuthen, Germany (GRID:grid.7683.a) (ISNI:0000 0004 0492 0453)
31 Paul Scherrer Institut, Villigen, Switzerland (GRID:grid.5991.4) (ISNI:0000 0001 1090 7501)
32 Institute for Nuclear Physics, Cracow, Poland (GRID:grid.418860.3) (ISNI:0000 0001 0942 8941)
33 Universität Hamburg, Institut für Experimentalphysik, Hamburg, Germany (GRID:grid.9026.d) (ISNI:0000 0001 2287 2617)
34 University of Lund, Physics Department, Lund, Sweden (GRID:grid.4514.4) (ISNI:0000 0001 0930 2361)
35 University of Lancaster, Department of Physics, Lancaster, UK (GRID:grid.9835.7) (ISNI:0000 0000 8190 6402)
36 Universität Heidelberg, Kirchhoff-Institut für Physik, Heidelberg, Germany (GRID:grid.7700.0) (ISNI:0000 0001 2190 4373)
37 CINVESTAV, Departamento de Fisica, Mérida, México (GRID:grid.418275.d) (ISNI:0000 0001 2165 8782)
38 Joint Institute for Nuclear Research, Dubna, Russia (GRID:grid.33762.33) (ISNI:0000 0004 0620 4119)
39 Queen Mary and Westfield College, London, UK (GRID:grid.4868.2) (ISNI:0000 0001 2171 1133)
40 I. Physikalisches Institut der RWTH, Aachen, Germany (GRID:grid.1957.a) (ISNI:0000 0001 0728 696X)
41 Physik-Institut der Universität Zürich, Zürich, Switzerland (GRID:grid.7400.3) (ISNI:0000 0004 1937 0650)
42 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000 0004 0492 0453); Physik-Institut der Universität Zürich, Zürich, Switzerland (GRID:grid.7400.3) (ISNI:0000 0004 1937 0650)
43 Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria (GRID:grid.425050.6) (ISNI:0000 0004 0519 4756)
1 National Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, Romania (GRID:grid.443874.8) (ISNI:0000 0000 9463 5349)
2 Lebedev Physical Institute, Moscow, Russia (GRID:grid.425806.d) (ISNI:0000 0001 0656 6476)
3 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000 0004 0492 0453)
4 Università di Roma Tre and INFN Roma 3, Dipartimento di Fisica, Roma, Italy (GRID:grid.8509.4) (ISNI:0000 0001 2162 2106)
5 Inter-University Institute for High Energies ULB-VUB, Brussels, Belgium (GRID:grid.4989.c) (ISNI:0000 0001 2348 6355); Universiteit Antwerpen, Antwerpen, Belgium (GRID:grid.5284.b) (ISNI:0000 0001 0790 3681)
6 University of Montenegro, Faculty of Science, Podgorica, Montenegro (GRID:grid.12316.37) (ISNI:0000 0001 2182 0188)
7 Yerevan Physics Institute, Yerevan, Armenia (GRID:grid.48507.3e) (ISNI:0000 0004 0482 7128)
8 Universités Paris VI and VII, IN2P3-CNRS, LPNHE, Paris, France (GRID:grid.4444.0) (ISNI:0000 0001 2259 7504)
9 Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, Mongolia (GRID:grid.450277.3)
10 Universität Heidelberg, Physikalisches Institut, Heidelberg, Germany (GRID:grid.7700.0) (ISNI:0000 0001 2190 4373)
11 TU Dortmund, Institut für Physik, Dortmund, Germany (GRID:grid.5675.1) (ISNI:0000 0001 0416 9637)
12 Univ Paris-Sud, CNRS/IN2P3, LAL, Orsay, France (GRID:grid.4444.0) (ISNI:0000 0001 2259 7504)
13 Ecole Polytechnique, IN2P3-CNRS, LLR, Palaiseau, France (GRID:grid.4444.0) (ISNI:0000 0001 2259 7504)
14 Vinca Institute of Nuclear Sciences, Belgrade, Serbia (GRID:grid.7149.b) (ISNI:0000 0001 2166 9385)
15 University of Birmingham, School of Physics and Astronomy, Birmingham, UK (GRID:grid.6572.6) (ISNI:0000 0004 1936 7486)
16 Slovak Academy of Sciences, Institute of Experimental Physics, Košice, Slovak Republic (GRID:grid.419303.c) (ISNI:0000 0001 2180 9405)
