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European Physical Journal C: Particles and Fields 72 (2012) 2148
Measurement of Beauty Photoproduction near Threshold using Di-electron Events with the H1 Detector at HERA
F.D. Aaron, E. Barrelet1, J.C. Bizot2, V. Boudry3, V. Brisson2, B. Delcourt2, C. Diaconu4, J. Feltesse5, M. Gouzevitch6, M. Jacquet2, F. Moreau3, C. Pascaud2, E. Perez5, E. Sauvan4, L. Schoeffel5, A. Specka3, T.H. Tran2, C. Vallée4, Z. Zhang2, F. Zomer2, D. Hoffmann4
For the H1 collaboration(s)
(2012)

The cross section for ep -> e b\bar{b} X in photoproduction is measured with the H1 detector at the ep-collider HERA. The decay channel b\bar{b} -> ee X' is selected by identifying the semi-electronic decays of the b-quarks. The total production cross section is measured in the kinematic range given by the photon virtuality Q^2 <= 1 GeV^2, the inelasticity 0.05 <= y <= 0.65 and the pseudorapidity of the b-quarks |eta(b)|,|eta(\bar{b})| <= 2. The differential production cross section is measured as a function of the average transverse momentum of the beauty quarks down to the threshold. The results are compared to next-to-leading-order QCD predictions.
1:  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
2:  LAL - Laboratoire de l'Accélérateur Linéaire
3:  LLR - Laboratoire Leprince-Ringuet
4:  CPPM - Centre de Physique des Particules de Marseille
5:  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
6:  IPNL - Institut de Physique Nucléaire de Lyon
Physics/High Energy Physics - Experiment
Fulltext link: 
http://fr.arXiv.org/abs/1206.4346