# EPS HEP 2015

22-29 July 2015
Europe/Vienna timezone

## Measurement of Feynman-x Spectra of Photons and Neutrons in the Very Forward Direction in Deep-Inelastic Scattering at HERA

Jul 23, 2015, 10:00 AM
15m
HS33

### HS33

talk Astroparticle Physics, Cosmology, Gravitation

### Speaker

Collaboration H1 (DESY)

### Description

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 ep scattering at HERA are presented as a function of the Feynman variable $x_F$ and of the centre-of-mass energy of the virtual photon-proton system $W$. The data are taken with the H1 detector in the years 2006 and 2007 and correspond to an integrated luminosity of 131 pb$^{−1}$. The measurement is restricted to photons and neutrons in the pseudorapidity range $\eta > 7.9$ and covers the range of negative four momentum transfer squared at the positron vertex $6< Q^2< 100$ GeV², of inelasticity $0.05< y< 0.6$ and of $70< W< 245$ GeV. To test the Feynman scaling hypothesis the $W$ dependence of the $x_F$ 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.

### additional information

Eur. Phys. J. C74 (2014) 2915 [arxiv:1404.0201]

### Primary authors

Collaboration H1 (DESY) Karin Daum (Wuppertal, U./Desy) Stefan Schmitt (Deutsches Elektronen-Synchrotron (DE))