/ hep-ex DESY-14-035

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

Andreev, V. (Lebedev Inst.) ; Baghdasaryan, A. (Yerevan Phys. Inst.) ; Begzsuren, K. (Ulan Bator, Inst. Phys. Tech.) ; Belousov, A. (Lebedev Inst.) ; Belov, P. (DESY) ; Boudry, V. (Ecole Polytechnique) ; Brandt, G. (Liverpool U.) ; Brinkmann, M. (DESY) ; Brisson, V. (Orsay) ; Britzger, D. (DESY) ; Buniatyan, A. (Heidelberg U.) ; Bylinkin, A. (Moscow, MIPT) ; Bystritskaya, L. (Moscow, ITEP) ; Campbell, A.J. (DESY) ; Cantun Avila, K.B. (Merida, IPN) ; Ceccopieri, F. (Antwerp U., WISINF) ; Cerny, K. (Charles U.) ; Chekelian, V. (Munich, Max Planck Inst.) ; Contreras, J.G. (Merida, IPN) ; Dainton, J.B. (Liverpool U.) ; Daum, K. (Wuppertal U.) ; Diaconu, C. (Marseille, CPPM) ; Dobre, M. (Bucharest, IFIN-HH) ; Dodonov, V. (DESY) ; Dossanov, A. (Munich, Max Planck Inst.) ; Eckerlin, G. (DESY) ; Egli, S. (PSI, Villigen) ; Elsen, E. (DESY) ; Favart, L. (Antwerp U., WISINF) ; Fedotov, A. (Moscow, ITEP) ; Feltesse, J. (DAPNIA, Saclay) ; Ferencei, J. (Kosice, IEF) ; Fleischer, M. (DESY) ; Fomenko, A. (Lebedev Inst.) ; Gabathuler, E. (Liverpool U.) ; Gayler, J. (DESY) ; Ghazaryan, S. (DESY) ; Glazov, A. (DESY) ; Goerlich, L. (Cracow, INP) ; Gogitidze, N. (Lebedev Inst.) ; Gouzevitch, M. (Lyon, IPN) ; Grab, C. (Zurich, ETH) ; Grebenyuk, A. (Antwerp U., WISINF) ; Greenshaw, T. (Liverpool U.) ; Grindhammer, G. (Munich, Max Planck Inst.) ; Haidt, D. (DESY) ; Henderson, R.C.W. (Lancaster U.) ; Herbst, M. (Heidelberg U.) ; Hladky, J. (Prague, Inst. Phys.) ; Hoffmann, D. (Marseille, CPPM) ; Horisberger, R. (PSI, Villigen) ; Hreus, T. (Antwerp U., WISINF) ; Huber, F. (Heidelberg U.) ; Jacquet, M. (Orsay) ; Janssen, X. (Antwerp U., WISINF) ; Jung, H. (Antwerp U., WISINF) ; Kapichine, M. (Dubna, JINR) ; Kiesling, C. (Munich, Max Planck Inst.) ; Klein, M. (Liverpool U.) ; Kleinwort, C. (DESY) ; Kogler, R. (Hamburg U., Inst. Exp. Phys. II) ; Kostka, P. (DESY) ; Kretzschmar, J. (Liverpool U.) ; Kruger, K. (DESY) ; Landon, M.P.J. (Queen Mary, U. of London) ; Lange, W. (DESY) ; Laycock, P. (Liverpool U.) ; Lebedev, A. (Lebedev Inst.) ; Levonian, S. (DESY) ; Lipka, K. (Tennessee U.) ; List, B. (DESY) ; List, J. (DESY) ; Lobodzinski, B. (DESY) ; Lytkin, L. (Dubna, JINR) ; Malinovski, E. (Lebedev Inst.) ; Martyn, H.U. (Aachen, Tech. Hochsch.) ; Maxfield, S.J. (Liverpool U.) ; Mehta, A. (Liverpool U.) ; Meyer, A.B. (DESY) ; Meyer, H. (Wuppertal U., Dept. Math.) ; Meyer, J. (DESY) ; Mikocki, S. (Cracow, INP) ; Morozov, A. (Dubna, JINR) ; Muller, K. (Zurich U.) ; Naumann, Th. (DESY) ; Newman, P.R. (Birmingham U.) ; Niebuhr, C. (DESY) ; Nowak, G. (Cracow, INP) ; Nowak, K. (Hamburg U., Inst. Exp. Phys. II) ; Olsson, J.E. (DESY) ; Ozerov, D. (DESY) ; Pahl, P. (DESY) ; Pascaud, C. (Orsay) ; Patel, G.D. (Liverpool U.) ; Perez, E. (CERN) ; Petrukhin, A. (DESY) ; Picuric, I. (Montenegro U.) ; Pirumov, H. (DESY) ; Pitzl, D. (DESY) ; Placakyte, R. (Tennessee U.) ; Pokorny, B. (Charles U.) ; Polifka, R. (Toronto U.) ; Povh, B. (Heidelberg, Max Planck Inst.) ; Radescu, V. (Tennessee U.) ; Raicevic, N. (Montenegro U.) ; Ravdandorj, T. (Ulan Bator, Inst. Phys. Tech.) ; Reimer, P. (Prague, Inst. Phys.) ; Rizvi, E. (Queen Mary, U. of London) ; Robmann, P. (Zurich U.) ; Roosen, R. (Antwerp