https://doi.org/10.1140/epjc/s10052-011-1579-4
Regular Article - Experimental Physics
Measurement of the inclusive e ± p scattering cross section at high inelasticity y and of the structure function F L
1
I. Physikalisches Institut der RWTH, Aachen, Germany
2
Vinca Institute of Nuclear Sciences, University of Belgrade, 1100, Belgrade, Serbia
3
School of Physics and Astronomy, University of Birmingham, Birmingham, UK
4
Inter-University Institute for High Energies ULB-VUB, Brussels, Belgium
5
Universiteit Antwerpen, Antwerpen, Belgium
6
National Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, Romania
7
Rutherford Appleton Laboratory, Chilton, Didcot, UK
8
Institute for Nuclear Physics, Cracow, Poland
9
Institut für Physik, TU Dortmund, Dortmund, Germany
10
Joint Institute for Nuclear Research, Dubna, Russia
11
CEA, DSM/Irfu, CE-Saclay, Gif-sur-Yvette, France
12
DESY, Hamburg, Germany
13
Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany
14
Max-Planck-Institut für Kernphysik, Heidelberg, Germany
15
Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany
16
Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany
17
Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic
18
Department of Physics, University of Lancaster, Lancaster, UK
19
Department of Physics, University of Liverpool, Liverpool, UK
20
Queen Mary and Westfield College, London, UK
21
Physics Department, University of Lund, Lund, Sweden
22
CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France
23
Departamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, Mexico
24
Departamento de Fisica, CINVESTAV IPN, México City, Mexico
25
Institute for Theoretical and Experimental Physics, Moscow, Russia
26
Lebedev Physical Institute, Moscow, Russia
27
Max-Planck-Institut für Physik, München, Germany
28
LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
29
LLR, Ecole Polytechnique, CNRS/IN2P3, Palaiseau, France
30
LPNHE, Université Pierre et Marie Curie Paris 6, Université Denis Diderot Paris 7, CNRS/IN2P3, Paris, France
31
Faculty of Science, University of Montenegro, Podgorica, Montenegro
32
Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
33
Faculty of Mathematics and Physics, Charles University, Praha, Czech Republic
34
Dipartimento di Fisica Università di Roma Tre and INFN Roma 3, Roma, Italy
35
Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
36
Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, Mongolia
37
Paul Scherrer Institut, Villigen, Switzerland
38
Fachbereich C, Universität Wuppertal, Wuppertal, Germany
39
Yerevan Physics Institute, Yerevan, Armenia
40
DESY, Zeuthen, Germany
41
Institut für Teilchenphysik, ETH, Zürich, Switzerland
42
Physik-Institut der Universität Zürich, Zürich, Switzerland
* e-mail: daum@mail.desy.de
Received:
20
December
2010
Revised:
21
January
2011
Published online:
10
March
2011
A measurement is presented of the inclusive neutral current e ± p scattering cross section using data collected by the H1 experiment at HERA during the years 2003 to 2007 with proton beam energies E p of 920, 575, and 460 GeV. The kinematic range of the measurement covers low absolute four-momentum transfers squared, 1.5 GeV2<Q 2<120 GeV2, small values of Bjorken x, 2.9⋅10−5<x<0.01, and extends to high inelasticity up to y=0.85. The structure function F L is measured by combining the new results with previously published H1 data at E p =920 GeV and E p =820 GeV. The new measurements are used to test several phenomenological and QCD models applicable in this low Q 2 and low x kinematic domain.
© Springer-Verlag / Società Italiana di Fisica, 2011