17 Max-Planck-Institut für Kernphysik, Heidelberg, Germany (GRID:grid.419604.e) (ISNI:0000 0001 2288 6103); Yerevan Physics Institute, Yerevan, Armenia (GRID:grid.48507.3e) (ISNI:0000 0004 0482 7128)
18 Max-Planck-Institut für Physik, München, Germany (GRID:grid.435824.c) (ISNI:0000 0001 2375 0603)
19 Institute for Theoretical and Experimental Physics, Moscow, Russia (GRID:grid.21626.31) (ISNI:0000 0001 0125 8159)
20 CINVESTAV, Departamento de Fisica Aplicada, Mérida, México (GRID:grid.418275.d) (ISNI:0000 0001 2165 8782)
21 Univ. Mediterranee, CPPM, CNRS/IN2P3, Marseille, France (GRID:grid.5399.6) (ISNI:0000 0001 2176 4817)
22 Charles University, Faculty of Mathematics and Physics, Praha, Czech Republic (GRID:grid.4491.8) (ISNI:0000 0004 1937 116X)
23 Rutherford Appleton Laboratory, Chilton, UK (GRID:grid.76978.37) (ISNI:0000 0001 2296 6998)
24 CE-Saclay, CEA, DSM/Irfu, Gif-sur-Yvette, France (GRID:grid.457334.2)
25 Academy of Sciences of the Czech Republic, Institute of Physics, Praha, Czech Republic (GRID:grid.418095.1) (ISNI:0000 0001 1015 3316)
26 University of Liverpool, Department of Physics, Liverpool, UK (GRID:grid.10025.36) (ISNI:0000 0004 1936 8470)
27 Universität Wuppertal, Fachbereich C, Wuppertal, Germany (GRID:grid.7787.f) (ISNI:0000 0001 2364 5811)
28 ETH, Institut für Teilchenphysik, Zürich, Switzerland (GRID:grid.5801.c) (ISNI:0000 0001 2156 2780)
29 Max-Planck-Institut für Kernphysik, Heidelberg, Germany (GRID:grid.419604.e) (ISNI:0000 0001 2288 6103)
30 DESY, Zeuthen, Germany (GRID:grid.7683.a) (ISNI:0000 0004 0492 0453)
31 Paul Scherrer Institut, Villigen, Switzerland (GRID:grid.5991.4) (ISNI:0000 0001 1090 7501)
32 Institute for Nuclear Physics, Cracow, Poland (GRID:grid.418860.3) (ISNI:0000 0001 0942 8941)
33 Universität Hamburg, Institut für Experimentalphysik, Hamburg, Germany (GRID:grid.9026.d) (ISNI:0000 0001 2287 2617)
34 University of Lund, Physics Department, Lund, Sweden (GRID:grid.4514.4) (ISNI:0000 0001 0930 2361)
35 University of Lancaster, Department of Physics, Lancaster, UK (GRID:grid.9835.7) (ISNI:0000 0000 8190 6402)
36 Universität Heidelberg, Kirchhoff-Institut für Physik, Heidelberg, Germany (GRID:grid.7700.0) (ISNI:0000 0001 2190 4373)
37 CINVESTAV, Departamento de Fisica, Mérida, México (GRID:grid.418275.d) (ISNI:0000 0001 2165 8782)
38 Joint Institute for Nuclear Research, Dubna, Russia (GRID:grid.33762.33) (ISNI:0000 0004 0620 4119)
39 Queen Mary and Westfield College, London, UK (GRID:grid.4868.2) (ISNI:0000 0001 2171 1133)
40 I. Physikalisches Institut der RWTH, Aachen, Germany (GRID:grid.1957.a) (ISNI:0000 0001 0728 696X)
41 Physik-Institut der Universität Zürich, Zürich, Switzerland (GRID:grid.7400.3) (ISNI:0000 0004 1937 0650)
42 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000 0004 0492 0453); Physik-Institut der Universität Zürich, Zürich, Switzerland (GRID:grid.7400.3) (ISNI:0000 0004 1937 0650)
43 Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria (GRID:grid.425050.6) (ISNI:0000 0004 0519 4756)
Pages
625
Publication year
2009
Publication date
Oct 2009
ISSN
14346044
e-ISSN
14346052
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2294052600
Copyright
© Springer-Verlag / Società Italiana di Fisica 2009.