Measurement of Open Beauty Production at HERA

Details Measurement of Open Beauty Production at HERA Measurement of Open Beauty Production at HERA

1999-09-15

arxiv.org/abs/hep-ex/9909029v1

Phys.Lett.B467:156-164,1999; Erratum-ibid.B518:331-332,2001

Physics

High Energy Physics

High Energy Physics - Experiment

11 pages, 4 figures, 0 tables, submitted to Physics Letters B

Scientific paper

10.1016/S0370-2693(99)01099-0

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 \sigma(ep -> b \bar{b}X -> \mu X') for Q^2 < 1 GeV^2, 0.1 < y < 0.8 is measured to be 0.176+-0.016(stat.)+0.026-0.017(syst.) nb for the muons to be detected in the range 35 deg < \theta^\mu < 130 deg and \pt^\mu > 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 Q^2<1 GeV^2 and photoproduction are derived from the data and found to be \sigma(ep-> e b\bar{b}X) = 7.1+-0.6(stat.)+1.5-1.3(syst.) nb and \sigma(\gamma p-> b\bar{b} X) = 111+-10(stat.)+23-20(syst.) at an average \sim 180 GeV, respectively.

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