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Inclusive Measurement of Diffractive Deep-Inelastic Scattering at HERA
Aaron F.D., Bizot J.C., Brisson V., Delcourt B., Jacquet M. et al
European Physical Journal C: Particles and Fields 72 (2012) 2074 - http://hal.in2p3.fr/in2p3-00716968
Physique/Physique des Hautes Energies - Expérience
Inclusive Measurement of Diffractive Deep-Inelastic Scattering at HERA
F.D. Aaron, J.C. Bizot1, V. Brisson1, B. Delcourt1, M. Jacquet1, C. Pascaud1, T.H. Tran1, Z. Zhang1, F. Zomer1, E. Barrelet2, V. Boudry3, F. Moreau3, A. Specka3, M. Gouzevitch4, C. Diaconu5, D. Hoffmann5, E. Sauvan5, 6, C. Vallée5
1 :  LAL - Laboratoire de l'Accélérateur Linéaire
CNRS : UMR8607 – IN2P3 – Université Paris XI - Paris Sud
Centre Scientifique d'Orsay B.P. 34 91898 ORSAY Cedex
2 :  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
CNRS : UMR7585 – IN2P3 – Université Pierre et Marie Curie (UPMC) - Paris VI – Université Paris VII - Paris Diderot
Barre 12-22, 1er étage 4 Place Jussieu 75252 Paris Cedex 05
3 :  LLR - Laboratoire Leprince-Ringuet
CNRS : UMR7638 – IN2P3 – Polytechnique - X
Route de Saclay - 91128 Palaiseau Cedex
4 :  IPNL - Institut de Physique Nucléaire de Lyon
CNRS : UMR5822 – IN2P3 – Université Claude Bernard - Lyon I
5 :  CPPM - Centre de Physique des Particules de Marseille
CNRS : UMR7346 – IN2P3 – Université de la Méditerranée - Aix-Marseille II
163, avenue de Luminy - Case 902 - 13288 Marseille cedex 09
6 :  LAPP - Laboratoire d'Annecy le Vieux de Physique des Particules
CNRS : UMR5814 – IN2P3 – Université de Savoie
9 Chemin de Bellevue - BP 110 - 74941 Annecy-le-Vieux CEDEX - France
The diffractive process ep \rightarrow eXY, where Y denotes a proton or its low mass excitation with MY < 1.6 GeV, is studied with the H1 experiment at HERA. The analysis is restricted to the phase space region of the photon virtuality 3 \leq Q2 \leq 1600 GeV2, the square of the four-momentum transfer at the proton vertex |t| < 1.0 GeV2 and the longitudinal momentum fraction of the incident proton carried by the colourless exchange xIP < 0.05. Triple differential cross sections are measured as a function of xIP, Q2 and beta = x/xIP where x is the Bjorken scaling variable. These measurements are made after selecting diffractive events by demanding a large empty rapidity interval separating the final state hadronic systems X and Y . High statistics measurements covering the data taking periods 1999-2000 and 2004-2007 are combined with previously published results in order to provide a single set of diffractive cross sections from the H1 experiment using the large rapidity gap selection method. The combined data represent a factor between three and thirty increase in statistics with respect to the previously published results. The measurements are compared with predictions from NLO QCD calculations based on diffractive parton densities and from a dipole model. The proton vertex factorisation hypothesis is tested.

Articles dans des revues avec comité de lecture
European Physical Journal C: Particles and Fields (Eur. Phys. J. C)
Publisher EDP Sciences: EPJ
ISSN 1434-6044 (eISSN : 1434-6052)

36 pages, 7 tables, 12 figures, Submitted to EPJC - See paper for full list of authors
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