298 articles – 2332 Notices  [english version]
 HAL : in2p3-00192793, version 1
 arXiv : 0711.4578
 European Physical Journal C 54 (2008) 371-387
 Measurement of Isolated Photon Production in Deep-Inelastic Scattering at HERA
 H1 Collaboration(s)
 (2008)
 The production of isolated photons in deep-inelastic scattering $ep\to e \gamma X$ is measured with the H1 detector at HERA. The measurement is performed in the kinematic range of negative four-momentum transfer squared $450$ GeV. The analysis is based on a total integrated luminosity of 227~pb$^{-1}$. The production cross section of isolatedphotons with a transverse energy in the range $3 < E_T^\gamma < 10$ GeV and pseudorapidity range $-1.2 < \eta^\gamma < 1.8$ is measured as a function of $E_T^\gamma$, $\eta^\gamma$ and $Q^2$. Isolated photon cross sections are also measured for events with no jets or at least one hadronic jet. The measurements are compared with predictions from Monte Carlo generators modelling the photon radiation from the quark and the electron lines, as well as with calculations at leading and next to leading order in the strong coupling. The predictions significantly underestimate the measured cross sections.
 Thème(s) : Physique/Physique des Hautes Energies - Expérience
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0711.4578
 in2p3-00192793, version 1 http://hal.in2p3.fr/in2p3-00192793 oai:hal.in2p3.fr:in2p3-00192793 Contributeur : Dominique Girod <> Soumis le : Jeudi 29 Novembre 2007, 13:55:37 Dernière modification le : Lundi 7 Avril 2008, 16:41:08