Reconstruction References

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Manuals and Software Info

  1. PYTHIA 6.4 Physics and Manual A description of Pythia used in bggen hadronic background simulation.
  2. The FIT-pull Method Describes the meaning of pulls fairly well.
  3. GlueX-doc-906 Two-gamma Kinematic Fitting (Mihajlo Kornicer)
  4. GlueX-doc-839 Probabilistic Event Weighting to Separate Signal from Background (Mike Williams, Matt Bellis and Curtis A. Meyer)

Journal Articles

  1. Simultaneous Photoproduction of eta and pi0 Mesons on the Proton, PRL 100, 052003 (2008) DOI:10.1103/PhysRevLett.100.052003
    • Pertinence:
    • Abstract: The analysis of the γp → η π0 p reaction has been performed using data from the GRAAL experiment. The total and differential cross sections and the beam asymmetry have been obtained from threshold up to 1.5 GeV of beam energy. The two resonances S11(1535) and Δ(1700) are expected to be excited in the intermediate states of this reaction. The results are used to test predictions based on the assumption that both resonances are dynamically generated from the meson-baryon interaction provided by chiral Lagrangians. The term involving the Δ(1700) excitation, followed by the decay into ηΔ(1232), is found to be dominant.
  2. Charge-exchange photoproduction of the a2-(1320) in association with Δ++ at 19.3 GeV/c, Phys. Rev. D 41, 3317 - 3323 (1990)
    • Pertinence: negatively charged a2 photoproduction cross section; relevant for our initial assumptions
    • Abstract: We examine the negative 3π final state produced in association with Δ++(1232) in the reaction γp→Δ++π+π-π- at an incident photon energy of 19.3 GeV. The most prominent enhancement in the 3π spectrum occurs at a mass and with a width consistent with the parameters of the a2(1320). This identification is confirmed by the various angular distributions. The a2 production cross section, corrected for efficiencies and alternate a2 decay modes, is 0.45±0.05 μb.
  3. Photoproduction of an isovector ρπ state at 1775 MeV, Phys. Rev. D 43, 2787 - 2791 (1991)
    • Pertinence:
    • Abstract: Evidence is presented for the charge-exchange photoproduction, in two distinct reactions, of an isovector ρπ state of mass ∼1775 MeV. Results of an analysis of the decay-angular distributions are also presented, from which it is concluded that JP=1-, 2-, or 3+.
  4. Photoproduction of π+π−π0 on hydrogen with linearly polarized photons of energy 20–70 GeV, Nuclear Physics B, Volume 231, Issue 1, 2 January 1984, Pages 15-39
    • Pertinence:
    • Abstract: Results on photoproduction of π+π−π0 in the photon energy range 20–70 GeV are presented. For the ω meson, the production cross-section is found to be 1010±15 (statistical)±290 (systematic) nb and is constant over the incident photon energy range. Spin-density matrix elements are evaluated for ω meson production. The φ meson is observed with a total photoproduction cross section (corrected for branching ratio to π+π−π0) of 610±35±170 nb. A third resonance, at 1.67 GeV, is seen in the mass spectrum and its interpretation is discussed. The production of a broad π+π−π0 continuum, mainly via varrhoπ, and peaking at 1.2 GeV, contributes with a cross section of about 2.5 ωb. The spin-parity content is analysed by the moments of the π+π−π0 decay angular distribution in the helicity frame and by maximum likelihood fits to the π+π−π0 Dalitz plot. It is found that production of JP = 1− states accounts for less than half of the total mass spectrum above 900 MeV. There is a broad enhancement in the 1+ wave around 1.15 GeV indicating photoproduction of the H(1190) meson.
  5. Photoproduction of the A2 Meson in the Reaction γp→nπ+π+π- and an Estimate of the A2 γπ Width, Phys. Rev. Lett. 23, 1322 - 1324 (1969)
    • Pertinence: irrelevant for Blake's work since we are looking to the ηπ channel and this a2 decay channel is at the level of 6x10-3.
    • Abstract: We observe production of the A2 meson in the reaction γp→nπ+π+π- at 4.3 and 5.25 GeV. The data are consistent with a one-pion-exchange production mechanism and we give an estimate of Γ(A2→γπ)≈0.5 MeV. A similar value for Γ(A2→γπ) is also obtained using a vector dominance model.
  6. Further results from charge-exchange photoproduction, Phys. Rev. D 48, 3045 - 3047 (1993)
    • Pertinence:
    • Abstract: It is shown that the energy dependence of charge-exchange a2+ photoproduction (γp→na2+) agrees with a one-pion exchange mechanism. No evidence for the photoproduction of the a1+(1260) is observed. If the dynamics of a1 and a2 photoproduction are assumed to be the same, the absence of evidence for the a1 is shown to be consistent with either an extremely large a1 hadronic width or with an a1 of mass somewhat less than 1260 MeV.