par Adloff, Catherine;Clerbaux, Barbara ;Collard, Caroline ;Favart, Laurent ;Janssen, Xavier ;Marage, Pierre ; [et al.]
Référence Physics letters. Section B, 467, 1-2, page (156-164)
Publication Publié, 1999
Article révisé par les pairs
Résumé : The first observation of open b production in ep collisions is reported. An event sample containing muons and jets has been selected which is enriched in semileptonic b quark decays. The visible cross section σ(ep → bb̄X → μX′) for Q2 < 1 GeV2, 0.1 < y < 0.8 is measured to be 0.176 ± 0.016(stat.)-0.017+0.026 (syst.)nb for the muons to be detected in the range 35° < θμ < 130° and p⊥μ > 2.0 GeV in the laboratory frame. The expected visible cross section based on a NLO QCD calculation is 0.104 ± 0.017 nb. The cross sections for electroproduction with Q2 < 1 GeV2 and photoproduction are derived from the data and found to be σ(ep → ebb̄X) = 7.1 ± 0.6(stat.)-1.3+1.5(syst.) nb and σ(γp → bb̄X) = 111 ± 10(stat.)-20+23 (syst.)nb at an average 〈Wγp〉 ∼ 180 GeV, respectively. © 1999 Published by Elsevier Science B.V. All rights reserved.