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Measurement of open beauty production in photoproduction at HERA

Breitweg et al, J.

The European physical journal. C, Particles and fields, 2001-01, Vol.18 (4), p.625-637 [Periódico revisado por pares]

Heidelberg: Springer Nature B.V

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  • Título:
    Measurement of open beauty production in photoproduction at HERA
  • Autor: Breitweg et al, J.
  • Assuntos: Computer simulation ; Cross-sections ; Energy dissipation ; Energy measurement ; Luminosity ; Monte Carlo simulation ; Partons ; Photons ; Photoproduction ; Quarks ; Subtraction ; Transverse momentum
  • É parte de: The European physical journal. C, Particles and fields, 2001-01, Vol.18 (4), p.625-637
  • Descrição: The production and semi-leptonic decay of heavy quarks have been studied in the photoproduction process \(e^+p \rightarrow e^+ + \mbox{dijet} + e^- + X\) with the ZEUS detector at HERA using an integrated luminosity of 38.5 pb\(^{-1}}\). Events with photon-proton centre-of-mass energies, \(W_{\gamma p}\), between 134 and 269 GeV and a photon virtuality, \(Q^2\), less than 1 GeV\(^2\) were selected requiring at least two jets of transverse energy \(E_T^{\rm jet1(2)} >7(6)\) GeV and an electron in the final state. The electrons were identified by employing the ionisation energy loss measurement. The contribution of beauty quarks was determined using the transverse momentum of the electron relative to the axis of the closest jet, \(p_T^{\rm rel}\). The data, after background subtraction, were fit with a Monte Carlo simulation including beauty and charm decays. The measured beauty cross section was extrapolated to the parton level with the b quark restricted to the region of transverse momentum \(p_T^{b} > p_T^{\rm min} =\) 5 GeV and pseudorapidity \(|\eta^{b}| <\) 2. The extrapolated cross section is \(1.6 \pm 0.4 (stat.)^{+0.3}_{-0.5} (syst.) ^{+0.2}_{-0.4} (ext.) \mbox{nb}\). The result is compared to a perturbative QCD calculation performed to next-to-leading order.
  • Editor: Heidelberg: Springer Nature B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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