https://doi.org/10.1140/epjc/s10052-014-2915-2
Regular Article - Experimental Physics
Measurement of Feynman-
spectra of photons and neutrons in the very forward direction in deep-inelastic scattering at HERA
1
I. Physikalisches Institut der RWTH, Aachen, Germany
2
School of Physics and Astronomy, University of Birmingham, Birmingham, UK
3
Inter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerp, Belgium
4
National Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, Romania
5
Rutherford Appleton Laboratory, STFC, Didcot, Oxfordshire, UK
6
Institute for Nuclear Physics, Cracow, Poland
7
Institut für Physik, TU Dortmund, Dortmund, Germany
8
Joint Institute for Nuclear Research, Dubna, Russia
9
CEA, DSM/Irfu, CE-Saclay, Gif-sur-Yvette, France
10
DESY, Hamburg, Germany
11
Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany
12
Max-Planck-Institut für Kernphysik, Heidelberg, Germany
13
Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany
14
Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany
15
Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovak Republic
16
Department of Physics, University of Lancaster, Lancaster, UK
17
Department of Physics, University of Liverpool, Liverpool, UK
18
School of Physics and Astronomy, Queen Mary, University of London, London, UK
19
CPPM, Aix-Marseille Univ, CNRS/IN2P3, 13288 , Marseille, France
20
Departamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, Mexico
21
Institute for Theoretical and Experimental Physics, Moscow, Russia
22
Lebedev Physical Institute, Moscow, Russia
23
Max-Planck-Institut für Physik, Munich, Germany
24
LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
25
LLR, Ecole Polytechnique, CNRS/IN2P3, Palaiseau, France
26
Faculty of Science, University of Montenegro, Podgorica, Montenegro
27
Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
28
Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
29
Dipartimento di Fisica Università di Roma Tre and INFN Roma 3, Rome, Italy
30
Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
31
Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, Mongolia
32
Paul Scherrer Institut, Villigen, Switzerland
33
Fachbereich C, Universität Wuppertal, Wuppertal, Germany
34
Yerevan Physics Institute, Yerevan, Armenia
35
DESY, Zeuthen, Germany
36
Institut für Teilchenphysik, ETH, Zurich, Switzerland
37
Physik-Institut der Universität Zürich, Zurich, Switzerland
38
Department of Physics, Oxford University, Oxford, UK
* e-mail: daum@mail.desy.de
Received:
2
April
2014
Accepted:
19
May
2014
Published online:
24
June
2014
Measurements of normalised cross sections for the production of photons and neutrons at very small angles with respect to the proton beam direction in deep-inelastic 
scattering at HERA are presented as a function of the Feynman variable 
and of the centre-of-mass energy of the virtual photon-proton system 
. The data are taken with the H1 detector in the years 2006 and 2007 and correspond to an integrated luminosity of 
. The measurement is restricted to photons and neutrons in the pseudorapidity range 
and covers the range of negative four momentum transfer squared at the positron vertex 
GeV
, of inelasticity 
and of 
GeV. To test the Feynman scaling hypothesis the dependence of the dependent cross sections is investigated. Predictions of deep-inelastic scattering models and of models for hadronic interactions of high energy cosmic rays are compared to the measured cross sections.
© SIF and Springer-Verlag Berlin Heidelberg, 2014