U., WISINF) ; Rostovtsev, A. (Moscow, ITEP) ; Rotaru, M. (Bucharest, IFIN-HH) ; Rusakov, S. (Lebedev Inst.) ; Salek, D. (Charles U.) ; Sankey, D.P.C. (Rutherford) ; Sauter, M. (Heidelberg U.) ; Sauvan, E. (Annecy, LAPP) ; Schmitt, S. (DESY) ; Schoeffel, L. (DAPNIA, Saclay) ; Schoning, A. (Heidelberg U.) ; Schultz-Coulon, H.C. (Heidelberg U.) ; Sefkow, F. (DESY) ; Shushkevich, S. (DESY) ; Soloviev, Y. (Lebedev Inst.) ; Sopicki, P. (Cracow, INP) ; South, D. (DESY) ; Spaskov, V. (Dubna, JINR) ; Specka, A. (Ecole Polytechnique) ; Steder, M. (DESY) ; Stella, B. (INFN, Rome) ; Straumann, U. (Zurich U.) ; Sykora, T. (Charles U.) ; Thompson, P.D. (Birmingham U.) ; Traynor, D. (Queen Mary, U. of London) ; Truol, P. (Zurich U.) ; Tsakov, I. (Sofiya, Inst. Nucl. Res.) ; Tseepeldorj, B. (Ulaanbaatar U.) ; Turnau, J. (Cracow, INP) ; Valkarova, A. (Charles U.) ; Vallee, C. (Marseille, CPPM) ; Van Mechelen, P. (Antwerp U., WISINF) ; Vazdik, Y. (Lebedev Inst.) ; Wegener, D. (Tech. U., Dortmund) ; Wunsch, E. (DESY) ; Zacek, J. (Charles U.) ; Zhang, Z. (Orsay) ; Zlebcik, R. (Charles U.) ; Zohrabyan, H. (Yerevan Phys. Inst.) ; Zomer, F. (Orsay)

Pages: 30

Abstract: 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 $131 \mathrm{pb}^{-1}$. 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 $6<Q^2<100$ GeV$^2$, 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.

Web-Page: http://inspirehep.net/record/1288065/files/desy-14-035_fig10a.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig10b.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig1a.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig1b.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig2a.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig2b.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig3a.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig3b.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig4a.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig4b.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig4c.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig5a.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig5b.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig5c.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig5d.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig5e.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig5f.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig6a.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig6b.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig6c.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig7a.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig7b.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig7c.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig7d.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig7e.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig7f.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig8a.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig8b.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig9a.png; http://inspirehep.net/record/1288065/files/desy-14-035_fig9b.png; http://inspirehep.net/record/1288065/files/arXiv:1404.0201.pdf

Note: *Temporary entry*; 30 pages, 5 tables, 10 figures, submitted to EPJC

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