Single photoproduction of neutral π-mesons on hydrogen in the extreme forward direction at 4 and 5.8 GeV

Braunschweig, M.; Braunschweig, W.; Husmann, D.; Lübelsmeyer, K.; Schmitz, D.

doi:10.1016/0550-3213(70)90202-6

Cited by 39 publications

(41 citation statements)

References 5 publications

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“…[34]. In contrast with our previous work for η photoproduction [26], the b 1 meson exchange was neglected in the present analysis since we found that its contribution is very small and cannot be unambiguously separated from the other terms with the limited amount of forward-angle data available.…”

Section: Introductionmentioning

confidence: 51%

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Nuclear incoherent photoproduction ofπ0andηfrom 4 to 12 GeV

Rodrigues¹,

Arruda‐Neto²,

Mesa³

et al. 2010

Phys. Rev. C

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The mechanism of incoherent π 0 and η photoproduction from complex nuclei is investigated from 4 to 12 GeV with an extended version of the multicollisional Monte Carlo (MCMC) intranuclear cascade model. The calculations take into account the elementary photoproduction amplitudes via a Regge model and the nuclear effects of photon shadowing, Pauli blocking, and meson-nucleus final-state interactions. The results for π 0 photoproduction reproduced for the first time the magnitude and energy dependence of the measured rations σ γ A /σ γ N for several nuclei (Be, C, Al, Cu, Ag, and Pb) from a Cornell experiment. The results for η photoproduction fitted the inelastic background in Cornell's yields remarkably well, which is clearly not isotropic as previously considered in Cornell's analysis. With this constraint for the background, the η → γ γ decay width was extracted using the Primakoff method, combining Be and Cu data [ η→γ γ = 0.476 (62)

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Section: Introductionmentioning

confidence: 51%

“…The natural-parity exchange amplitudes F 1 and F 3 are then calculated in terms of pole and cut contributions [34]:…”

Section: Introductionmentioning

confidence: 99%

Nuclear incoherent photoproduction ofπ0andηfrom 4 to 12 GeV

Rodrigues¹,

Arruda‐Neto²,

Mesa³

et al. 2010

Phys. Rev. C

View full text Add to dashboard Cite

show abstract

“…This model also takes into account an effective trajectory cut generated by elastic rescattering on the nucleon. This cut is parameterized by πN elastic scattering, instead of just being an effective trajectory cut as in [24]. Brasse et al [31] and Berger et al [32] measured π 0 electroproduction cross section at very low Q 2 (below 1 GeV 2 ) in order to make the connection with π 0 photoproduction.…”

Section: Old Neutral Pion Results and Regge Interpretationmentioning

confidence: 99%

“…The contribution of the ρ has been quickly minimized because of the very weak ρ → π 0 γ branching ratio. Braunschweig et al in [23,24] fitted their photoproduction data at 4 and 5.8 GeV photon energy. Their fit includes Primakoff effect, which is the production of a neutral pion by the interaction of the real photon with a virtual photon from the target (γγ * → π 0 ).…”

Section: Old Neutral Pion Results and Regge Interpretationmentioning

confidence: 99%