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


talk Astroparticle Physics, Cosmology, Gravitation Astroparticle Physics, Cosmology, Gravitation


Collaboration H1 (DESY)


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))

Presentation materials