The production of photons at very small angles with respect to the proton beam direction is studied in deep-inelastic positron–proton scattering at HERA. The data are taken with the H1 detector in the years 2006 and 2007 and correspond to an integrated luminosity of 126 pb−1. The analysis covers the range of negative four momentum transfer squared at the positron vertex 6<Q 2<100 GeV2 and inelasticity 0.05<y<0.6. Cross sections are measured for the most energetic photon with pseudorapidity η>7.9

as a function of its transverse momentum pTlead and longitudinal momentum fraction of the incoming proton xLlead. In addition, the cross sections are studied as a function of the sum of the longitudinal momentum fraction xLsum of all photons in the pseudorapidity range η>7.9. The cross sections are normalised to the inclusive deep-inelastic scattering cross section and compared to the predictions of models of deep-inelastic scattering and models of the hadronic interactions of high energy cosmic rays.

H1 Collaboration; Aaron, F D; Alexa, C; Andreev, V; Müller, K; Robmann, P; Straumann, U; Truöl, P (2011). *Measurement of photon production in the very forward direction in deep-inelastic scattering at HERA.* European Physical Journal C - Particles and Fields, 71(10):1771.

## Abstract

The production of photons at very small angles with respect to the proton beam direction is studied in deep-inelastic positron–proton scattering at HERA. The data are taken with the H1 detector in the years 2006 and 2007 and correspond to an integrated luminosity of 126 pb−1. The analysis covers the range of negative four momentum transfer squared at the positron vertex 6<Q 2<100 GeV2 and inelasticity 0.05<y<0.6. Cross sections are measured for the most energetic photon with pseudorapidity η>7.9

as a function of its transverse momentum pTlead and longitudinal momentum fraction of the incoming proton xLlead. In addition, the cross sections are studied as a function of the sum of the longitudinal momentum fraction xLsum of all photons in the pseudorapidity range η>7.9. The cross sections are normalised to the inclusive deep-inelastic scattering cross section and compared to the predictions of models of deep-inelastic scattering and models of the hadronic interactions of high energy cosmic rays.

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## Additional indexing

Item Type: | Journal Article, refereed, original work |
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Communities & Collections: | 07 Faculty of Science > Physics Institute |

Dewey Decimal Classification: | 530 Physics |

Language: | English |

Date: | 2011 |

Deposited On: | 12 Feb 2012 14:05 |

Last Modified: | 05 Apr 2016 15:34 |

Publisher: | Springer |

ISSN: | 1434-6044 (P) 1434-6052 (E) |

Additional Information: | The original publication is available at www.springerlink.com |

Publisher DOI: | 10.1140/epjc/s10052-011-1771-6 |

Related URLs: | http://arxiv.org/abs/1106.5944 |

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